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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>Modules: node:module API | 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/module.html"> <script async defer src="assets/api.js" type="text/javascript"></script> <style>@media(max-width:430px){.with-26-chars>.js-flavor-selector{float:none;margin:0 0 1em auto;}}</style> </head> <body class="alt apidoc" id="api-section-module"> <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 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href="#the-module-object">The <code>Module</code> object</a> <ul> <li><a href="#modulebuiltinmodules"><code>module.builtinModules</code></a></li> <li><a href="#modulecreaterequirefilename"><code>module.createRequire(filename)</code></a></li> <li><a href="#moduleisbuiltinmodulename"><code>module.isBuiltin(moduleName)</code></a></li> <li><a href="#modulesyncbuiltinesmexports"><code>module.syncBuiltinESMExports()</code></a></li> </ul> </li> <li><span class="stability_1"><a href="#source-map-v3-support">Source map v3 support</a></span> <ul> <li><a href="#modulefindsourcemappath"><code>module.findSourceMap(path)</code></a></li> <li><a href="#class-modulesourcemap">Class: <code>module.SourceMap</code></a> <ul> <li><a href="#new-sourcemappayload"><code>new SourceMap(payload)</code></a></li> <li><a href="#sourcemappayload"><code>sourceMap.payload</code></a></li> <li><a href="#sourcemapfindentrylinenumber-columnnumber"><code>sourceMap.findEntry(lineNumber, columnNumber)</code></a></li> </ul> 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href="https://nodejs.org/docs/latest-v18.x/api/module.html">18.x <b>LTS</b></a></li> <li><a href="https://nodejs.org/docs/latest-v17.x/api/module.html">17.x</a></li> <li><a href="https://nodejs.org/docs/latest-v16.x/api/module.html">16.x <b>LTS</b></a></li> <li><a href="https://nodejs.org/docs/latest-v15.x/api/module.html">15.x</a></li> <li><a href="https://nodejs.org/docs/latest-v14.x/api/module.html">14.x</a></li> <li><a href="https://nodejs.org/docs/latest-v13.x/api/module.html">13.x</a></li> <li><a href="https://nodejs.org/docs/latest-v12.x/api/module.html">12.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="module.json">View as JSON</a> </li> <li class="edit_on_github"><a href="https://github.com/nodejs/node/edit/main/doc/api/module.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="#modules-nodemodule-api">Modules: <code>node:module</code> API</a> <ul> <li><a href="#the-module-object">The <code>Module</code> object</a> <ul> <li><a href="#modulebuiltinmodules"><code>module.builtinModules</code></a></li> <li><a href="#modulecreaterequirefilename"><code>module.createRequire(filename)</code></a></li> <li><a href="#moduleisbuiltinmodulename"><code>module.isBuiltin(moduleName)</code></a></li> <li><a href="#modulesyncbuiltinesmexports"><code>module.syncBuiltinESMExports()</code></a></li> </ul> </li> <li><span class="stability_1"><a href="#source-map-v3-support">Source map v3 support</a></span> <ul> <li><a href="#modulefindsourcemappath"><code>module.findSourceMap(path)</code></a></li> <li><a href="#class-modulesourcemap">Class: <code>module.SourceMap</code></a> <ul> <li><a href="#new-sourcemappayload"><code>new SourceMap(payload)</code></a></li> <li><a href="#sourcemappayload"><code>sourceMap.payload</code></a></li> <li><a href="#sourcemapfindentrylinenumber-columnnumber"><code>sourceMap.findEntry(lineNumber, columnNumber)</code></a></li> </ul> </li> </ul> </li> </ul> </li> </ul></details> <div id="apicontent"> <h2>Modules: <code>node:module</code> API<span><a class="mark" href="#modules-nodemodule-api" id="modules-nodemodule-api">#</a></span><a aria-hidden="true" class="legacy" id="module_modules_node_module_api"></a></h2> <div class="api_metadata"> <span>Added in: v0.3.7</span> </div> <section><h3>The <code>Module</code> object<span><a class="mark" href="#the-module-object" id="the-module-object">#</a></span><a aria-hidden="true" class="legacy" id="module_the_module_object"></a></h3> <ul> <li><a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object" class="type"><Object></a></li> </ul> <p>Provides general utility methods when interacting with instances of <code>Module</code>, the <a href="modules.html#the-module-object"><code>module</code></a> variable often seen in <a href="modules.html">CommonJS</a> modules. Accessed via <code>import 'node:module'</code> or <code>require('node:module')</code>.</p> <h4><code>module.builtinModules</code><span><a class="mark" href="#modulebuiltinmodules" id="modulebuiltinmodules">#</a></span><a aria-hidden="true" class="legacy" id="module_module_builtinmodules"></a></h4> <div class="api_metadata"> <span>Added in: v9.3.0, v8.10.0, v6.13.0</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>A list of the names of all modules provided by Node.js. Can be used to verify if a module is maintained by a third party or not.</p> <p><code>module</code> in this context isn't the same object that's provided by the <a href="modules.html#the-module-wrapper">module wrapper</a>. To access it, require the <code>Module</code> module:</p> <pre class="with-26-chars"><input class="js-flavor-selector" type="checkbox" checked aria-label="Show modern ES modules syntax"><code class="language-js mjs"><span class="hljs-comment">// module.mjs</span> <span class="hljs-comment">// In an ECMAScript module</span> <span class="hljs-keyword">import</span> { builtinModules <span class="hljs-keyword">as</span> builtin } <span class="hljs-keyword">from</span> <span class="hljs-string">'node:module'</span>;</code><code class="language-js cjs"><span class="hljs-comment">// module.cjs</span> <span class="hljs-comment">// In a CommonJS module</span> <span class="hljs-keyword">const</span> builtin = <span class="hljs-built_in">require</span>(<span class="hljs-string">'node:module'</span>).<span class="hljs-property">builtinModules</span>;</code></pre> <h4><code>module.createRequire(filename)</code><span><a class="mark" href="#modulecreaterequirefilename" id="modulecreaterequirefilename">#</a></span><a aria-hidden="true" class="legacy" id="module_module_createrequire_filename"></a></h4> <div class="api_metadata"> <span>Added in: v12.2.0</span> </div> <ul> <li><code>filename</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a> | <a href="url.html#the-whatwg-url-api" class="type"><URL></a> Filename to be used to construct the require function. Must be a file URL object, file URL string, or absolute path string.</li> <li>Returns: <a href="modules.html#requireid" class="type"><require></a> Require function</li> </ul> <pre><code class="language-js mjs"><span class="hljs-keyword">import</span> { createRequire } <span class="hljs-keyword">from</span> <span class="hljs-string">'node:module'</span>; <span class="hljs-keyword">const</span> <span class="hljs-built_in">require</span> = <span class="hljs-title function_">createRequire</span>(<span class="hljs-keyword">import</span>.<span class="hljs-property">meta</span>.<span class="hljs-property">url</span>); <span class="hljs-comment">// sibling-module.js is a CommonJS module.</span> <span class="hljs-keyword">const</span> siblingModule = <span class="hljs-built_in">require</span>(<span class="hljs-string">'./sibling-module'</span>);</code></pre> <h4><code>module.isBuiltin(moduleName)</code><span><a class="mark" href="#moduleisbuiltinmodulename" id="moduleisbuiltinmodulename">#</a></span><a aria-hidden="true" class="legacy" id="module_module_isbuiltin_modulename"></a></h4> <div class="api_metadata"> <span>Added in: v16.17.0</span> </div> <ul> <li><code>moduleName</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a> name of the module</li> <li>Returns: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Boolean_type" class="type"><boolean></a> returns true if the module is builtin else returns false</li> </ul> <pre><code class="language-js mjs"><span class="hljs-keyword">import</span> { isBuiltin } <span class="hljs-keyword">from</span> <span class="hljs-string">'node:module'</span>; <span class="hljs-title function_">isBuiltin</span>(<span class="hljs-string">'node:fs'</span>); <span class="hljs-comment">// true</span> <span class="hljs-title function_">isBuiltin</span>(<span class="hljs-string">'fs'</span>); <span class="hljs-comment">// true</span> <span class="hljs-title function_">isBuiltin</span>(<span class="hljs-string">'wss'</span>); <span class="hljs-comment">// false</span></code></pre> <h4><code>module.syncBuiltinESMExports()</code><span><a class="mark" href="#modulesyncbuiltinesmexports" id="modulesyncbuiltinesmexports">#</a></span><a aria-hidden="true" class="legacy" id="module_module_syncbuiltinesmexports"></a></h4> <div class="api_metadata"> <span>Added in: v12.12.0</span> </div> <p>The <code>module.syncBuiltinESMExports()</code> method updates all the live bindings for builtin <a href="esm.html">ES Modules</a> to match the properties of the <a href="modules.html">CommonJS</a> exports. It does not add or remove exported names from the <a href="esm.html">ES Modules</a>.</p> <pre><code class="language-js"><span class="hljs-keyword">const</span> fs = <span class="hljs-built_in">require</span>(<span class="hljs-string">'node:fs'</span>); <span class="hljs-keyword">const</span> assert = <span class="hljs-built_in">require</span>(<span class="hljs-string">'node:assert'</span>); <span class="hljs-keyword">const</span> { syncBuiltinESMExports } = <span class="hljs-built_in">require</span>(<span class="hljs-string">'node:module'</span>); fs.<span class="hljs-property">readFile</span> = newAPI; <span class="hljs-keyword">delete</span> fs.<span class="hljs-property">readFileSync</span>; <span class="hljs-keyword">function</span> <span class="hljs-title function_">newAPI</span>(<span class="hljs-params"></span>) { <span class="hljs-comment">// ...</span> } fs.<span class="hljs-property">newAPI</span> = newAPI; <span class="hljs-title function_">syncBuiltinESMExports</span>(); <span class="hljs-title function_">import</span>(<span class="hljs-string">'node:fs'</span>).<span class="hljs-title function_">then</span>(<span class="hljs-function">(<span class="hljs-params">esmFS</span>) =></span> { <span class="hljs-comment">// It syncs the existing readFile property with the new value</span> assert.<span class="hljs-title function_">strictEqual</span>(esmFS.<span class="hljs-property">readFile</span>, newAPI); <span class="hljs-comment">// readFileSync has been deleted from the required fs</span> assert.<span class="hljs-title function_">strictEqual</span>(<span class="hljs-string">'readFileSync'</span> <span class="hljs-keyword">in</span> fs, <span class="hljs-literal">false</span>); <span class="hljs-comment">// syncBuiltinESMExports() does not remove readFileSync from esmFS</span> assert.<span class="hljs-title function_">strictEqual</span>(<span class="hljs-string">'readFileSync'</span> <span class="hljs-keyword">in</span> esmFS, <span class="hljs-literal">true</span>); <span class="hljs-comment">// syncBuiltinESMExports() does not add names</span> assert.<span class="hljs-title function_">strictEqual</span>(esmFS.<span class="hljs-property">newAPI</span>, <span class="hljs-literal">undefined</span>); });</code></pre> </section><section><h3>Source map v3 support<span><a class="mark" href="#source-map-v3-support" id="source-map-v3-support">#</a></span><a aria-hidden="true" class="legacy" id="module_source_map_v3_support"></a></h3> <div class="api_metadata"> <span>Added in: v13.7.0, v12.17.0</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>Helpers for interacting with the source map cache. This cache is populated when source map parsing is enabled and <a href="https://sourcemaps.info/spec.html#h.lmz475t4mvbx">source map include directives</a> are found in a modules' footer.</p> <p>To enable source map parsing, Node.js must be run with the flag <a href="cli.html#--enable-source-maps"><code>--enable-source-maps</code></a>, or with code coverage enabled by setting <a href="cli.html#node_v8_coveragedir"><code>NODE_V8_COVERAGE=dir</code></a>.</p> <pre class="with-26-chars"><input class="js-flavor-selector" type="checkbox" checked aria-label="Show modern ES modules syntax"><code class="language-js mjs"><span class="hljs-comment">// module.mjs</span> <span class="hljs-comment">// In an ECMAScript module</span> <span class="hljs-keyword">import</span> { findSourceMap, <span class="hljs-title class_">SourceMap</span> } <span class="hljs-keyword">from</span> <span class="hljs-string">'node:module'</span>;</code><code class="language-js cjs"><span class="hljs-comment">// module.cjs</span> <span class="hljs-comment">// In a CommonJS module</span> <span class="hljs-keyword">const</span> { findSourceMap, <span class="hljs-title class_">SourceMap</span> } = <span class="hljs-built_in">require</span>(<span class="hljs-string">'node:module'</span>);</code></pre> <!-- Anchors to make sure old links find a target --> <p><a id="module_module_findsourcemap_path_error"></a></p> <h4><code>module.findSourceMap(path)</code><span><a class="mark" href="#modulefindsourcemappath" id="modulefindsourcemappath">#</a></span><a aria-hidden="true" class="legacy" id="module_module_findsourcemap_path"></a></h4> <div class="api_metadata"> <span>Added in: v13.7.0, v12.17.0</span> </div> <ul> <li><code>path</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a></li> <li>Returns: <a href="module.html#class-modulesourcemap" class="type"><module.SourceMap></a></li> </ul> <p><code>path</code> is the resolved path for the file for which a corresponding source map should be fetched.</p> <h4>Class: <code>module.SourceMap</code><span><a class="mark" href="#class-modulesourcemap" id="class-modulesourcemap">#</a></span><a aria-hidden="true" class="legacy" id="module_class_module_sourcemap"></a></h4> <div class="api_metadata"> <span>Added in: v13.7.0, v12.17.0</span> </div> <h5><code>new SourceMap(payload)</code><span><a class="mark" href="#new-sourcemappayload" id="new-sourcemappayload">#</a></span><a aria-hidden="true" class="legacy" id="module_new_sourcemap_payload"></a></h5> <ul> <li><code>payload</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object" class="type"><Object></a></li> </ul> <p>Creates a new <code>sourceMap</code> instance.</p> <p><code>payload</code> is an object with keys matching the <a href="https://sourcemaps.info/spec.html#h.mofvlxcwqzej">Source map v3 format</a>:</p> <ul> <li><code>file</code>: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a></li> <li><code>version</code>: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type" class="type"><number></a></li> <li><code>sources</code>: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string[]></a></li> <li><code>sourcesContent</code>: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string[]></a></li> <li><code>names</code>: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string[]></a></li> <li><code>mappings</code>: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a></li> <li><code>sourceRoot</code>: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a></li> </ul> <h5><code>sourceMap.payload</code><span><a class="mark" href="#sourcemappayload" id="sourcemappayload">#</a></span><a aria-hidden="true" class="legacy" id="module_sourcemap_payload"></a></h5> <ul> <li>Returns: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object" class="type"><Object></a></li> </ul> <p>Getter for the payload used to construct the <a href="#class-modulesourcemap"><code>SourceMap</code></a> instance.</p> <h5><code>sourceMap.findEntry(lineNumber, columnNumber)</code><span><a class="mark" href="#sourcemapfindentrylinenumber-columnnumber" id="sourcemapfindentrylinenumber-columnnumber">#</a></span><a aria-hidden="true" class="legacy" id="module_sourcemap_findentry_linenumber_columnnumber"></a></h5> <ul> <li><code>lineNumber</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type" class="type"><number></a></li> <li><code>columnNumber</code> <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type" class="type"><number></a></li> <li>Returns: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object" class="type"><Object></a></li> </ul> <p>Given a line number and column number in the generated source file, returns an object representing the position in the original file. The object returned consists of the following keys:</p> <ul> <li>generatedLine: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type" class="type"><number></a></li> <li>generatedColumn: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type" class="type"><number></a></li> <li>originalSource: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a></li> <li>originalLine: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type" class="type"><number></a></li> <li>originalColumn: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#Number_type" class="type"><number></a></li> <li>name: <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Data_structures#String_type" class="type"><string></a></li> </ul></section> <!-- API END --> </div> </div> </div> </body> </html>