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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 v8.10.0 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" href="addons.html">C++ Addons</a></li> <li><a class="nav-n-api" href="n-api.html">C/C++ Addons - 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] [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> <pre><code class="lang-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>To run the server, put the code into a file called <code>example.js</code> and execute it with Node.js:</p> <pre><code class="lang-txt">$ node example.js Server running at http://127.0.0.1:3000/ </code></pre> <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> <!-- __TRACKING__ --> </body> </html>