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<li class="pinned-header">Node.js v22.13.1</li>
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Table of contents
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<div class="picker"><div class="toc"><ul>
<li><a href="#global-objects">Global objects</a>
<ul>
<li><a href="#class-abortcontroller">Class: <code>AbortController</code></a>
<ul>
<li><a href="#abortcontrollerabortreason"><code>abortController.abort([reason])</code></a></li>
<li><a href="#abortcontrollersignal"><code>abortController.signal</code></a></li>
<li><a href="#class-abortsignal">Class: <code>AbortSignal</code></a>
<ul>
<li><a href="#static-method-abortsignalabortreason">Static method: <code>AbortSignal.abort([reason])</code></a></li>
<li><a href="#static-method-abortsignaltimeoutdelay">Static method: <code>AbortSignal.timeout(delay)</code></a></li>
<li><a href="#static-method-abortsignalanysignals">Static method: <code>AbortSignal.any(signals)</code></a></li>
<li><a href="#event-abort">Event: <code>'abort'</code></a></li>
<li><a href="#abortsignalaborted"><code>abortSignal.aborted</code></a></li>
<li><a href="#abortsignalonabort"><code>abortSignal.onabort</code></a></li>
<li><a href="#abortsignalreason"><code>abortSignal.reason</code></a></li>
<li><a href="#abortsignalthrowifaborted"><code>abortSignal.throwIfAborted()</code></a></li>
</ul>
</li>
</ul>
</li>
<li><a href="#class-blob">Class: <code>Blob</code></a></li>
<li><a href="#class-buffer">Class: <code>Buffer</code></a></li>
<li><span class="stability_1"><a href="#class-bytelengthqueuingstrategy">Class: <code>ByteLengthQueuingStrategy</code></a></span></li>
<li><a href="#__dirname"><code>__dirname</code></a></li>
<li><a href="#__filename"><code>__filename</code></a></li>
<li><span class="stability_3"><a href="#atobdata"><code>atob(data)</code></a></span></li>
<li><a href="#broadcastchannel"><code>BroadcastChannel</code></a></li>
<li><span class="stability_3"><a href="#btoadata"><code>btoa(data)</code></a></span></li>
<li><a href="#clearimmediateimmediateobject"><code>clearImmediate(immediateObject)</code></a></li>
<li><a href="#clearintervalintervalobject"><code>clearInterval(intervalObject)</code></a></li>
<li><a href="#cleartimeouttimeoutobject"><code>clearTimeout(timeoutObject)</code></a></li>
<li><span class="stability_1"><a href="#class-compressionstream">Class: <code>CompressionStream</code></a></span></li>
<li><a href="#console"><code>console</code></a></li>
<li><span class="stability_1"><a href="#class-countqueuingstrategy">Class: <code>CountQueuingStrategy</code></a></span></li>
<li><span class="stability_1"><a href="#crypto"><code>Crypto</code></a></span></li>
<li><span class="stability_1"><a href="#crypto_1"><code>crypto</code></a></span></li>
<li><span class="stability_1"><a href="#cryptokey"><code>CryptoKey</code></a></span></li>
<li><span class="stability_2"><a href="#customevent"><code>CustomEvent</code></a></span></li>
<li><span class="stability_1"><a href="#class-decompressionstream">Class: <code>DecompressionStream</code></a></span></li>
<li><a href="#event"><code>Event</code></a></li>
<li><span class="stability_1"><a href="#eventsource"><code>EventSource</code></a></span></li>
<li><a href="#eventtarget"><code>EventTarget</code></a></li>
<li><a href="#exports"><code>exports</code></a></li>
<li><span class="stability_2"><a href="#fetch"><code>fetch</code></a></span></li>
<li><a href="#class-file">Class: <code>File</code></a></li>
<li><span class="stability_2"><a href="#class-formdata">Class <code>FormData</code></a></span></li>
<li><span class="stability_3"><a href="#global"><code>global</code></a></span></li>
<li><span class="stability_2"><a href="#class-headers">Class <code>Headers</code></a></span></li>
<li><span class="stability_1"><a href="#localstorage"><code>localStorage</code></a></span></li>
<li><a href="#messagechannel"><code>MessageChannel</code></a></li>
<li><a href="#messageevent"><code>MessageEvent</code></a></li>
<li><a href="#messageport"><code>MessagePort</code></a></li>
<li><a href="#module"><code>module</code></a></li>
<li><span class="stability_1"><a href="#navigator"><code>Navigator</code></a></span></li>
<li><span class="stability_1"><a href="#navigator_1"><code>navigator</code></a></span>
<ul>
<li><a href="#navigatorhardwareconcurrency"><code>navigator.hardwareConcurrency</code></a></li>
<li><a href="#navigatorlanguage"><code>navigator.language</code></a></li>
<li><a href="#navigatorlanguages"><code>navigator.languages</code></a></li>
<li><a href="#navigatorplatform"><code>navigator.platform</code></a></li>
<li><a href="#navigatoruseragent"><code>navigator.userAgent</code></a></li>
</ul>
</li>
<li><a href="#performanceentry"><code>PerformanceEntry</code></a></li>
<li><a href="#performancemark"><code>PerformanceMark</code></a></li>
<li><a href="#performancemeasure"><code>PerformanceMeasure</code></a></li>
<li><a href="#performanceobserver"><code>PerformanceObserver</code></a></li>
<li><a href="#performanceobserverentrylist"><code>PerformanceObserverEntryList</code></a></li>
<li><a href="#performanceresourcetiming"><code>PerformanceResourceTiming</code></a></li>
<li><a href="#performance"><code>performance</code></a></li>
<li><a href="#process"><code>process</code></a></li>
<li><a href="#queuemicrotaskcallback"><code>queueMicrotask(callback)</code></a></li>
<li><span class="stability_1"><a href="#class-readablebytestreamcontroller">Class: <code>ReadableByteStreamController</code></a></span></li>
<li><span class="stability_1"><a href="#class-readablestream">Class: <code>ReadableStream</code></a></span></li>
<li><span class="stability_1"><a href="#class-readablestreambyobreader">Class: <code>ReadableStreamBYOBReader</code></a></span></li>
<li><span class="stability_1"><a href="#class-readablestreambyobrequest">Class: <code>ReadableStreamBYOBRequest</code></a></span></li>
<li><span class="stability_1"><a href="#class-readablestreamdefaultcontroller">Class: <code>ReadableStreamDefaultController</code></a></span></li>
<li><span class="stability_1"><a href="#class-readablestreamdefaultreader">Class: <code>ReadableStreamDefaultReader</code></a></span></li>
<li><a href="#require"><code>require()</code></a></li>
<li><span class="stability_2"><a href="#response"><code>Response</code></a></span></li>
<li><span class="stability_2"><a href="#request"><code>Request</code></a></span></li>
<li><span class="stability_1"><a href="#sessionstorage"><code>sessionStorage</code></a></span></li>
<li><a href="#setimmediatecallback-args"><code>setImmediate(callback[, ...args])</code></a></li>
<li><a href="#setintervalcallback-delay-args"><code>setInterval(callback, delay[, ...args])</code></a></li>
<li><a href="#settimeoutcallback-delay-args"><code>setTimeout(callback, delay[, ...args])</code></a></li>
<li><span class="stability_1"><a href="#class-storage">Class: <code>Storage</code></a></span></li>
<li><a href="#structuredclonevalue-options"><code>structuredClone(value[, options])</code></a></li>
<li><span class="stability_1"><a href="#subtlecrypto"><code>SubtleCrypto</code></a></span></li>
<li><a href="#domexception"><code>DOMException</code></a></li>
<li><a href="#textdecoder"><code>TextDecoder</code></a></li>
<li><span class="stability_1"><a href="#class-textdecoderstream">Class: <code>TextDecoderStream</code></a></span></li>
<li><a href="#textencoder"><code>TextEncoder</code></a></li>
<li><span class="stability_1"><a href="#class-textencoderstream">Class: <code>TextEncoderStream</code></a></span></li>
<li><span class="stability_1"><a href="#class-transformstream">Class: <code>TransformStream</code></a></span></li>
<li><span class="stability_1"><a href="#class-transformstreamdefaultcontroller">Class: <code>TransformStreamDefaultController</code></a></span></li>
<li><a href="#url"><code>URL</code></a></li>
<li><a href="#urlsearchparams"><code>URLSearchParams</code></a></li>
<li><a href="#webassembly"><code>WebAssembly</code></a></li>
<li><span class="stability_2"><a href="#websocket"><code>WebSocket</code></a></span></li>
<li><span class="stability_1"><a href="#class-writablestream">Class: <code>WritableStream</code></a></span></li>
<li><span class="stability_1"><a href="#class-writablestreamdefaultcontroller">Class: <code>WritableStreamDefaultController</code></a></span></li>
<li><span class="stability_1"><a href="#class-writablestreamdefaultwriter">Class: <code>WritableStreamDefaultWriter</code></a></span></li>
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<hr>
</header>
<details role="navigation" id="toc" open><summary>Table of contents</summary><ul>
<li><a href="#global-objects">Global objects</a>
<ul>
<li><a href="#class-abortcontroller">Class: <code>AbortController</code></a>
<ul>
<li><a href="#abortcontrollerabortreason"><code>abortController.abort([reason])</code></a></li>
<li><a href="#abortcontrollersignal"><code>abortController.signal</code></a></li>
<li><a href="#class-abortsignal">Class: <code>AbortSignal</code></a>
<ul>
<li><a href="#static-method-abortsignalabortreason">Static method: <code>AbortSignal.abort([reason])</code></a></li>
<li><a href="#static-method-abortsignaltimeoutdelay">Static method: <code>AbortSignal.timeout(delay)</code></a></li>
<li><a href="#static-method-abortsignalanysignals">Static method: <code>AbortSignal.any(signals)</code></a></li>
<li><a href="#event-abort">Event: <code>'abort'</code></a></li>
<li><a href="#abortsignalaborted"><code>abortSignal.aborted</code></a></li>
<li><a href="#abortsignalonabort"><code>abortSignal.onabort</code></a></li>
<li><a href="#abortsignalreason"><code>abortSignal.reason</code></a></li>
<li><a href="#abortsignalthrowifaborted"><code>abortSignal.throwIfAborted()</code></a></li>
</ul>
</li>
</ul>
</li>
<li><a href="#class-blob">Class: <code>Blob</code></a></li>
<li><a href="#class-buffer">Class: <code>Buffer</code></a></li>
<li><span class="stability_1"><a href="#class-bytelengthqueuingstrategy">Class: <code>ByteLengthQueuingStrategy</code></a></span></li>
<li><a href="#__dirname"><code>__dirname</code></a></li>
<li><a href="#__filename"><code>__filename</code></a></li>
<li><span class="stability_3"><a href="#atobdata"><code>atob(data)</code></a></span></li>
<li><a href="#broadcastchannel"><code>BroadcastChannel</code></a></li>
<li><span class="stability_3"><a href="#btoadata"><code>btoa(data)</code></a></span></li>
<li><a href="#clearimmediateimmediateobject"><code>clearImmediate(immediateObject)</code></a></li>
<li><a href="#clearintervalintervalobject"><code>clearInterval(intervalObject)</code></a></li>
<li><a href="#cleartimeouttimeoutobject"><code>clearTimeout(timeoutObject)</code></a></li>
<li><span class="stability_1"><a href="#class-compressionstream">Class: <code>CompressionStream</code></a></span></li>
<li><a href="#console"><code>console</code></a></li>
<li><span class="stability_1"><a href="#class-countqueuingstrategy">Class: <code>CountQueuingStrategy</code></a></span></li>
<li><span class="stability_1"><a href="#crypto"><code>Crypto</code></a></span></li>
<li><span class="stability_1"><a href="#crypto_1"><code>crypto</code></a></span></li>
<li><span class="stability_1"><a href="#cryptokey"><code>CryptoKey</code></a></span></li>
<li><span class="stability_2"><a href="#customevent"><code>CustomEvent</code></a></span></li>
<li><span class="stability_1"><a href="#class-decompressionstream">Class: <code>DecompressionStream</code></a></span></li>
<li><a href="#event"><code>Event</code></a></li>
<li><span class="stability_1"><a href="#eventsource"><code>EventSource</code></a></span></li>
<li><a href="#eventtarget"><code>EventTarget</code></a></li>
<li><a href="#exports"><code>exports</code></a></li>
<li><span class="stability_2"><a href="#fetch"><code>fetch</code></a></span></li>
<li><a href="#class-file">Class: <code>File</code></a></li>
<li><span class="stability_2"><a href="#class-formdata">Class <code>FormData</code></a></span></li>
<li><span class="stability_3"><a href="#global"><code>global</code></a></span></li>
<li><span class="stability_2"><a href="#class-headers">Class <code>Headers</code></a></span></li>
<li><span class="stability_1"><a href="#localstorage"><code>localStorage</code></a></span></li>
<li><a href="#messagechannel"><code>MessageChannel</code></a></li>
<li><a href="#messageevent"><code>MessageEvent</code></a></li>
<li><a href="#messageport"><code>MessagePort</code></a></li>
<li><a href="#module"><code>module</code></a></li>
<li><span class="stability_1"><a href="#navigator"><code>Navigator</code></a></span></li>
<li><span class="stability_1"><a href="#navigator_1"><code>navigator</code></a></span>
<ul>
<li><a href="#navigatorhardwareconcurrency"><code>navigator.hardwareConcurrency</code></a></li>
<li><a href="#navigatorlanguage"><code>navigator.language</code></a></li>
<li><a href="#navigatorlanguages"><code>navigator.languages</code></a></li>
<li><a href="#navigatorplatform"><code>navigator.platform</code></a></li>
<li><a href="#navigatoruseragent"><code>navigator.userAgent</code></a></li>
</ul>
</li>
<li><a href="#performanceentry"><code>PerformanceEntry</code></a></li>
<li><a href="#performancemark"><code>PerformanceMark</code></a></li>
<li><a href="#performancemeasure"><code>PerformanceMeasure</code></a></li>
<li><a href="#performanceobserver"><code>PerformanceObserver</code></a></li>
<li><a href="#performanceobserverentrylist"><code>PerformanceObserverEntryList</code></a></li>
<li><a href="#performanceresourcetiming"><code>PerformanceResourceTiming</code></a></li>
<li><a href="#performance"><code>performance</code></a></li>
<li><a href="#process"><code>process</code></a></li>
<li><a href="#queuemicrotaskcallback"><code>queueMicrotask(callback)</code></a></li>
<li><span class="stability_1"><a href="#class-readablebytestreamcontroller">Class: <code>ReadableByteStreamController</code></a></span></li>
<li><span class="stability_1"><a href="#class-readablestream">Class: <code>ReadableStream</code></a></span></li>
<li><span class="stability_1"><a href="#class-readablestreambyobreader">Class: <code>ReadableStreamBYOBReader</code></a></span></li>
<li><span class="stability_1"><a href="#class-readablestreambyobrequest">Class: <code>ReadableStreamBYOBRequest</code></a></span></li>
<li><span class="stability_1"><a href="#class-readablestreamdefaultcontroller">Class: <code>ReadableStreamDefaultController</code></a></span></li>
<li><span class="stability_1"><a href="#class-readablestreamdefaultreader">Class: <code>ReadableStreamDefaultReader</code></a></span></li>
<li><a href="#require"><code>require()</code></a></li>
<li><span class="stability_2"><a href="#response"><code>Response</code></a></span></li>
<li><span class="stability_2"><a href="#request"><code>Request</code></a></span></li>
<li><span class="stability_1"><a href="#sessionstorage"><code>sessionStorage</code></a></span></li>
<li><a href="#setimmediatecallback-args"><code>setImmediate(callback[, ...args])</code></a></li>
<li><a href="#setintervalcallback-delay-args"><code>setInterval(callback, delay[, ...args])</code></a></li>
<li><a href="#settimeoutcallback-delay-args"><code>setTimeout(callback, delay[, ...args])</code></a></li>
<li><span class="stability_1"><a href="#class-storage">Class: <code>Storage</code></a></span></li>
<li><a href="#structuredclonevalue-options"><code>structuredClone(value[, options])</code></a></li>
<li><span class="stability_1"><a href="#subtlecrypto"><code>SubtleCrypto</code></a></span></li>
<li><a href="#domexception"><code>DOMException</code></a></li>
<li><a href="#textdecoder"><code>TextDecoder</code></a></li>
<li><span class="stability_1"><a href="#class-textdecoderstream">Class: <code>TextDecoderStream</code></a></span></li>
<li><a href="#textencoder"><code>TextEncoder</code></a></li>
<li><span class="stability_1"><a href="#class-textencoderstream">Class: <code>TextEncoderStream</code></a></span></li>
<li><span class="stability_1"><a href="#class-transformstream">Class: <code>TransformStream</code></a></span></li>
<li><span class="stability_1"><a href="#class-transformstreamdefaultcontroller">Class: <code>TransformStreamDefaultController</code></a></span></li>
<li><a href="#url"><code>URL</code></a></li>
<li><a href="#urlsearchparams"><code>URLSearchParams</code></a></li>
<li><a href="#webassembly"><code>WebAssembly</code></a></li>
<li><span class="stability_2"><a href="#websocket"><code>WebSocket</code></a></span></li>
<li><span class="stability_1"><a href="#class-writablestream">Class: <code>WritableStream</code></a></span></li>
<li><span class="stability_1"><a href="#class-writablestreamdefaultcontroller">Class: <code>WritableStreamDefaultController</code></a></span></li>
<li><span class="stability_1"><a href="#class-writablestreamdefaultwriter">Class: <code>WritableStreamDefaultWriter</code></a></span></li>
</ul>
</li>
</ul></details>
<div role="main" id="apicontent">
<h2>Global objects<span><a class="mark" href="#global-objects" id="global-objects">#</a></span><a aria-hidden="true" class="legacy" id="globals_global_objects"></a></h2>
<p>These objects are available in all modules.</p>
<p>The following variables may appear to be global but are not. They exist only in
the scope of <a href="modules.html">CommonJS modules</a>:</p>
<ul>
<li><a href="modules.html#__dirname"><code>__dirname</code></a></li>
<li><a href="modules.html#__filename"><code>__filename</code></a></li>
<li><a href="modules.html#exports"><code>exports</code></a></li>
<li><a href="modules.html#module"><code>module</code></a></li>
<li><a href="modules.html#requireid"><code>require()</code></a></li>
</ul>
<p>The objects listed here are specific to Node.js. There are <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects">built-in objects</a>
that are part of the JavaScript language itself, which are also globally
accessible.</p>
<section><h3>Class: <code>AbortController</code><span><a class="mark" href="#class-abortcontroller" id="class-abortcontroller">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_abortcontroller"></a></h3>
<div class="api_metadata">
<details class="changelog"><summary>History</summary>
<table>
<tbody><tr><th>Version</th><th>Changes</th></tr>
<tr><td>v15.4.0</td>
<td><p>No longer experimental.</p></td></tr>
<tr><td>v15.0.0, v14.17.0</td>
<td><p><span>Added in: v15.0.0, v14.17.0</span></p></td></tr>
</tbody></table>
</details>
</div>
<p>A utility class used to signal cancelation in selected <code>Promise</code>-based APIs.
The API is based on the Web API <a href="https://developer.mozilla.org/en-US/docs/Web/API/AbortController"><code>AbortController</code></a>.</p>
<pre><code class="language-js"><span class="hljs-keyword">const</span> ac = <span class="hljs-keyword">new</span> <span class="hljs-title class_">AbortController</span>();
ac.<span class="hljs-property">signal</span>.<span class="hljs-title function_">addEventListener</span>(<span class="hljs-string">'abort'</span>, <span class="hljs-function">() =></span> <span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-string">'Aborted!'</span>),
{ <span class="hljs-attr">once</span>: <span class="hljs-literal">true</span> });
ac.<span class="hljs-title function_">abort</span>();
<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(ac.<span class="hljs-property">signal</span>.<span class="hljs-property">aborted</span>); <span class="hljs-comment">// Prints true</span></code> <button class="copy-button">copy</button></pre>
<h4><code>abortController.abort([reason])</code><span><a class="mark" href="#abortcontrollerabortreason" id="abortcontrollerabortreason">#</a></span><a aria-hidden="true" class="legacy" id="globals_abortcontroller_abort_reason"></a></h4>
<div class="api_metadata">
<details class="changelog"><summary>History</summary>
<table>
<tbody><tr><th>Version</th><th>Changes</th></tr>
<tr><td>v17.2.0, v16.14.0</td>
<td><p>Added the new optional reason argument.</p></td></tr>
<tr><td>v15.0.0, v14.17.0</td>
<td><p><span>Added in: v15.0.0, v14.17.0</span></p></td></tr>
</tbody></table>
</details>
</div>
<ul>
<li><code>reason</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Data_types" class="type"><any></a> An optional reason, retrievable on the <code>AbortSignal</code>'s
<code>reason</code> property.</li>
</ul>
<p>Triggers the abort signal, causing the <code>abortController.signal</code> to emit
the <code>'abort'</code> event.</p>
<h4><code>abortController.signal</code><span><a class="mark" href="#abortcontrollersignal" id="abortcontrollersignal">#</a></span><a aria-hidden="true" class="legacy" id="globals_abortcontroller_signal"></a></h4>
<div class="api_metadata">
<span>Added in: v15.0.0, v14.17.0</span>
</div>
<ul>
<li>Type: <a href="globals.html#class-abortsignal" class="type"><AbortSignal></a></li>
</ul>
<h4>Class: <code>AbortSignal</code><span><a class="mark" href="#class-abortsignal" id="class-abortsignal">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_abortsignal"></a></h4>
<div class="api_metadata">
<span>Added in: v15.0.0, v14.17.0</span>
</div>
<ul>
<li>Extends: <a href="events.html#class-eventtarget" class="type"><EventTarget></a></li>
</ul>
<p>The <code>AbortSignal</code> is used to notify observers when the
<code>abortController.abort()</code> method is called.</p>
<h5>Static method: <code>AbortSignal.abort([reason])</code><span><a class="mark" href="#static-method-abortsignalabortreason" id="static-method-abortsignalabortreason">#</a></span><a aria-hidden="true" class="legacy" id="globals_static_method_abortsignal_abort_reason"></a></h5>
<div class="api_metadata">
<details class="changelog"><summary>History</summary>
<table>
<tbody><tr><th>Version</th><th>Changes</th></tr>
<tr><td>v17.2.0, v16.14.0</td>
<td><p>Added the new optional reason argument.</p></td></tr>
<tr><td>v15.12.0, v14.17.0</td>
<td><p><span>Added in: v15.12.0, v14.17.0</span></p></td></tr>
</tbody></table>
</details>
</div>
<ul>
<li><code>reason</code>: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Data_types" class="type"><any></a></li>
<li>Returns: <a href="globals.html#class-abortsignal" class="type"><AbortSignal></a></li>
</ul>
<p>Returns a new already aborted <code>AbortSignal</code>.</p>
<h5>Static method: <code>AbortSignal.timeout(delay)</code><span><a class="mark" href="#static-method-abortsignaltimeoutdelay" id="static-method-abortsignaltimeoutdelay">#</a></span><a aria-hidden="true" class="legacy" id="globals_static_method_abortsignal_timeout_delay"></a></h5>
<div class="api_metadata">
<span>Added in: v17.3.0, v16.14.0</span>
</div>
<ul>
<li><code>delay</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type" class="type"><number></a> The number of milliseconds to wait before triggering
the AbortSignal.</li>
</ul>
<p>Returns a new <code>AbortSignal</code> which will be aborted in <code>delay</code> milliseconds.</p>
<h5>Static method: <code>AbortSignal.any(signals)</code><span><a class="mark" href="#static-method-abortsignalanysignals" id="static-method-abortsignalanysignals">#</a></span><a aria-hidden="true" class="legacy" id="globals_static_method_abortsignal_any_signals"></a></h5>
<div class="api_metadata">
<span>Added in: v20.3.0, v18.17.0</span>
</div>
<ul>
<li><code>signals</code> <a href="globals.html#class-abortsignal" class="type"><AbortSignal[]></a> The <code>AbortSignal</code>s of which to compose a new <code>AbortSignal</code>.</li>
</ul>
<p>Returns a new <code>AbortSignal</code> which will be aborted if any of the provided
signals are aborted. Its <a href="#abortsignalreason"><code>abortSignal.reason</code></a> will be set to whichever
one of the <code>signals</code> caused it to be aborted.</p>
<h5>Event: <code>'abort'</code><span><a class="mark" href="#event-abort" id="event-abort">#</a></span><a aria-hidden="true" class="legacy" id="globals_event_abort"></a></h5>
<div class="api_metadata">
<span>Added in: v15.0.0, v14.17.0</span>
</div>
<p>The <code>'abort'</code> event is emitted when the <code>abortController.abort()</code> method
is called. The callback is invoked with a single object argument with a
single <code>type</code> property set to <code>'abort'</code>:</p>
<pre><code class="language-js"><span class="hljs-keyword">const</span> ac = <span class="hljs-keyword">new</span> <span class="hljs-title class_">AbortController</span>();
<span class="hljs-comment">// Use either the onabort property...</span>
ac.<span class="hljs-property">signal</span>.<span class="hljs-property">onabort</span> = <span class="hljs-function">() =></span> <span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-string">'aborted!'</span>);
<span class="hljs-comment">// Or the EventTarget API...</span>
ac.<span class="hljs-property">signal</span>.<span class="hljs-title function_">addEventListener</span>(<span class="hljs-string">'abort'</span>, <span class="hljs-function">(<span class="hljs-params">event</span>) =></span> {
<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(event.<span class="hljs-property">type</span>); <span class="hljs-comment">// Prints 'abort'</span>
}, { <span class="hljs-attr">once</span>: <span class="hljs-literal">true</span> });
ac.<span class="hljs-title function_">abort</span>();</code> <button class="copy-button">copy</button></pre>
<p>The <code>AbortController</code> with which the <code>AbortSignal</code> is associated will only
ever trigger the <code>'abort'</code> event once. We recommended that code check
that the <code>abortSignal.aborted</code> attribute is <code>false</code> before adding an <code>'abort'</code>
event listener.</p>
<p>Any event listeners attached to the <code>AbortSignal</code> should use the
<code>{ once: true }</code> option (or, if using the <code>EventEmitter</code> APIs to attach a
listener, use the <code>once()</code> method) to ensure that the event listener is
removed as soon as the <code>'abort'</code> event is handled. Failure to do so may
result in memory leaks.</p>
<h5><code>abortSignal.aborted</code><span><a class="mark" href="#abortsignalaborted" id="abortsignalaborted">#</a></span><a aria-hidden="true" class="legacy" id="globals_abortsignal_aborted"></a></h5>
<div class="api_metadata">
<span>Added in: v15.0.0, v14.17.0</span>
</div>
<ul>
<li>Type: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type" class="type"><boolean></a> True after the <code>AbortController</code> has been aborted.</li>
</ul>
<h5><code>abortSignal.onabort</code><span><a class="mark" href="#abortsignalonabort" id="abortsignalonabort">#</a></span><a aria-hidden="true" class="legacy" id="globals_abortsignal_onabort"></a></h5>
<div class="api_metadata">
<span>Added in: v15.0.0, v14.17.0</span>
</div>
<ul>
<li>Type: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function" class="type"><Function></a></li>
</ul>
<p>An optional callback function that may be set by user code to be notified
when the <code>abortController.abort()</code> function has been called.</p>
<h5><code>abortSignal.reason</code><span><a class="mark" href="#abortsignalreason" id="abortsignalreason">#</a></span><a aria-hidden="true" class="legacy" id="globals_abortsignal_reason"></a></h5>
<div class="api_metadata">
<span>Added in: v17.2.0, v16.14.0</span>
</div>
<ul>
<li>Type: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Data_types" class="type"><any></a></li>
</ul>
<p>An optional reason specified when the <code>AbortSignal</code> was triggered.</p>
<pre><code class="language-js"><span class="hljs-keyword">const</span> ac = <span class="hljs-keyword">new</span> <span class="hljs-title class_">AbortController</span>();
ac.<span class="hljs-title function_">abort</span>(<span class="hljs-keyword">new</span> <span class="hljs-title class_">Error</span>(<span class="hljs-string">'boom!'</span>));
<span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(ac.<span class="hljs-property">signal</span>.<span class="hljs-property">reason</span>); <span class="hljs-comment">// Error: boom!</span></code> <button class="copy-button">copy</button></pre>
<h5><code>abortSignal.throwIfAborted()</code><span><a class="mark" href="#abortsignalthrowifaborted" id="abortsignalthrowifaborted">#</a></span><a aria-hidden="true" class="legacy" id="globals_abortsignal_throwifaborted"></a></h5>
<div class="api_metadata">
<span>Added in: v17.3.0, v16.17.0</span>
</div>
<p>If <code>abortSignal.aborted</code> is <code>true</code>, throws <code>abortSignal.reason</code>.</p>
</section><section><h3>Class: <code>Blob</code><span><a class="mark" href="#class-blob" id="class-blob">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_blob"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p>See <a href="buffer.html#class-blob" class="type"><Blob></a>.</p>
</section><section><h3>Class: <code>Buffer</code><span><a class="mark" href="#class-buffer" id="class-buffer">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_buffer"></a></h3>
<div class="api_metadata">
<span>Added in: v0.1.103</span>
</div>
<ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function" class="type"><Function></a></li>
</ul>
<p>Used to handle binary data. See the <a href="buffer.html">buffer section</a>.</p>
</section><section><h3>Class: <code>ByteLengthQueuingStrategy</code><span><a class="mark" href="#class-bytelengthqueuingstrategy" id="class-bytelengthqueuingstrategy">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_bytelengthqueuingstrategy"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental.</div><p></p>
<p>A browser-compatible implementation of <a href="webstreams.html#class-bytelengthqueuingstrategy"><code>ByteLengthQueuingStrategy</code></a>.</p>
</section><section><h3><code>__dirname</code><span><a class="mark" href="#__dirname" id="__dirname">#</a></span><a aria-hidden="true" class="legacy" id="globals_dirname"></a></h3>
<p>This variable may appear to be global but is not. See <a href="modules.html#__dirname"><code>__dirname</code></a>.</p>
</section><section><h3><code>__filename</code><span><a class="mark" href="#__filename" id="__filename">#</a></span><a aria-hidden="true" class="legacy" id="globals_filename"></a></h3>
<p>This variable may appear to be global but is not. See <a href="modules.html#__filename"><code>__filename</code></a>.</p>
</section><section><h3><code>atob(data)</code><span><a class="mark" href="#atobdata" id="atobdata">#</a></span><a aria-hidden="true" class="legacy" id="globals_atob_data"></a></h3>
<div class="api_metadata">
<span>Added in: v16.0.0</span>
</div>
<p></p><div class="api_stability api_stability_3"><a href="documentation.html#stability-index">Stability: 3</a> - Legacy. Use <code>Buffer.from(data, 'base64')</code> instead.</div><p></p>
<p>Global alias for <a href="buffer.html#bufferatobdata"><code>buffer.atob()</code></a>.</p>
</section><section><h3><code>BroadcastChannel</code><span><a class="mark" href="#broadcastchannel" id="broadcastchannel">#</a></span><a aria-hidden="true" class="legacy" id="globals_broadcastchannel"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p>See <a href="worker_threads.html#class-broadcastchannel-extends-eventtarget" class="type"><BroadcastChannel></a>.</p>
</section><section><h3><code>btoa(data)</code><span><a class="mark" href="#btoadata" id="btoadata">#</a></span><a aria-hidden="true" class="legacy" id="globals_btoa_data"></a></h3>
<div class="api_metadata">
<span>Added in: v16.0.0</span>
</div>
<p></p><div class="api_stability api_stability_3"><a href="documentation.html#stability-index">Stability: 3</a> - Legacy. Use <code>buf.toString('base64')</code> instead.</div><p></p>
<p>Global alias for <a href="buffer.html#bufferbtoadata"><code>buffer.btoa()</code></a>.</p>
</section><section><h3><code>clearImmediate(immediateObject)</code><span><a class="mark" href="#clearimmediateimmediateobject" id="clearimmediateimmediateobject">#</a></span><a aria-hidden="true" class="legacy" id="globals_clearimmediate_immediateobject"></a></h3>
<div class="api_metadata">
<span>Added in: v0.9.1</span>
</div>
<p><a href="timers.html#clearimmediateimmediate"><code>clearImmediate</code></a> is described in the <a href="timers.html">timers</a> section.</p>
</section><section><h3><code>clearInterval(intervalObject)</code><span><a class="mark" href="#clearintervalintervalobject" id="clearintervalintervalobject">#</a></span><a aria-hidden="true" class="legacy" id="globals_clearinterval_intervalobject"></a></h3>
<div class="api_metadata">
<span>Added in: v0.0.1</span>
</div>
<p><a href="timers.html#clearintervaltimeout"><code>clearInterval</code></a> is described in the <a href="timers.html">timers</a> section.</p>
</section><section><h3><code>clearTimeout(timeoutObject)</code><span><a class="mark" href="#cleartimeouttimeoutobject" id="cleartimeouttimeoutobject">#</a></span><a aria-hidden="true" class="legacy" id="globals_cleartimeout_timeoutobject"></a></h3>
<div class="api_metadata">
<span>Added in: v0.0.1</span>
</div>
<p><a href="timers.html#cleartimeouttimeout"><code>clearTimeout</code></a> is described in the <a href="timers.html">timers</a> section.</p>
</section><section><h3>Class: <code>CompressionStream</code><span><a class="mark" href="#class-compressionstream" id="class-compressionstream">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_compressionstream"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental.</div><p></p>
<p>A browser-compatible implementation of <a href="webstreams.html#class-compressionstream"><code>CompressionStream</code></a>.</p>
</section><section><h3><code>console</code><span><a class="mark" href="#console" id="console">#</a></span><a aria-hidden="true" class="legacy" id="globals_console"></a></h3>
<div class="api_metadata">
<span>Added in: v0.1.100</span>
</div>
<ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object" class="type"><Object></a></li>
</ul>
<p>Used to print to stdout and stderr. See the <a href="console.html"><code>console</code></a> section.</p>
</section><section><h3>Class: <code>CountQueuingStrategy</code><span><a class="mark" href="#class-countqueuingstrategy" id="class-countqueuingstrategy">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_countqueuingstrategy"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental.</div><p></p>
<p>A browser-compatible implementation of <a href="webstreams.html#class-countqueuingstrategy"><code>CountQueuingStrategy</code></a>.</p>
</section><section><h3><code>Crypto</code><span><a class="mark" href="#crypto" id="crypto">#</a></span><a aria-hidden="true" class="legacy" id="globals_crypto"></a></h3>
<div class="api_metadata">
<details class="changelog"><summary>History</summary>
<table>
<tbody><tr><th>Version</th><th>Changes</th></tr>
<tr><td>v19.0.0</td>
<td><p>No longer behind <code>--experimental-global-webcrypto</code> CLI flag.</p></td></tr>
<tr><td>v17.6.0, v16.15.0</td>
<td><p><span>Added in: v17.6.0, v16.15.0</span></p></td></tr>
</tbody></table>
</details>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental. Disable this API with the
<a href="cli.html#--no-experimental-global-webcrypto"><code>--no-experimental-global-webcrypto</code></a> CLI flag.</div><p></p>
<p>A browser-compatible implementation of <a href="webcrypto.html#class-crypto" class="type"><Crypto></a>. This global is available
only if the Node.js binary was compiled with including support for the
<code>node:crypto</code> module.</p>
</section><section><h3><code>crypto</code><span><a class="mark" href="#crypto_1" id="crypto_1">#</a></span><a aria-hidden="true" class="legacy" id="globals_crypto_1"></a></h3>
<div class="api_metadata">
<details class="changelog"><summary>History</summary>
<table>
<tbody><tr><th>Version</th><th>Changes</th></tr>
<tr><td>v19.0.0</td>
<td><p>No longer behind <code>--experimental-global-webcrypto</code> CLI flag.</p></td></tr>
<tr><td>v17.6.0, v16.15.0</td>
<td><p><span>Added in: v17.6.0, v16.15.0</span></p></td></tr>
</tbody></table>
</details>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental. Disable this API with the
<a href="cli.html#--no-experimental-global-webcrypto"><code>--no-experimental-global-webcrypto</code></a> CLI flag.</div><p></p>
<p>A browser-compatible implementation of the <a href="webcrypto.html">Web Crypto API</a>.</p>
</section><section><h3><code>CryptoKey</code><span><a class="mark" href="#cryptokey" id="cryptokey">#</a></span><a aria-hidden="true" class="legacy" id="globals_cryptokey"></a></h3>
<div class="api_metadata">
<details class="changelog"><summary>History</summary>
<table>
<tbody><tr><th>Version</th><th>Changes</th></tr>
<tr><td>v19.0.0</td>
<td><p>No longer behind <code>--experimental-global-webcrypto</code> CLI flag.</p></td></tr>
<tr><td>v17.6.0, v16.15.0</td>
<td><p><span>Added in: v17.6.0, v16.15.0</span></p></td></tr>
</tbody></table>
</details>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental. Disable this API with the
<a href="cli.html#--no-experimental-global-webcrypto"><code>--no-experimental-global-webcrypto</code></a> CLI flag.</div><p></p>
<p>A browser-compatible implementation of <a href="webcrypto.html#class-cryptokey" class="type"><CryptoKey></a>. This global is available
only if the Node.js binary was compiled with including support for the
<code>node:crypto</code> module.</p>
</section><section><h3><code>CustomEvent</code><span><a class="mark" href="#customevent" id="customevent">#</a></span><a aria-hidden="true" class="legacy" id="globals_customevent"></a></h3>
<div class="api_metadata">
<details class="changelog"><summary>History</summary>
<table>
<tbody><tr><th>Version</th><th>Changes</th></tr>
<tr><td>v22.1.0, v20.13.0</td>
<td><p>CustomEvent is now stable.</p></td></tr>
<tr><td>v19.0.0</td>
<td><p>No longer behind <code>--experimental-global-customevent</code> CLI flag.</p></td></tr>
<tr><td>v18.7.0, v16.17.0</td>
<td><p><span>Added in: v18.7.0, v16.17.0</span></p></td></tr>
</tbody></table>
</details>
</div>
<p></p><div class="api_stability api_stability_2"><a href="documentation.html#stability-index">Stability: 2</a> - Stable
<a href="cli.html#--no-experimental-global-customevent"><code>--no-experimental-global-customevent</code></a> CLI flag.</div><p></p>
<p>A browser-compatible implementation of the <a href="https://dom.spec.whatwg.org/#customevent"><code>CustomEvent</code> Web API</a>.</p>
</section><section><h3>Class: <code>DecompressionStream</code><span><a class="mark" href="#class-decompressionstream" id="class-decompressionstream">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_decompressionstream"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental.</div><p></p>
<p>A browser-compatible implementation of <a href="webstreams.html#class-decompressionstream"><code>DecompressionStream</code></a>.</p>
</section><section><h3><code>Event</code><span><a class="mark" href="#event" id="event">#</a></span><a aria-hidden="true" class="legacy" id="globals_event"></a></h3>
<div class="api_metadata">
<details class="changelog"><summary>History</summary>
<table>
<tbody><tr><th>Version</th><th>Changes</th></tr>
<tr><td>v15.4.0</td>
<td><p>No longer experimental.</p></td></tr>
<tr><td>v15.0.0</td>
<td><p><span>Added in: v15.0.0</span></p></td></tr>
</tbody></table>
</details>
</div>
<p>A browser-compatible implementation of the <code>Event</code> class. See
<a href="events.html#eventtarget-and-event-api"><code>EventTarget</code> and <code>Event</code> API</a> for more details.</p>
</section><section><h3><code>EventSource</code><span><a class="mark" href="#eventsource" id="eventsource">#</a></span><a aria-hidden="true" class="legacy" id="globals_eventsource"></a></h3>
<div class="api_metadata">
<span>Added in: v22.3.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental. Enable this API with the <a href="cli.html#--experimental-eventsource"><code>--experimental-eventsource</code></a>
CLI flag.</div><p></p>
<p>A browser-compatible implementation of the <a href="https://developer.mozilla.org/en-US/docs/Web/API/EventSource"><code>EventSource</code></a> class.</p>
</section><section><h3><code>EventTarget</code><span><a class="mark" href="#eventtarget" id="eventtarget">#</a></span><a aria-hidden="true" class="legacy" id="globals_eventtarget"></a></h3>
<div class="api_metadata">
<details class="changelog"><summary>History</summary>
<table>
<tbody><tr><th>Version</th><th>Changes</th></tr>
<tr><td>v15.4.0</td>
<td><p>No longer experimental.</p></td></tr>
<tr><td>v15.0.0</td>
<td><p><span>Added in: v15.0.0</span></p></td></tr>
</tbody></table>
</details>
</div>
<p>A browser-compatible implementation of the <code>EventTarget</code> class. See
<a href="events.html#eventtarget-and-event-api"><code>EventTarget</code> and <code>Event</code> API</a> for more details.</p>
</section><section><h3><code>exports</code><span><a class="mark" href="#exports" id="exports">#</a></span><a aria-hidden="true" class="legacy" id="globals_exports"></a></h3>
<p>This variable may appear to be global but is not. See <a href="modules.html#exports"><code>exports</code></a>.</p>
</section><section><h3><code>fetch</code><span><a class="mark" href="#fetch" id="fetch">#</a></span><a aria-hidden="true" class="legacy" id="globals_fetch"></a></h3>
<div class="api_metadata">
<details class="changelog"><summary>History</summary>
<table>
<tbody><tr><th>Version</th><th>Changes</th></tr>
<tr><td>v21.0.0</td>
<td><p>No longer experimental.</p></td></tr>
<tr><td>v18.0.0</td>
<td><p>No longer behind <code>--experimental-fetch</code> CLI flag.</p></td></tr>
<tr><td>v17.5.0, v16.15.0</td>
<td><p><span>Added in: v17.5.0, v16.15.0</span></p></td></tr>
</tbody></table>
</details>
</div>
<p></p><div class="api_stability api_stability_2"><a href="documentation.html#stability-index">Stability: 2</a> - Stable</div><p></p>
<p>A browser-compatible implementation of the <a href="https://developer.mozilla.org/en-US/docs/Web/API/fetch"><code>fetch()</code></a> function.</p>
</section><section><h3>Class: <code>File</code><span><a class="mark" href="#class-file" id="class-file">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_file"></a></h3>
<div class="api_metadata">
<span>Added in: v20.0.0</span>
</div>
<p>See <a href="buffer.html#class-file" class="type"><File></a>.</p>
</section><section><h3>Class <code>FormData</code><span><a class="mark" href="#class-formdata" id="class-formdata">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_formdata"></a></h3>
<div class="api_metadata">
<details class="changelog"><summary>History</summary>
<table>
<tbody><tr><th>Version</th><th>Changes</th></tr>
<tr><td>v21.0.0</td>
<td><p>No longer experimental.</p></td></tr>
<tr><td>v18.0.0</td>
<td><p>No longer behind <code>--experimental-fetch</code> CLI flag.</p></td></tr>
<tr><td>v17.6.0, v16.15.0</td>
<td><p><span>Added in: v17.6.0, v16.15.0</span></p></td></tr>
</tbody></table>
</details>
</div>
<p></p><div class="api_stability api_stability_2"><a href="documentation.html#stability-index">Stability: 2</a> - Stable</div><p></p>
<p>A browser-compatible implementation of <a href="https://developer.mozilla.org/en-US/docs/Web/API/FormData" class="type"><FormData></a>.</p>
</section><section><h3><code>global</code><span><a class="mark" href="#global" id="global">#</a></span><a aria-hidden="true" class="legacy" id="globals_global"></a></h3>
<div class="api_metadata">
<span>Added in: v0.1.27</span>
</div>
<p></p><div class="api_stability api_stability_3"><a href="documentation.html#stability-index">Stability: 3</a> - Legacy. Use <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/globalThis"><code>globalThis</code></a> instead.</div><p></p>
<ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object" class="type"><Object></a> The global namespace object.</li>
</ul>
<p>In browsers, the top-level scope has traditionally been the global scope. This
means that <code>var something</code> will define a new global variable, except within
ECMAScript modules. In Node.js, this is different. The top-level scope is not
the global scope; <code>var something</code> inside a Node.js module will be local to that
module, regardless of whether it is a <a href="modules.html">CommonJS module</a> or an
<a href="esm.html">ECMAScript module</a>.</p>
</section><section><h3>Class <code>Headers</code><span><a class="mark" href="#class-headers" id="class-headers">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_headers"></a></h3>
<div class="api_metadata">
<details class="changelog"><summary>History</summary>
<table>
<tbody><tr><th>Version</th><th>Changes</th></tr>
<tr><td>v21.0.0</td>
<td><p>No longer experimental.</p></td></tr>
<tr><td>v18.0.0</td>
<td><p>No longer behind <code>--experimental-fetch</code> CLI flag.</p></td></tr>
<tr><td>v17.5.0, v16.15.0</td>
<td><p><span>Added in: v17.5.0, v16.15.0</span></p></td></tr>
</tbody></table>
</details>
</div>
<p></p><div class="api_stability api_stability_2"><a href="documentation.html#stability-index">Stability: 2</a> - Stable</div><p></p>
<p>A browser-compatible implementation of <a href="https://developer.mozilla.org/en-US/docs/Web/API/Headers" class="type"><Headers></a>.</p>
</section><section><h3><code>localStorage</code><span><a class="mark" href="#localstorage" id="localstorage">#</a></span><a aria-hidden="true" class="legacy" id="globals_localstorage"></a></h3>
<div class="api_metadata">
<span>Added in: v22.4.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a>.0 - Early development.</div><p></p>
<p>A browser-compatible implementation of <a href="https://developer.mozilla.org/en-US/docs/Web/API/Window/localStorage"><code>localStorage</code></a>. Data is stored
unencrypted in the file specified by the <a href="cli.html#--localstorage-filefile"><code>--localstorage-file</code></a> CLI flag.
The maximum amount of data that can be stored is 10 MB.
Any modification of this data outside of the Web Storage API is not supported.
Enable this API with the <a href="cli.html#--experimental-webstorage"><code>--experimental-webstorage</code></a> CLI flag.
<code>localStorage</code> data is not stored per user or per request when used in the context
of a server, it is shared across all users and requests.</p>
</section><section><h3><code>MessageChannel</code><span><a class="mark" href="#messagechannel" id="messagechannel">#</a></span><a aria-hidden="true" class="legacy" id="globals_messagechannel"></a></h3>
<div class="api_metadata">
<span>Added in: v15.0.0</span>
</div>
<p>The <code>MessageChannel</code> class. See <a href="worker_threads.html#class-messagechannel"><code>MessageChannel</code></a> for more details.</p>
</section><section><h3><code>MessageEvent</code><span><a class="mark" href="#messageevent" id="messageevent">#</a></span><a aria-hidden="true" class="legacy" id="globals_messageevent"></a></h3>
<div class="api_metadata">
<span>Added in: v15.0.0</span>
</div>
<p>The <code>MessageEvent</code> class. See <a href="https://developer.mozilla.org/en-US/docs/Web/API/MessageEvent/MessageEvent"><code>MessageEvent</code></a> for more details.</p>
</section><section><h3><code>MessagePort</code><span><a class="mark" href="#messageport" id="messageport">#</a></span><a aria-hidden="true" class="legacy" id="globals_messageport"></a></h3>
<div class="api_metadata">
<span>Added in: v15.0.0</span>
</div>
<p>The <code>MessagePort</code> class. See <a href="worker_threads.html#class-messageport"><code>MessagePort</code></a> for more details.</p>
</section><section><h3><code>module</code><span><a class="mark" href="#module" id="module">#</a></span><a aria-hidden="true" class="legacy" id="globals_module"></a></h3>
<p>This variable may appear to be global but is not. See <a href="modules.html#module"><code>module</code></a>.</p>
</section><section><h3><code>Navigator</code><span><a class="mark" href="#navigator" id="navigator">#</a></span><a aria-hidden="true" class="legacy" id="globals_navigator"></a></h3>
<div class="api_metadata">
<span>Added in: v21.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a>.1 - Active development. Disable this API with the
<a href="cli.html#--no-experimental-global-navigator"><code>--no-experimental-global-navigator</code></a> CLI flag.</div><p></p>
<p>A partial implementation of the <a href="https://html.spec.whatwg.org/multipage/system-state.html#the-navigator-object">Navigator API</a>.</p>
</section><section><h3><code>navigator</code><span><a class="mark" href="#navigator_1" id="navigator_1">#</a></span><a aria-hidden="true" class="legacy" id="globals_navigator_1"></a></h3>
<div class="api_metadata">
<span>Added in: v21.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a>.1 - Active development. Disable this API with the
<a href="cli.html#--no-experimental-global-navigator"><code>--no-experimental-global-navigator</code></a> CLI flag.</div><p></p>
<p>A partial implementation of <a href="https://developer.mozilla.org/en-US/docs/Web/API/Window/navigator"><code>window.navigator</code></a>.</p>
<h4><code>navigator.hardwareConcurrency</code><span><a class="mark" href="#navigatorhardwareconcurrency" id="navigatorhardwareconcurrency">#</a></span><a aria-hidden="true" class="legacy" id="globals_navigator_hardwareconcurrency"></a></h4>
<div class="api_metadata">
<span>Added in: v21.0.0</span>
</div>
<ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type" class="type"><number></a></li>
</ul>
<p>The <code>navigator.hardwareConcurrency</code> read-only property returns the number of
logical processors available to the current Node.js instance.</p>
<pre><code class="language-js"><span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-string">`This process is running on <span class="hljs-subst">${navigator.hardwareConcurrency}</span> logical processors`</span>);</code> <button class="copy-button">copy</button></pre>
<h4><code>navigator.language</code><span><a class="mark" href="#navigatorlanguage" id="navigatorlanguage">#</a></span><a aria-hidden="true" class="legacy" id="globals_navigator_language"></a></h4>
<div class="api_metadata">
<span>Added in: v21.2.0</span>
</div>
<ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a></li>
</ul>
<p>The <code>navigator.language</code> read-only property returns a string representing the
preferred language of the Node.js instance. The language will be determined by
the ICU library used by Node.js at runtime based on the
default language of the operating system.</p>
<p>The value is representing the language version as defined in <a href="https://www.rfc-editor.org/rfc/rfc5646.txt">RFC 5646</a>.</p>
<p>The fallback value on builds without ICU is <code>'en-US'</code>.</p>
<pre><code class="language-js"><span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-string">`The preferred language of the Node.js instance has the tag '<span class="hljs-subst">${navigator.language}</span>'`</span>);</code> <button class="copy-button">copy</button></pre>
<h4><code>navigator.languages</code><span><a class="mark" href="#navigatorlanguages" id="navigatorlanguages">#</a></span><a aria-hidden="true" class="legacy" id="globals_navigator_languages"></a></h4>
<div class="api_metadata">
<span>Added in: v21.2.0</span>
</div>
<ul>
<li>{Array<string>}</string></li>
</ul>
<p>The <code>navigator.languages</code> read-only property returns an array of strings
representing the preferred languages of the Node.js instance.
By default <code>navigator.languages</code> contains only the value of
<code>navigator.language</code>, which will be determined by the ICU library used by
Node.js at runtime based on the default language of the operating system.</p>
<p>The fallback value on builds without ICU is <code>['en-US']</code>.</p>
<pre><code class="language-js"><span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-string">`The preferred languages are '<span class="hljs-subst">${navigator.languages}</span>'`</span>);</code> <button class="copy-button">copy</button></pre>
<h4><code>navigator.platform</code><span><a class="mark" href="#navigatorplatform" id="navigatorplatform">#</a></span><a aria-hidden="true" class="legacy" id="globals_navigator_platform"></a></h4>
<div class="api_metadata">
<span>Added in: v21.2.0</span>
</div>
<ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a></li>
</ul>
<p>The <code>navigator.platform</code> read-only property returns a string identifying the
platform on which the Node.js instance is running.</p>
<pre><code class="language-js"><span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-string">`This process is running on <span class="hljs-subst">${navigator.platform}</span>`</span>);</code> <button class="copy-button">copy</button></pre>
<h4><code>navigator.userAgent</code><span><a class="mark" href="#navigatoruseragent" id="navigatoruseragent">#</a></span><a aria-hidden="true" class="legacy" id="globals_navigator_useragent"></a></h4>
<div class="api_metadata">
<span>Added in: v21.1.0</span>
</div>
<ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a></li>
</ul>
<p>The <code>navigator.userAgent</code> read-only property returns user agent
consisting of the runtime name and major version number.</p>
<pre><code class="language-js"><span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-string">`The user-agent is <span class="hljs-subst">${navigator.userAgent}</span>`</span>); <span class="hljs-comment">// Prints "Node.js/21"</span></code> <button class="copy-button">copy</button></pre>
</section><section><h3><code>PerformanceEntry</code><span><a class="mark" href="#performanceentry" id="performanceentry">#</a></span><a aria-hidden="true" class="legacy" id="globals_performanceentry"></a></h3>
<div class="api_metadata">
<span>Added in: v19.0.0</span>
</div>
<p>The <code>PerformanceEntry</code> class. See <a href="perf_hooks.html#class-performanceentry"><code>PerformanceEntry</code></a> for more details.</p>
</section><section><h3><code>PerformanceMark</code><span><a class="mark" href="#performancemark" id="performancemark">#</a></span><a aria-hidden="true" class="legacy" id="globals_performancemark"></a></h3>
<div class="api_metadata">
<span>Added in: v19.0.0</span>
</div>
<p>The <code>PerformanceMark</code> class. See <a href="perf_hooks.html#class-performancemark"><code>PerformanceMark</code></a> for more details.</p>
</section><section><h3><code>PerformanceMeasure</code><span><a class="mark" href="#performancemeasure" id="performancemeasure">#</a></span><a aria-hidden="true" class="legacy" id="globals_performancemeasure"></a></h3>
<div class="api_metadata">
<span>Added in: v19.0.0</span>
</div>
<p>The <code>PerformanceMeasure</code> class. See <a href="perf_hooks.html#class-performancemeasure"><code>PerformanceMeasure</code></a> for more details.</p>
</section><section><h3><code>PerformanceObserver</code><span><a class="mark" href="#performanceobserver" id="performanceobserver">#</a></span><a aria-hidden="true" class="legacy" id="globals_performanceobserver"></a></h3>
<div class="api_metadata">
<span>Added in: v19.0.0</span>
</div>
<p>The <code>PerformanceObserver</code> class. See <a href="perf_hooks.html#class-performanceobserver"><code>PerformanceObserver</code></a> for more details.</p>
</section><section><h3><code>PerformanceObserverEntryList</code><span><a class="mark" href="#performanceobserverentrylist" id="performanceobserverentrylist">#</a></span><a aria-hidden="true" class="legacy" id="globals_performanceobserverentrylist"></a></h3>
<div class="api_metadata">
<span>Added in: v19.0.0</span>
</div>
<p>The <code>PerformanceObserverEntryList</code> class. See
<a href="perf_hooks.html#class-performanceobserverentrylist"><code>PerformanceObserverEntryList</code></a> for more details.</p>
</section><section><h3><code>PerformanceResourceTiming</code><span><a class="mark" href="#performanceresourcetiming" id="performanceresourcetiming">#</a></span><a aria-hidden="true" class="legacy" id="globals_performanceresourcetiming"></a></h3>
<div class="api_metadata">
<span>Added in: v19.0.0</span>
</div>
<p>The <code>PerformanceResourceTiming</code> class. See <a href="perf_hooks.html#class-performanceresourcetiming"><code>PerformanceResourceTiming</code></a> for
more details.</p>
</section><section><h3><code>performance</code><span><a class="mark" href="#performance" id="performance">#</a></span><a aria-hidden="true" class="legacy" id="globals_performance"></a></h3>
<div class="api_metadata">
<span>Added in: v16.0.0</span>
</div>
<p>The <a href="perf_hooks.html#perf_hooksperformance"><code>perf_hooks.performance</code></a> object.</p>
</section><section><h3><code>process</code><span><a class="mark" href="#process" id="process">#</a></span><a aria-hidden="true" class="legacy" id="globals_process"></a></h3>
<div class="api_metadata">
<span>Added in: v0.1.7</span>
</div>
<ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object" class="type"><Object></a></li>
</ul>
<p>The process object. See the <a href="process.html#process"><code>process</code> object</a> section.</p>
</section><section><h3><code>queueMicrotask(callback)</code><span><a class="mark" href="#queuemicrotaskcallback" id="queuemicrotaskcallback">#</a></span><a aria-hidden="true" class="legacy" id="globals_queuemicrotask_callback"></a></h3>
<div class="api_metadata">
<span>Added in: v11.0.0</span>
</div>
<ul>
<li><code>callback</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function" class="type"><Function></a> Function to be queued.</li>
</ul>
<p>The <code>queueMicrotask()</code> method queues a microtask to invoke <code>callback</code>. If
<code>callback</code> throws an exception, the <a href="process.html#process"><code>process</code> object</a> <code>'uncaughtException'</code>
event will be emitted.</p>
<p>The microtask queue is managed by V8 and may be used in a similar manner to
the <a href="process.html#processnexttickcallback-args"><code>process.nextTick()</code></a> queue, which is managed by Node.js. The
<code>process.nextTick()</code> queue is always processed before the microtask queue
within each turn of the Node.js event loop.</p>
<pre><code class="language-js"><span class="hljs-comment">// Here, `queueMicrotask()` is used to ensure the 'load' event is always</span>
<span class="hljs-comment">// emitted asynchronously, and therefore consistently. Using</span>
<span class="hljs-comment">// `process.nextTick()` here would result in the 'load' event always emitting</span>
<span class="hljs-comment">// before any other promise jobs.</span>
<span class="hljs-title class_">DataHandler</span>.<span class="hljs-property"><span class="hljs-keyword">prototype</span></span>.<span class="hljs-property">load</span> = <span class="hljs-keyword">async</span> <span class="hljs-keyword">function</span> <span class="hljs-title function_">load</span>(<span class="hljs-params">key</span>) {
<span class="hljs-keyword">const</span> hit = <span class="hljs-variable language_">this</span>.<span class="hljs-property">_cache</span>.<span class="hljs-title function_">get</span>(key);
<span class="hljs-keyword">if</span> (hit !== <span class="hljs-literal">undefined</span>) {
<span class="hljs-title function_">queueMicrotask</span>(<span class="hljs-function">() =></span> {
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">emit</span>(<span class="hljs-string">'load'</span>, hit);
});
<span class="hljs-keyword">return</span>;
}
<span class="hljs-keyword">const</span> data = <span class="hljs-keyword">await</span> <span class="hljs-title function_">fetchData</span>(key);
<span class="hljs-variable language_">this</span>.<span class="hljs-property">_cache</span>.<span class="hljs-title function_">set</span>(key, data);
<span class="hljs-variable language_">this</span>.<span class="hljs-title function_">emit</span>(<span class="hljs-string">'load'</span>, data);
};</code> <button class="copy-button">copy</button></pre>
</section><section><h3>Class: <code>ReadableByteStreamController</code><span><a class="mark" href="#class-readablebytestreamcontroller" id="class-readablebytestreamcontroller">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_readablebytestreamcontroller"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental.</div><p></p>
<p>A browser-compatible implementation of <a href="webstreams.html#class-readablebytestreamcontroller"><code>ReadableByteStreamController</code></a>.</p>
</section><section><h3>Class: <code>ReadableStream</code><span><a class="mark" href="#class-readablestream" id="class-readablestream">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_readablestream"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental.</div><p></p>
<p>A browser-compatible implementation of <a href="webstreams.html#class-readablestream"><code>ReadableStream</code></a>.</p>
</section><section><h3>Class: <code>ReadableStreamBYOBReader</code><span><a class="mark" href="#class-readablestreambyobreader" id="class-readablestreambyobreader">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_readablestreambyobreader"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental.</div><p></p>
<p>A browser-compatible implementation of <a href="webstreams.html#class-readablestreambyobreader"><code>ReadableStreamBYOBReader</code></a>.</p>
</section><section><h3>Class: <code>ReadableStreamBYOBRequest</code><span><a class="mark" href="#class-readablestreambyobrequest" id="class-readablestreambyobrequest">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_readablestreambyobrequest"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental.</div><p></p>
<p>A browser-compatible implementation of <a href="webstreams.html#class-readablestreambyobrequest"><code>ReadableStreamBYOBRequest</code></a>.</p>
</section><section><h3>Class: <code>ReadableStreamDefaultController</code><span><a class="mark" href="#class-readablestreamdefaultcontroller" id="class-readablestreamdefaultcontroller">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_readablestreamdefaultcontroller"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental.</div><p></p>
<p>A browser-compatible implementation of <a href="webstreams.html#class-readablestreamdefaultcontroller"><code>ReadableStreamDefaultController</code></a>.</p>
</section><section><h3>Class: <code>ReadableStreamDefaultReader</code><span><a class="mark" href="#class-readablestreamdefaultreader" id="class-readablestreamdefaultreader">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_readablestreamdefaultreader"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental.</div><p></p>
<p>A browser-compatible implementation of <a href="webstreams.html#class-readablestreamdefaultreader"><code>ReadableStreamDefaultReader</code></a>.</p>
</section><section><h3><code>require()</code><span><a class="mark" href="#require" id="require">#</a></span><a aria-hidden="true" class="legacy" id="globals_require"></a></h3>
<p>This variable may appear to be global but is not. See <a href="modules.html#requireid"><code>require()</code></a>.</p>
</section><section><h3><code>Response</code><span><a class="mark" href="#response" id="response">#</a></span><a aria-hidden="true" class="legacy" id="globals_response"></a></h3>
<div class="api_metadata">
<details class="changelog"><summary>History</summary>
<table>
<tbody><tr><th>Version</th><th>Changes</th></tr>
<tr><td>v21.0.0</td>
<td><p>No longer experimental.</p></td></tr>
<tr><td>v18.0.0</td>
<td><p>No longer behind <code>--experimental-fetch</code> CLI flag.</p></td></tr>
<tr><td>v17.5.0, v16.15.0</td>
<td><p><span>Added in: v17.5.0, v16.15.0</span></p></td></tr>
</tbody></table>
</details>
</div>
<p></p><div class="api_stability api_stability_2"><a href="documentation.html#stability-index">Stability: 2</a> - Stable</div><p></p>
<p>A browser-compatible implementation of <a href="https://developer.mozilla.org/en-US/docs/Web/API/Response" class="type"><Response></a>.</p>
</section><section><h3><code>Request</code><span><a class="mark" href="#request" id="request">#</a></span><a aria-hidden="true" class="legacy" id="globals_request"></a></h3>
<div class="api_metadata">
<details class="changelog"><summary>History</summary>
<table>
<tbody><tr><th>Version</th><th>Changes</th></tr>
<tr><td>v21.0.0</td>
<td><p>No longer experimental.</p></td></tr>
<tr><td>v18.0.0</td>
<td><p>No longer behind <code>--experimental-fetch</code> CLI flag.</p></td></tr>
<tr><td>v17.5.0, v16.15.0</td>
<td><p><span>Added in: v17.5.0, v16.15.0</span></p></td></tr>
</tbody></table>
</details>
</div>
<p></p><div class="api_stability api_stability_2"><a href="documentation.html#stability-index">Stability: 2</a> - Stable</div><p></p>
<p>A browser-compatible implementation of <a href="https://developer.mozilla.org/en-US/docs/Web/API/Request" class="type"><Request></a>.</p>
</section><section><h3><code>sessionStorage</code><span><a class="mark" href="#sessionstorage" id="sessionstorage">#</a></span><a aria-hidden="true" class="legacy" id="globals_sessionstorage"></a></h3>
<div class="api_metadata">
<span>Added in: v22.4.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a>.0 - Early development.</div><p></p>
<p>A browser-compatible implementation of <a href="https://developer.mozilla.org/en-US/docs/Web/API/Window/sessionStorage"><code>sessionStorage</code></a>. Data is stored in
memory, with a storage quota of 10 MB. <code>sessionStorage</code> data persists only within
the currently running process, and is not shared between workers.</p>
</section><section><h3><code>setImmediate(callback[, ...args])</code><span><a class="mark" href="#setimmediatecallback-args" id="setimmediatecallback-args">#</a></span><a aria-hidden="true" class="legacy" id="globals_setimmediate_callback_args"></a></h3>
<div class="api_metadata">
<span>Added in: v0.9.1</span>
</div>
<p><a href="timers.html#setimmediatecallback-args"><code>setImmediate</code></a> is described in the <a href="timers.html">timers</a> section.</p>
</section><section><h3><code>setInterval(callback, delay[, ...args])</code><span><a class="mark" href="#setintervalcallback-delay-args" id="setintervalcallback-delay-args">#</a></span><a aria-hidden="true" class="legacy" id="globals_setinterval_callback_delay_args"></a></h3>
<div class="api_metadata">
<span>Added in: v0.0.1</span>
</div>
<p><a href="timers.html#setintervalcallback-delay-args"><code>setInterval</code></a> is described in the <a href="timers.html">timers</a> section.</p>
</section><section><h3><code>setTimeout(callback, delay[, ...args])</code><span><a class="mark" href="#settimeoutcallback-delay-args" id="settimeoutcallback-delay-args">#</a></span><a aria-hidden="true" class="legacy" id="globals_settimeout_callback_delay_args"></a></h3>
<div class="api_metadata">
<span>Added in: v0.0.1</span>
</div>
<p><a href="timers.html#settimeoutcallback-delay-args"><code>setTimeout</code></a> is described in the <a href="timers.html">timers</a> section.</p>
</section><section><h3>Class: <code>Storage</code><span><a class="mark" href="#class-storage" id="class-storage">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_storage"></a></h3>
<div class="api_metadata">
<span>Added in: v22.4.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a>.0 - Early development.</div><p></p>
<p>A browser-compatible implementation of <a href="https://developer.mozilla.org/en-US/docs/Web/API/Storage"><code>Storage</code></a>. Enable this API with the
<a href="cli.html#--experimental-webstorage"><code>--experimental-webstorage</code></a> CLI flag.</p>
</section><section><h3><code>structuredClone(value[, options])</code><span><a class="mark" href="#structuredclonevalue-options" id="structuredclonevalue-options">#</a></span><a aria-hidden="true" class="legacy" id="globals_structuredclone_value_options"></a></h3>
<div class="api_metadata">
<span>Added in: v17.0.0</span>
</div>
<p>The WHATWG <a href="https://developer.mozilla.org/en-US/docs/Web/API/structuredClone"><code>structuredClone</code></a> method.</p>
</section><section><h3><code>SubtleCrypto</code><span><a class="mark" href="#subtlecrypto" id="subtlecrypto">#</a></span><a aria-hidden="true" class="legacy" id="globals_subtlecrypto"></a></h3>
<div class="api_metadata">
<details class="changelog"><summary>History</summary>
<table>
<tbody><tr><th>Version</th><th>Changes</th></tr>
<tr><td>v19.0.0</td>
<td><p>No longer behind <code>--experimental-global-webcrypto</code> CLI flag.</p></td></tr>
<tr><td>v17.6.0, v16.15.0</td>
<td><p><span>Added in: v17.6.0, v16.15.0</span></p></td></tr>
</tbody></table>
</details>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental. Disable this API with the
<a href="cli.html#--no-experimental-global-webcrypto"><code>--no-experimental-global-webcrypto</code></a> CLI flag.</div><p></p>
<p>A browser-compatible implementation of <a href="webcrypto.html#class-subtlecrypto" class="type"><SubtleCrypto></a>. This global is available
only if the Node.js binary was compiled with including support for the
<code>node:crypto</code> module.</p>
</section><section><h3><code>DOMException</code><span><a class="mark" href="#domexception" id="domexception">#</a></span><a aria-hidden="true" class="legacy" id="globals_domexception"></a></h3>
<div class="api_metadata">
<span>Added in: v17.0.0</span>
</div>
<p>The WHATWG <code>DOMException</code> class. See <a href="https://developer.mozilla.org/en-US/docs/Web/API/DOMException"><code>DOMException</code></a> for more details.</p>
</section><section><h3><code>TextDecoder</code><span><a class="mark" href="#textdecoder" id="textdecoder">#</a></span><a aria-hidden="true" class="legacy" id="globals_textdecoder"></a></h3>
<div class="api_metadata">
<span>Added in: v11.0.0</span>
</div>
<p>The WHATWG <code>TextDecoder</code> class. See the <a href="util.html#class-utiltextdecoder"><code>TextDecoder</code></a> section.</p>
</section><section><h3>Class: <code>TextDecoderStream</code><span><a class="mark" href="#class-textdecoderstream" id="class-textdecoderstream">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_textdecoderstream"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental.</div><p></p>
<p>A browser-compatible implementation of <a href="webstreams.html#class-textdecoderstream"><code>TextDecoderStream</code></a>.</p>
</section><section><h3><code>TextEncoder</code><span><a class="mark" href="#textencoder" id="textencoder">#</a></span><a aria-hidden="true" class="legacy" id="globals_textencoder"></a></h3>
<div class="api_metadata">
<span>Added in: v11.0.0</span>
</div>
<p>The WHATWG <code>TextEncoder</code> class. See the <a href="util.html#class-utiltextencoder"><code>TextEncoder</code></a> section.</p>
</section><section><h3>Class: <code>TextEncoderStream</code><span><a class="mark" href="#class-textencoderstream" id="class-textencoderstream">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_textencoderstream"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental.</div><p></p>
<p>A browser-compatible implementation of <a href="webstreams.html#class-textencoderstream"><code>TextEncoderStream</code></a>.</p>
</section><section><h3>Class: <code>TransformStream</code><span><a class="mark" href="#class-transformstream" id="class-transformstream">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_transformstream"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental.</div><p></p>
<p>A browser-compatible implementation of <a href="webstreams.html#class-transformstream"><code>TransformStream</code></a>.</p>
</section><section><h3>Class: <code>TransformStreamDefaultController</code><span><a class="mark" href="#class-transformstreamdefaultcontroller" id="class-transformstreamdefaultcontroller">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_transformstreamdefaultcontroller"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental.</div><p></p>
<p>A browser-compatible implementation of <a href="webstreams.html#class-transformstreamdefaultcontroller"><code>TransformStreamDefaultController</code></a>.</p>
</section><section><h3><code>URL</code><span><a class="mark" href="#url" id="url">#</a></span><a aria-hidden="true" class="legacy" id="globals_url"></a></h3>
<div class="api_metadata">
<span>Added in: v10.0.0</span>
</div>
<p>The WHATWG <code>URL</code> class. See the <a href="url.html#class-url"><code>URL</code></a> section.</p>
</section><section><h3><code>URLSearchParams</code><span><a class="mark" href="#urlsearchparams" id="urlsearchparams">#</a></span><a aria-hidden="true" class="legacy" id="globals_urlsearchparams"></a></h3>
<div class="api_metadata">
<span>Added in: v10.0.0</span>
</div>
<p>The WHATWG <code>URLSearchParams</code> class. See the <a href="url.html#class-urlsearchparams"><code>URLSearchParams</code></a> section.</p>
</section><section><h3><code>WebAssembly</code><span><a class="mark" href="#webassembly" id="webassembly">#</a></span><a aria-hidden="true" class="legacy" id="globals_webassembly"></a></h3>
<div class="api_metadata">
<span>Added in: v8.0.0</span>
</div>
<ul>
<li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object" class="type"><Object></a></li>
</ul>
<p>The object that acts as the namespace for all W3C
<a href="https://webassembly.org">WebAssembly</a> related functionality. See the
<a href="https://developer.mozilla.org/en-US/docs/WebAssembly">Mozilla Developer Network</a> for usage and compatibility.</p>
</section><section><h3><code>WebSocket</code><span><a class="mark" href="#websocket" id="websocket">#</a></span><a aria-hidden="true" class="legacy" id="globals_websocket"></a></h3>
<div class="api_metadata">
<details class="changelog"><summary>History</summary>
<table>
<tbody><tr><th>Version</th><th>Changes</th></tr>
<tr><td>v22.4.0</td>
<td><p>No longer experimental.</p></td></tr>
<tr><td>v22.0.0</td>
<td><p>No longer behind <code>--experimental-websocket</code> CLI flag.</p></td></tr>
<tr><td>v21.0.0, v20.10.0</td>
<td><p><span>Added in: v21.0.0, v20.10.0</span></p></td></tr>
</tbody></table>
</details>
</div>
<p></p><div class="api_stability api_stability_2"><a href="documentation.html#stability-index">Stability: 2</a> - Stable.</div><p></p>
<p>A browser-compatible implementation of <a href="https://developer.mozilla.org/en-US/docs/Web/API/WebSocket"><code>WebSocket</code></a>. Disable this API
with the <a href="cli.html#--no-experimental-websocket"><code>--no-experimental-websocket</code></a> CLI flag.</p>
</section><section><h3>Class: <code>WritableStream</code><span><a class="mark" href="#class-writablestream" id="class-writablestream">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_writablestream"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental.</div><p></p>
<p>A browser-compatible implementation of <a href="webstreams.html#class-writablestream"><code>WritableStream</code></a>.</p>
</section><section><h3>Class: <code>WritableStreamDefaultController</code><span><a class="mark" href="#class-writablestreamdefaultcontroller" id="class-writablestreamdefaultcontroller">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_writablestreamdefaultcontroller"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental.</div><p></p>
<p>A browser-compatible implementation of <a href="webstreams.html#class-writablestreamdefaultcontroller"><code>WritableStreamDefaultController</code></a>.</p>
</section><section><h3>Class: <code>WritableStreamDefaultWriter</code><span><a class="mark" href="#class-writablestreamdefaultwriter" id="class-writablestreamdefaultwriter">#</a></span><a aria-hidden="true" class="legacy" id="globals_class_writablestreamdefaultwriter"></a></h3>
<div class="api_metadata">
<span>Added in: v18.0.0</span>
</div>
<p></p><div class="api_stability api_stability_1"><a href="documentation.html#stability-index">Stability: 1</a> - Experimental.</div><p></p>
<p>A browser-compatible implementation of <a href="webstreams.html#class-writablestreamdefaultwriter"><code>WritableStreamDefaultWriter</code></a>.</p></section>
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