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<!doctype html> <html lang="en"> <head> <meta charset="utf-8"> <meta name="viewport" content="width=device-width"> <title>Usage | Node.js v10.19.0 Documentation</title> <link rel="stylesheet" href="assets/style.css"> <link rel="stylesheet" href="assets/sh.css"> <link rel="canonical" href="synopsis.html"> </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 class="nav-documentation" href="documentation.html">About these Docs</a></li> <li><a class="nav-synopsis active" href="synopsis.html">Usage & Example</a></li> </ul> <div class="line"></div> <ul> <li><a class="nav-assert" href="assert.html">Assertion Testing</a></li> <li><a class="nav-async_hooks" href="async_hooks.html">Async Hooks</a></li> <li><a class="nav-buffer" href="buffer.html">Buffer</a></li> <li><a class="nav-addons" 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class="interior"> <header> <h1>Node.js v10.19.0 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="synopsis.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-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 <b>LTS</b></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 <b>LTS</b></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 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of Contents</h2> <ul> <li><a href="#synopsis_usage">Usage</a><ul> <li><a href="#synopsis_example">Example</a></li> </ul> </li> </ul> </div> <div id="apicontent"> <h1>Usage<span><a class="mark" href="#synopsis_usage" id="synopsis_usage">#</a></span></h1> <!--introduced_in=v0.10.0--> <!--type=misc--> <p><code>node [options] [V8 options] [script.js | -e "script" | - ] [arguments]</code></p> <p>Please see the <a href="cli.html#cli_command_line_options">Command Line Options</a> document for information about different options and ways to run scripts with Node.js.</p> <h2>Example<span><a class="mark" href="#synopsis_example" id="synopsis_example">#</a></span></h2> <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 displayed in this document are shown starting 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 indicate the start of each command.</p> <p>There are many tutorials and examples that follow this convention: <code>$</code> or <code>></code> for commands run as a regular user, and <code>#</code> for commands that should be executed as an administrator.</p> <p>Lines that don’t start with <code>$</code> or <code>></code> character are typically showing the output of the previous command.</p> <p>Firstly, make sure to have downloaded and installed Node.js. See <a href="https://nodejs.org/en/download/package-manager/">this guide</a> for further install information.</p> <p>Now, create an empty project folder called <code>projects</code>, then navigate into it. The project folder can be named based on the user's current project title, but this example will use <code>projects</code> as the project folder.</p> <p>Linux and Mac:</p> <pre><code class="language-console">$ mkdir ~/projects $ cd ~/projects</code></pre> <p>Windows CMD:</p> <pre><code class="language-console">> mkdir %USERPROFILE%\projects > cd %USERPROFILE%\projects</code></pre> <p>Windows PowerShell:</p> <pre><code class="language-console">> mkdir $env:USERPROFILE\projects > cd $env:USERPROFILE\projects</code></pre> <p>Next, create a new source file in the <code>projects</code> folder and call it <code>hello-world.js</code>.</p> <p>In Node.js it is considered good style to use hyphens (<code>-</code>) or underscores (<code>_</code>) to separate multiple words in filenames.</p> <p>Open <code>hello-world.js</code> in any preferred text editor and paste in the following content:</p> <pre><code class="language-js">const http = require('http'); const hostname = '127.0.0.1'; const port = 3000; const server = http.createServer((req, res) => { res.statusCode = 200; res.setHeader('Content-Type', 'text/plain'); res.end('Hello, World!\n'); }); server.listen(port, hostname, () => { console.log(`Server running at http://${hostname}:${port}/`); });</code></pre> <p>Save the file, go back to the terminal window enter the following command:</p> <pre><code class="language-console">$ node hello-world.js</code></pre> <p>An output like this should appear in the terminal to indicate Node.js server is running:</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> <p>Many of the examples in the documentation can be run similarly.</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>