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227<li><a href="https://nodejs.org/docs/latest-v20.x/api/documentation.html">20.x <b>LTS</b></a></li> 228<li><a href="https://nodejs.org/docs/latest-v19.x/api/documentation.html">19.x</a></li> 229<li><a href="https://nodejs.org/docs/latest-v18.x/api/documentation.html">18.x <b>LTS</b></a></li> 230<li><a href="https://nodejs.org/docs/latest-v17.x/api/documentation.html">17.x</a></li> 231<li><a href="https://nodejs.org/docs/latest-v16.x/api/documentation.html">16.x</a></li> 232<li><a href="https://nodejs.org/docs/latest-v15.x/api/documentation.html">15.x</a></li> 233<li><a href="https://nodejs.org/docs/latest-v14.x/api/documentation.html">14.x</a></li> 234<li><a href="https://nodejs.org/docs/latest-v13.x/api/documentation.html">13.x</a></li> 235<li><a href="https://nodejs.org/docs/latest-v12.x/api/documentation.html">12.x</a></li> 236<li><a href="https://nodejs.org/docs/latest-v11.x/api/documentation.html">11.x</a></li> 237<li><a href="https://nodejs.org/docs/latest-v10.x/api/documentation.html">10.x</a></li> 238<li><a href="https://nodejs.org/docs/latest-v9.x/api/documentation.html">9.x</a></li> 239<li><a href="https://nodejs.org/docs/latest-v8.x/api/documentation.html">8.x</a></li> 240<li><a href="https://nodejs.org/docs/latest-v7.x/api/documentation.html">7.x</a></li> 241<li><a href="https://nodejs.org/docs/latest-v6.x/api/documentation.html">6.x</a></li> 242<li><a href="https://nodejs.org/docs/latest-v5.x/api/documentation.html">5.x</a></li> 243<li><a href="https://nodejs.org/docs/latest-v4.x/api/documentation.html">4.x</a></li> 244<li><a href="https://nodejs.org/docs/latest-v0.12.x/api/documentation.html">0.12.x</a></li> 245<li><a href="https://nodejs.org/docs/latest-v0.10.x/api/documentation.html">0.10.x</a></li></ol></div> 246 </li> 247 248 <li class="picker-header"> 249 <a href="#"> 250 <span class="collapsed-arrow">►</span><span class="expanded-arrow">▼</span> 251 Options 252 </a> 253 254 <div class="picker"> 255 <ul> 256 <li> 257 <a href="all.html">View on single page</a> 258 </li> 259 <li> 260 <a href="documentation.json">View as JSON</a> 261 </li> 262 <li class="edit_on_github"><a href="https://github.com/nodejs/node/edit/main/doc/api/documentation.md">Edit on GitHub</a></li> 263 </ul> 264 </div> 265 </li> 266 </ul> 267 </div> 268 <hr> 269 </header> 270 271 <details id="toc" open><summary>Table of contents</summary><ul> 272<li><a href="#about-this-documentation">About this documentation</a> 273<ul> 274<li><a href="#contributing">Contributing</a></li> 275<li><a href="#stability-index">Stability index</a></li> 276<li><a href="#stability-overview">Stability overview</a></li> 277<li><a href="#json-output">JSON output</a></li> 278<li><a href="#system-calls-and-man-pages">System calls and man pages</a></li> 279</ul> 280</li> 281</ul></details> 282 283 <div id="apicontent"> 284 <h2>About this documentation<span><a class="mark" href="#about-this-documentation" id="about-this-documentation">#</a></span><a aria-hidden="true" class="legacy" id="documentation_about_this_documentation"></a></h2> 285 286 287<p>Welcome to the official API reference documentation for Node.js!</p> 288<p>Node.js is a JavaScript runtime built on the <a href="https://v8.dev/">V8 JavaScript engine</a>.</p> 289<section><h3>Contributing<span><a class="mark" href="#contributing" id="contributing">#</a></span><a aria-hidden="true" class="legacy" id="documentation_contributing"></a></h3> 290<p>Report errors in this documentation in <a href="https://github.com/nodejs/node/issues/new">the issue tracker</a>. See 291<a href="https://github.com/nodejs/node/blob/HEAD/CONTRIBUTING.md">the contributing guide</a> for directions on how to submit pull requests.</p> 292</section><section><h3>Stability index<span><a class="mark" href="#stability-index" id="stability-index">#</a></span><a aria-hidden="true" class="legacy" id="documentation_stability_index"></a></h3> 293 294<p>Throughout the documentation are indications of a section's stability. Some APIs 295are so proven and so relied upon that they are unlikely to ever change at all. 296Others are brand new and experimental, or known to be hazardous.</p> 297<p>The stability indices are as follows:</p> 298<p></p><div class="api_stability api_stability_0">Stability: 0 - Deprecated. The feature may emit warnings. Backward 299compatibility is not guaranteed.</div><p></p> 300<!-- separator --> 301<p></p><div class="api_stability api_stability_1">Stability: 1 - Experimental. The feature is not subject to 302<a href="https://semver.org/">semantic versioning</a> rules. Non-backward compatible changes or removal may 303occur in any future release. Use of the feature is not recommended in 304production environments.</div><p></p> 305<!-- separator --> 306<p></p><div class="api_stability api_stability_2">Stability: 2 - Stable. Compatibility with the npm ecosystem is a high 307priority.</div><p></p> 308<!-- separator --> 309<p></p><div class="api_stability api_stability_3">Stability: 3 - Legacy. Although this feature is unlikely to be removed and is 310still covered by semantic versioning guarantees, it is no longer actively 311maintained, and other alternatives are available.</div><p></p> 312<p>Features are marked as legacy rather than being deprecated if their use does no 313harm, and they are widely relied upon within the npm ecosystem. Bugs found in 314legacy features are unlikely to be fixed.</p> 315<p>Use caution when making use of Experimental features, particularly within 316modules. Users may not be aware that experimental features are being used. 317Bugs or behavior changes may surprise users when Experimental API 318modifications occur. To avoid surprises, use of an Experimental feature may need 319a command-line flag. Experimental features may also emit a <a href="process.html#event-warning">warning</a>.</p> 320</section><section><h3>Stability overview<span><a class="mark" href="#stability-overview" id="stability-overview">#</a></span><a aria-hidden="true" class="legacy" id="documentation_stability_overview"></a></h3> 321<!-- STABILITY_OVERVIEW_SLOT_BEGIN --><table><thead><tr><th>API</th><th>Stability</th></tr></thead><tbody><tr><td class="module_stability"><a href="assert.html">Assert</a></td><td class="api_stability api_stability_2">(2) Stable</td></tr><tr><td class="module_stability"><a href="async_hooks.html">Async hooks</a></td><td class="api_stability api_stability_1">(1) Experimental</td></tr><tr><td class="module_stability"><a href="async_context.html">Asynchronous context tracking</a></td><td class="api_stability api_stability_2">(2) Stable</td></tr><tr><td class="module_stability"><a href="buffer.html">Buffer</a></td><td class="api_stability api_stability_2">(2) Stable</td></tr><tr><td class="module_stability"><a href="child_process.html">Child process</a></td><td class="api_stability api_stability_2">(2) Stable</td></tr><tr><td class="module_stability"><a href="cluster.html">Cluster</a></td><td class="api_stability api_stability_2">(2) Stable</td></tr><tr><td class="module_stability"><a href="console.html">Console</a></td><td class="api_stability api_stability_2">(2) Stable</td></tr><tr><td class="module_stability"><a href="crypto.html">Crypto</a></td><td class="api_stability api_stability_2">(2) Stable</td></tr><tr><td class="module_stability"><a href="diagnostics_channel.html">Diagnostics Channel</a></td><td class="api_stability api_stability_2">(2) Stable</td></tr><tr><td class="module_stability"><a href="dns.html">DNS</a></td><td class="api_stability api_stability_2">(2) Stable</td></tr><tr><td class="module_stability"><a href="domain.html">Domain</a></td><td class="api_stability api_stability_0">(0) Deprecated</td></tr><tr><td class="module_stability"><a href="fs.html">File system</a></td><td class="api_stability api_stability_2">(2) Stable</td></tr><tr><td class="module_stability"><a href="http.html">HTTP</a></td><td class="api_stability api_stability_2">(2) Stable</td></tr><tr><td class="module_stability"><a href="http2.html">HTTP/2</a></td><td class="api_stability api_stability_2">(2) Stable</td></tr><tr><td class="module_stability"><a href="https.html">HTTPS</a></td><td class="api_stability api_stability_2">(2) Stable</td></tr><tr><td class="module_stability"><a href="inspector.html">Inspector</a></td><td class="api_stability api_stability_2">(2) Stable</td></tr><tr><td class="module_stability"><a href="module.html">Modules: <code>node:module</code> API</a></td><td class="api_stability api_stability_1">(1) .1 - Active development</td></tr><tr><td class="module_stability"><a href="modules.html">Modules: CommonJS modules</a></td><td class="api_stability api_stability_2">(2) Stable</td></tr><tr><td class="module_stability"><a href="os.html">OS</a></td><td class="api_stability api_stability_2">(2) Stable</td></tr><tr><td class="module_stability"><a href="path.html">Path</a></td><td class="api_stability api_stability_2">(2) Stable</td></tr><tr><td class="module_stability"><a href="perf_hooks.html">Performance measurement APIs</a></td><td class="api_stability api_stability_2">(2) Stable</td></tr><tr><td class="module_stability"><a href="punycode.html">Punycode</a></td><td class="api_stability api_stability_0">(0) Deprecated</td></tr><tr><td class="module_stability"><a href="querystring.html">Query string</a></td><td class="api_stability api_stability_2">(2) Stable</td></tr><tr><td class="module_stability"><a href="readline.html">Readline</a></td><td class="api_stability api_stability_2">(2) Stable</td></tr><tr><td class="module_stability"><a href="repl.html">REPL</a></td><td class="api_stability api_stability_2">(2) Stable</td></tr><tr><td class="module_stability"><a href="single-executable-applications.html">Single executable applications</a></td><td class="api_stability api_stability_1">(1) Experimental: This feature is being designed and will change.</td></tr><tr><td class="module_stability"><a href="stream.html">Stream</a></td><td class="api_stability api_stability_2">(2) Stable</td></tr><tr><td class="module_stability"><a href="string_decoder.html">String decoder</a></td><td class="api_stability api_stability_2">(2) Stable</td></tr><tr><td class="module_stability"><a href="test.html">Test runner</a></td><td class="api_stability api_stability_1">(1) Experimental</td></tr><tr><td class="module_stability"><a href="timers.html">Timers</a></td><td class="api_stability api_stability_2">(2) Stable</td></tr><tr><td class="module_stability"><a href="tls.html">TLS (SSL)</a></td><td class="api_stability api_stability_2">(2) Stable</td></tr><tr><td class="module_stability"><a href="tracing.html">Trace events</a></td><td class="api_stability api_stability_1">(1) Experimental</td></tr><tr><td class="module_stability"><a href="tty.html">TTY</a></td><td class="api_stability api_stability_2">(2) Stable</td></tr><tr><td class="module_stability"><a href="dgram.html">UDP/datagram sockets</a></td><td class="api_stability api_stability_2">(2) Stable</td></tr><tr><td class="module_stability"><a href="url.html">URL</a></td><td class="api_stability api_stability_2">(2) Stable</td></tr><tr><td class="module_stability"><a href="util.html">Util</a></td><td class="api_stability api_stability_2">(2) Stable</td></tr><tr><td class="module_stability"><a href="vm.html">VM (executing JavaScript)</a></td><td class="api_stability api_stability_2">(2) Stable</td></tr><tr><td class="module_stability"><a href="webcrypto.html">Web Crypto API</a></td><td class="api_stability api_stability_1">(1) Experimental</td></tr><tr><td class="module_stability"><a href="webstreams.html">Web Streams API</a></td><td class="api_stability api_stability_1">(1) Experimental.</td></tr><tr><td class="module_stability"><a href="wasi.html">WebAssembly System Interface (WASI)</a></td><td class="api_stability api_stability_1">(1) Experimental</td></tr><tr><td class="module_stability"><a href="worker_threads.html">Worker threads</a></td><td class="api_stability api_stability_2">(2) Stable</td></tr><tr><td class="module_stability"><a href="zlib.html">Zlib</a></td><td class="api_stability api_stability_2">(2) Stable</td></tr></tbody></table><!-- STABILITY_OVERVIEW_SLOT_END --> 322</section><section><h3>JSON output<span><a class="mark" href="#json-output" id="json-output">#</a></span><a aria-hidden="true" class="legacy" id="documentation_json_output"></a></h3> 323<div class="api_metadata"> 324<span>Added in: v0.6.12</span> 325</div> 326<p>Every <code>.html</code> document has a corresponding <code>.json</code> document. This is for IDEs 327and other utilities that consume the documentation.</p> 328</section><section><h3>System calls and man pages<span><a class="mark" href="#system-calls-and-man-pages" id="system-calls-and-man-pages">#</a></span><a aria-hidden="true" class="legacy" id="documentation_system_calls_and_man_pages"></a></h3> 329<p>Node.js functions which wrap a system call will document that. The docs link 330to the corresponding man pages which describe how the system call works.</p> 331<p>Most Unix system calls have Windows analogues. Still, behavior differences may 332be unavoidable.</p></section> 333 <!-- API END --> 334 </div> 335 </div> 336 </div> 337</body> 338</html> 339