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<!doctype html> <html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width"> <title>About this Documentation | Node.js v10.24.1 Documentation</title> <link rel="stylesheet" href="https://fonts.googleapis.com/css?family=Lato:400,700,400italic"> <link rel="stylesheet" href="assets/style.css"> <link rel="stylesheet" href="assets/sh.css"> <link rel="canonical" href="https://nodejs.org/api/documentation.html"> </head> <body class="alt apidoc" id="api-section-documentation"> <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 active">About these Docs</a></li> <li><a href="synopsis.html" class="nav-synopsis">Usage & Example</a></li> </ul> <div class="line"></div> <ul> <li><a href="assert.html" class="nav-assert">Assertion Testing</a></li> <li><a href="async_hooks.html" 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<li><a href="readline.html" class="nav-readline">Readline</a></li> <li><a href="repl.html" class="nav-repl">REPL</a></li> <li><a href="stream.html" class="nav-stream">Stream</a></li> <li><a href="string_decoder.html" class="nav-string_decoder">String Decoder</a></li> <li><a href="timers.html" class="nav-timers">Timers</a></li> <li><a href="tls.html" class="nav-tls">TLS/SSL</a></li> <li><a href="tracing.html" class="nav-tracing">Trace Events</a></li> <li><a href="tty.html" class="nav-tty">TTY</a></li> <li><a href="dgram.html" class="nav-dgram">UDP/Datagram</a></li> <li><a href="url.html" class="nav-url">URL</a></li> <li><a href="util.html" class="nav-util">Utilities</a></li> <li><a href="v8.html" class="nav-v8">V8</a></li> <li><a href="vm.html" class="nav-vm">VM</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> <div class="line"></div> <ul> <li><a href="https://github.com/nodejs/node" class="nav-https-github-com-nodejs-node">GitHub Repo & Issue Tracker</a></li> </ul> </div> <div id="column1" data-id="documentation" class="interior"> <header> <h1>Node.js v10.24.1 Documentation</h1> <div id="gtoc"> <ul> <li> <a href="index.html" name="toc">Index</a> </li> <li> <a href="all.html">View on single page</a> </li> <li> <a href="documentation.json">View as JSON</a> </li> <li class="version-picker"> <a href="#">View another version <span>▼</span></a> <ol class="version-picker"><li><a href="https://nodejs.org/docs/latest-v15.x/api/documentation.html">15.x</a></li> <li><a href="https://nodejs.org/docs/latest-v14.x/api/documentation.html">14.x <b>LTS</b></a></li> <li><a href="https://nodejs.org/docs/latest-v13.x/api/documentation.html">13.x</a></li> <li><a href="https://nodejs.org/docs/latest-v12.x/api/documentation.html">12.x <b>LTS</b></a></li> <li><a href="https://nodejs.org/docs/latest-v11.x/api/documentation.html">11.x</a></li> <li><a href="https://nodejs.org/docs/latest-v10.x/api/documentation.html">10.x <b>LTS</b></a></li> <li><a href="https://nodejs.org/docs/latest-v9.x/api/documentation.html">9.x</a></li> <li><a href="https://nodejs.org/docs/latest-v8.x/api/documentation.html">8.x</a></li> <li><a href="https://nodejs.org/docs/latest-v7.x/api/documentation.html">7.x</a></li> <li><a href="https://nodejs.org/docs/latest-v6.x/api/documentation.html">6.x</a></li> <li><a href="https://nodejs.org/docs/latest-v5.x/api/documentation.html">5.x</a></li> <li><a href="https://nodejs.org/docs/latest-v4.x/api/documentation.html">4.x</a></li> <li><a href="https://nodejs.org/docs/latest-v0.12.x/api/documentation.html">0.12.x</a></li> <li><a href="https://nodejs.org/docs/latest-v0.10.x/api/documentation.html">0.10.x</a></li></ol> </li> <li class="edit_on_github"><a href="https://github.com/nodejs/node/edit/master/doc/api/documentation.md"><span class="github_icon"><svg height="16" width="16" viewBox="0 0 16.1 16.1" fill="currentColor"><path d="M8 0a8 8 0 0 0-2.5 15.6c.4 0 .5-.2.5-.4v-1.5c-2 .4-2.5-.5-2.7-1 0-.1-.5-.9-.8-1-.3-.2-.7-.6 0-.6.6 0 1 .6 1.2.8.7 1.2 1.9 1 2.4.7 0-.5.2-.9.5-1-1.8-.3-3.7-1-3.7-4 0-.9.3-1.6.8-2.2 0-.2-.3-1 .1-2 0 0 .7-.3 2.2.7a7.4 7.4 0 0 1 4 0c1.5-1 2.2-.8 2.2-.8.5 1.1.2 2 .1 2.1.5.6.8 1.3.8 2.2 0 3-1.9 3.7-3.6 4 .3.2.5.7.5 1.4v2.2c0 .2.1.5.5.4A8 8 0 0 0 16 8a8 8 0 0 0-8-8z"/></svg></span>Edit on GitHub</a></li> </ul> </div> <hr> </header> <div id="toc"> <h2>Table of Contents</h2> <ul> <li> <p><a href="#documentation_about_this_documentation">About this Documentation</a></p> <ul> <li><a href="#documentation_contributing">Contributing</a></li> <li><a href="#documentation_stability_index">Stability Index</a></li> <li><span class="stability_1"><a href="#documentation_json_output">JSON Output</a></span></li> <li><a href="#documentation_syscalls_and_man_pages">Syscalls and man pages</a></li> </ul> </li> </ul> </div> <div id="apicontent"> <h1>About this Documentation<span><a class="mark" href="#documentation_about_this_documentation" id="documentation_about_this_documentation">#</a></span></h1> <p>The goal of this documentation is to comprehensively explain the Node.js API, both from a reference as well as a conceptual point of view. Each section describes a built-in module or high-level concept.</p> <p>Where appropriate, property types, method arguments, and the arguments provided to event handlers are detailed in a list underneath the topic heading.</p> <h2>Contributing<span><a class="mark" href="#documentation_contributing" id="documentation_contributing">#</a></span></h2> <p>If errors are found in this documentation, please <a href="https://github.com/nodejs/node/issues/new">submit an issue</a> or see <a href="https://github.com/nodejs/node/blob/master/CONTRIBUTING.md">the contributing guide</a> for directions on how to submit a patch.</p> <p>Every file is generated based on the corresponding <code>.md</code> file in the <code>doc/api/</code> folder in Node.js's source tree. The documentation is generated using the <code>tools/doc/generate.js</code> program. An HTML template is located at <code>doc/template.html</code>.</p> <h2>Stability Index<span><a class="mark" href="#documentation_stability_index" id="documentation_stability_index">#</a></span></h2> <p>Throughout the documentation are indications of a section's stability. The Node.js API is still somewhat changing, and as it matures, certain parts are more reliable than others. Some are so proven, and so relied upon, that they are unlikely to ever change at all. Others are brand new and experimental, or known to be hazardous and in the process of being redesigned.</p> <p>The stability indices are as follows:</p> <p></p><div class="api_stability api_stability_0">Stability: 0 - Deprecated. The feature may emit warnings. Backward compatibility is not guaranteed.</div><p></p> <!-- separator --> <p></p><div class="api_stability api_stability_1">Stability: 1 - Experimental. This feature is still under active development and subject to non-backward compatible changes or removal in any future version. Use of the feature is not recommended in production environments. Experimental features are not subject to the Node.js Semantic Versioning model.</div><p></p> <!-- separator --> <p></p><div class="api_stability api_stability_2">Stability: 2 - Stable. Compatibility with the npm ecosystem is a high priority.</div><p></p> <p>Caution must be used when making use of <code>Experimental</code> features, particularly within modules that may be used as dependencies (or dependencies of dependencies) within a Node.js application. End users may not be aware that experimental features are being used, and therefore may experience unexpected failures or behavior changes when API modifications occur. To help avoid such surprises, <code>Experimental</code> features may require a command-line flag to explicitly enable them, or may cause a process warning to be emitted. By default, such warnings are printed to <a href="process.html#process_process_stderr"><code>stderr</code></a> and may be handled by attaching a listener to the <a href="process.html#process_event_warning"><code>'warning'</code></a> event.</p> <h2>JSON Output<span><a class="mark" href="#documentation_json_output" id="documentation_json_output">#</a></span></h2> <div class="api_metadata"> <span>Added in: v0.6.12</span> </div> <p></p><div class="api_stability api_stability_1"><a href="documentation.html#documentation_stability_index">Stability: 1</a> - Experimental</div><p></p> <p>Every <code>.html</code> document has a corresponding <code>.json</code> document presenting the same information in a structured manner. This feature is experimental, and added for the benefit of IDEs and other utilities that wish to do programmatic things with the documentation.</p> <h2>Syscalls and man pages<span><a class="mark" href="#documentation_syscalls_and_man_pages" id="documentation_syscalls_and_man_pages">#</a></span></h2> <p>System calls like <a href="http://man7.org/linux/man-pages/man2/open.2.html"><code>open(2)</code></a> and <a href="http://man7.org/linux/man-pages/man2/read.2.html"><code>read(2)</code></a> define the interface between user programs and the underlying operating system. Node.js functions which simply wrap a syscall, like <a href="fs.html#fs_fs_open_path_flags_mode_callback"><code>fs.open()</code></a>, will document that. The docs link to the corresponding man pages (short for manual pages) which describe how the syscalls work.</p> <p>Most Unix syscalls have Windows equivalents, but behavior may differ on Windows relative to Linux and macOS. For an example of the subtle ways in which it's sometimes impossible to replace Unix syscall semantics on Windows, see <a href="https://github.com/nodejs/node/issues/4760">Node.js issue 4760</a>.</p> </div> </div> </div> <script src="assets/sh_main.js"></script> <script src="assets/sh_javascript.min.js"></script> <script>highlight(undefined, undefined, 'pre');</script> </body> </html>