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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="v16.20.0"> <title>Usage and example | Node.js v16.20.0 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/synopsis.html"> <script async defer src="assets/api.js" type="text/javascript"></script> </head> <body class="alt apidoc" id="api-section-synopsis"> <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 active">Usage and example</a></li> 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href="https://nodejs.org/docs/latest-v16.x/api/synopsis.html">16.x <b>LTS</b></a></li> <li><a href="https://nodejs.org/docs/latest-v15.x/api/synopsis.html">15.x</a></li> <li><a href="https://nodejs.org/docs/latest-v14.x/api/synopsis.html">14.x <b>LTS</b></a></li> <li><a href="https://nodejs.org/docs/latest-v13.x/api/synopsis.html">13.x</a></li> <li><a href="https://nodejs.org/docs/latest-v12.x/api/synopsis.html">12.x</a></li> <li><a href="https://nodejs.org/docs/latest-v11.x/api/synopsis.html">11.x</a></li> <li><a href="https://nodejs.org/docs/latest-v10.x/api/synopsis.html">10.x</a></li> <li><a href="https://nodejs.org/docs/latest-v9.x/api/synopsis.html">9.x</a></li> <li><a href="https://nodejs.org/docs/latest-v8.x/api/synopsis.html">8.x</a></li> <li><a href="https://nodejs.org/docs/latest-v7.x/api/synopsis.html">7.x</a></li> <li><a href="https://nodejs.org/docs/latest-v6.x/api/synopsis.html">6.x</a></li> <li><a href="https://nodejs.org/docs/latest-v5.x/api/synopsis.html">5.x</a></li> <li><a href="https://nodejs.org/docs/latest-v4.x/api/synopsis.html">4.x</a></li> <li><a href="https://nodejs.org/docs/latest-v0.12.x/api/synopsis.html">0.12.x</a></li> <li><a href="https://nodejs.org/docs/latest-v0.10.x/api/synopsis.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="synopsis.json">View as JSON</a> </li> <li class="edit_on_github"><a href="https://github.com/nodejs/node/edit/main/doc/api/synopsis.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="#usage-and-example">Usage and example</a> <ul> <li><a href="#usage">Usage</a></li> <li><a href="#example">Example</a></li> </ul> </li> </ul></details> <div id="apicontent"> <h2>Usage and example<span><a class="mark" href="#usage-and-example" id="usage-and-example">#</a></span><a aria-hidden="true" class="legacy" id="synopsis_usage_and_example"></a></h2> <section><h3>Usage<span><a class="mark" href="#usage" id="usage">#</a></span><a aria-hidden="true" class="legacy" id="synopsis_usage"></a></h3> <p><code>node [options] [V8 options] [script.js | -e "script" | - ] [arguments]</code></p> <p>Please see the <a href="cli.html#options">Command-line options</a> document for more information.</p> </section><section><h3>Example<span><a class="mark" href="#example" id="example">#</a></span><a aria-hidden="true" class="legacy" id="synopsis_example"></a></h3> <p>An example of a <a href="http.html">web server</a> written with Node.js which responds with <code>'Hello, World!'</code>:</p> <p>Commands in this document start with <code>$</code> or <code>></code> to replicate how they would appear in a user's terminal. Do not include the <code>$</code> and <code>></code> characters. They are there to show the start of each command.</p> <p>Lines that don't start with <code>$</code> or <code>></code> character show the output of the previous command.</p> <p>First, make sure to have downloaded and installed Node.js. See <a href="https://nodejs.org/en/download/package-manager/">Installing Node.js via package manager</a> for further install information.</p> <p>Now, create an empty project folder called <code>projects</code>, then navigate into it.</p> <p>Linux and Mac:</p> <pre><code class="language-console"><span class="hljs-meta prompt_">$ </span><span class="language-bash"><span class="hljs-built_in">mkdir</span> ~/projects</span> <span class="hljs-meta prompt_">$ </span><span class="language-bash"><span class="hljs-built_in">cd</span> ~/projects</span></code></pre> <p>Windows CMD:</p> <pre><code class="language-console"><span class="hljs-meta prompt_">> </span><span class="language-bash"><span class="hljs-built_in">mkdir</span> %USERPROFILE%\projects</span> <span class="hljs-meta prompt_">> </span><span class="language-bash"><span class="hljs-built_in">cd</span> %USERPROFILE%\projects</span></code></pre> <p>Windows PowerShell:</p> <pre><code class="language-console"><span class="hljs-meta prompt_">> </span><span class="language-bash"><span class="hljs-built_in">mkdir</span> <span class="hljs-variable">$env</span>:USERPROFILE\projects</span> <span class="hljs-meta prompt_">> </span><span class="language-bash"><span class="hljs-built_in">cd</span> <span class="hljs-variable">$env</span>:USERPROFILE\projects</span></code></pre> <p>Next, create a new source file in the <code>projects</code> folder and call it <code>hello-world.js</code>.</p> <p>Open <code>hello-world.js</code> in any preferred text editor and paste in the following content:</p> <pre><code class="language-js"><span class="hljs-keyword">const</span> http = <span class="hljs-built_in">require</span>(<span class="hljs-string">'node:http'</span>); <span class="hljs-keyword">const</span> hostname = <span class="hljs-string">'127.0.0.1'</span>; <span class="hljs-keyword">const</span> port = <span class="hljs-number">3000</span>; <span class="hljs-keyword">const</span> server = http.<span class="hljs-title function_">createServer</span>(<span class="hljs-function">(<span class="hljs-params">req, res</span>) =></span> { res.<span class="hljs-property">statusCode</span> = <span class="hljs-number">200</span>; res.<span class="hljs-title function_">setHeader</span>(<span class="hljs-string">'Content-Type'</span>, <span class="hljs-string">'text/plain'</span>); res.<span class="hljs-title function_">end</span>(<span class="hljs-string">'Hello, World!\n'</span>); }); server.<span class="hljs-title function_">listen</span>(port, hostname, <span class="hljs-function">() =></span> { <span class="hljs-variable language_">console</span>.<span class="hljs-title function_">log</span>(<span class="hljs-string">`Server running at http://<span class="hljs-subst">${hostname}</span>:<span class="hljs-subst">${port}</span>/`</span>); });</code></pre> <p>Save the file, go back to the terminal window, and enter the following command:</p> <pre><code class="language-console"><span class="hljs-meta prompt_">$ </span><span class="language-bash">node hello-world.js</span></code></pre> <p>Output like this should appear in the terminal:</p> <pre><code class="language-console">Server running at http://127.0.0.1:3000/</code></pre> <p>Now, open any preferred web browser and visit <code>http://127.0.0.1:3000</code>.</p> <p>If the browser displays the string <code>Hello, World!</code>, that indicates the server is working.</p></section> <!-- API END --> </div> </div> </div> </body> </html>
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