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<!DOCTYPE html> <html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width"> <meta name="nodejs.org:node-version" content="v16.20.2"> <title>Global objects | Node.js v16.20.2 Documentation</title> <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Lato:400,700,400italic&display=fallback"> <link rel="stylesheet" href="assets/style.css"> <link rel="stylesheet" href="assets/hljs.css"> <link rel="canonical" href="https://nodejs.org/api/globals.html"> <script async defer src="assets/api.js" type="text/javascript"></script> </head> <body class="alt apidoc" id="api-section-globals"> <div id="content" class="clearfix"> <div id="column2" class="interior"> <div id="intro" class="interior"> <a href="/" title="Go back to the home page"> Node.js </a> </div> <ul> <li><a href="documentation.html" class="nav-documentation">About this documentation</a></li> <li><a href="synopsis.html" class="nav-synopsis">Usage and example</a></li> </ul> <hr 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href="zlib.html" class="nav-zlib">Zlib</a></li> </ul> <hr class="line"> <ul> <li><a href="https://github.com/nodejs/node" class="nav-https-github-com-nodejs-node">Code repository and issue tracker</a></li> </ul> </div> <div id="column1" data-id="globals" class="interior"> <header class="header"> <div class="header-container"> <h1>Node.js v16.20.2 documentation</h1> <button class="theme-toggle-btn" id="theme-toggle-btn" title="Toggle dark mode/light mode" aria-label="Toggle dark mode/light mode" hidden> <svg xmlns="http://www.w3.org/2000/svg" class="icon dark-icon" height="24" width="24"> <path fill="none" d="M0 0h24v24H0z" /> <path d="M11.1 12.08c-2.33-4.51-.5-8.48.53-10.07C6.27 2.2 1.98 6.59 1.98 12c0 .14.02.28.02.42.62-.27 1.29-.42 2-.42 1.66 0 3.18.83 4.1 2.15A4.01 4.01 0 0111 18c0 1.52-.87 2.83-2.12 3.51.98.32 2.03.5 3.11.5 3.5 0 6.58-1.8 8.37-4.52-2.36.23-6.98-.97-9.26-5.41z"/> <path d="M7 16h-.18C6.4 14.84 5.3 14 4 14c-1.66 0-3 1.34-3 3s1.34 3 3 3h3c1.1 0 2-.9 2-2s-.9-2-2-2z"/> 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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="#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-buffer">Class: <code>Buffer</code></a></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><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><a href="#console"><code>console</code></a></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_1"><a href="#customevent"><code>CustomEvent</code></a></span></li> <li><a href="#event"><code>Event</code></a></li> <li><a href="#eventtarget"><code>EventTarget</code></a></li> <li><a href="#exports"><code>exports</code></a></li> <li><span class="stability_1"><a href="#fetch"><code>fetch</code></a></span></li> <li><span class="stability_1"><a href="#class-formdata">Class <code>FormData</code></a></span></li> <li><a href="#global"><code>global</code></a></li> <li><span class="stability_1"><a href="#class-headers">Class <code>Headers</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><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><a href="#require"><code>require()</code></a></li> <li><span class="stability_1"><a href="#response"><code>Response</code></a></span></li> <li><span class="stability_1"><a href="#request"><code>Request</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="#subtlecrypto"><code>SubtleCrypto</code></a></span></li> <li><a href="#textdecoder"><code>TextDecoder</code></a></li> <li><a href="#textencoder"><code>TextEncoder</code></a></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> </ul> </li> </ul></div></div> </li> <li class="picker-header"> <a href="#"> <span class="collapsed-arrow">►</span><span class="expanded-arrow">▼</span> Index </a> <div class="picker"><ul> <li><a href="documentation.html" class="nav-documentation">About this documentation</a></li> <li><a href="synopsis.html" class="nav-synopsis">Usage and example</a></li> <li> <a href="index.html">Index</a> </li> </ul> <hr class="line"> <ul> <li><a href="assert.html" class="nav-assert">Assertion testing</a></li> <li><a href="async_context.html" class="nav-async_context">Asynchronous context tracking</a></li> <li><a href="async_hooks.html" class="nav-async_hooks">Async hooks</a></li> <li><a href="buffer.html" class="nav-buffer">Buffer</a></li> <li><a href="addons.html" class="nav-addons">C++ addons</a></li> <li><a href="n-api.html" class="nav-n-api">C/C++ addons with Node-API</a></li> <li><a href="embedding.html" class="nav-embedding">C++ embedder API</a></li> <li><a href="child_process.html" class="nav-child_process">Child processes</a></li> <li><a href="cluster.html" class="nav-cluster">Cluster</a></li> <li><a href="cli.html" class="nav-cli">Command-line options</a></li> <li><a href="console.html" 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API</a></li> <li><a href="webstreams.html" class="nav-webstreams">Web Streams API</a></li> <li><a href="worker_threads.html" class="nav-worker_threads">Worker threads</a></li> <li><a href="zlib.html" class="nav-zlib">Zlib</a></li> </ul> <hr class="line"> <ul> <li><a href="https://github.com/nodejs/node" class="nav-https-github-com-nodejs-node">Code repository and issue tracker</a></li> </ul></div> </li> <li class="picker-header"> <a href="#"> <span class="collapsed-arrow">►</span><span class="expanded-arrow">▼</span> Other versions </a> <div class="picker"><ol id="alt-docs"><li><a href="https://nodejs.org/docs/latest-v20.x/api/globals.html">20.x</a></li> <li><a href="https://nodejs.org/docs/latest-v19.x/api/globals.html">19.x</a></li> <li><a href="https://nodejs.org/docs/latest-v18.x/api/globals.html">18.x <b>LTS</b></a></li> <li><a href="https://nodejs.org/docs/latest-v17.x/api/globals.html">17.x</a></li> <li><a href="https://nodejs.org/docs/latest-v16.x/api/globals.html">16.x <b>LTS</b></a></li> <li><a href="https://nodejs.org/docs/latest-v15.x/api/globals.html">15.x</a></li> <li><a href="https://nodejs.org/docs/latest-v14.x/api/globals.html">14.x</a></li> <li><a href="https://nodejs.org/docs/latest-v13.x/api/globals.html">13.x</a></li> <li><a href="https://nodejs.org/docs/latest-v12.x/api/globals.html">12.x</a></li> <li><a href="https://nodejs.org/docs/latest-v11.x/api/globals.html">11.x</a></li> <li><a href="https://nodejs.org/docs/latest-v10.x/api/globals.html">10.x</a></li> <li><a href="https://nodejs.org/docs/latest-v9.x/api/globals.html">9.x</a></li> <li><a href="https://nodejs.org/docs/latest-v8.x/api/globals.html">8.x</a></li> <li><a href="https://nodejs.org/docs/latest-v7.x/api/globals.html">7.x</a></li> <li><a href="https://nodejs.org/docs/latest-v6.x/api/globals.html">6.x</a></li> <li><a href="https://nodejs.org/docs/latest-v5.x/api/globals.html">5.x</a></li> <li><a href="https://nodejs.org/docs/latest-v4.x/api/globals.html">4.x</a></li> <li><a href="https://nodejs.org/docs/latest-v0.12.x/api/globals.html">0.12.x</a></li> <li><a href="https://nodejs.org/docs/latest-v0.10.x/api/globals.html">0.10.x</a></li></ol></div> </li> <li class="picker-header"> <a href="#"> <span class="collapsed-arrow">►</span><span class="expanded-arrow">▼</span> Options </a> <div class="picker"> <ul> <li> <a href="all.html">View on single page</a> </li> <li> <a href="globals.json">View as JSON</a> </li> <li class="edit_on_github"><a href="https://github.com/nodejs/node/edit/main/doc/api/globals.md">Edit on GitHub</a></li> </ul> </div> </li> </ul> </div> <hr> </header> <details 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="#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-buffer">Class: <code>Buffer</code></a></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><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><a href="#console"><code>console</code></a></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_1"><a href="#customevent"><code>CustomEvent</code></a></span></li> <li><a href="#event"><code>Event</code></a></li> <li><a href="#eventtarget"><code>EventTarget</code></a></li> <li><a href="#exports"><code>exports</code></a></li> <li><span class="stability_1"><a href="#fetch"><code>fetch</code></a></span></li> <li><span class="stability_1"><a href="#class-formdata">Class <code>FormData</code></a></span></li> <li><a href="#global"><code>global</code></a></li> <li><span class="stability_1"><a href="#class-headers">Class <code>Headers</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><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><a href="#require"><code>require()</code></a></li> <li><span class="stability_1"><a href="#response"><code>Response</code></a></span></li> <li><span class="stability_1"><a href="#request"><code>Request</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="#subtlecrypto"><code>SubtleCrypto</code></a></span></li> <li><a href="#textdecoder"><code>TextDecoder</code></a></li> <li><a href="#textencoder"><code>TextEncoder</code></a></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> </ul> </li> </ul></details> <div 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. The following variables may appear to be global but are not. They exist only in the scope of modules, see the <a href="modules.html">module system documentation</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</td> <td><p><span>Added in: v15.0.0</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></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>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</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</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>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: 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>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</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></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</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</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: 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></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: 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>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><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>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><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><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"> <span>Added in: v16.15.0</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-global-webcrypto"><code>--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"> <span>Added in: v16.15.0</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-global-webcrypto"><code>--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"> <span>Added in: v16.15.0</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-global-webcrypto"><code>--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"> <span>Added in: v16.17.0</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-global-customevent"><code>--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><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>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"> <span>Added in: v16.15.0</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-fetch"><code>--experimental-fetch</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/fetch"><code>fetch()</code></a> function.</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"> <span>Added in: v16.15.0</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-fetch"><code>--experimental-fetch</code></a> CLI flag.</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> <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 is the global scope. This means that within the browser <code>var something</code> will define a new global variable. 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.</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"> <span>Added in: v16.15.0</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-fetch"><code>--experimental-fetch</code></a> CLI flag.</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>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>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></pre> </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"> <span>Added in: v16.15.0</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-fetch"><code>--experimental-fetch</code></a> CLI flag.</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"> <span>Added in: v16.15.0</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-fetch"><code>--experimental-fetch</code></a> CLI flag.</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>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><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"> <span>Added in: v16.15.0</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-global-webcrypto"><code>--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>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><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><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> <!-- API END --> </div> </div> </div> </body> </html>