Node.js Web Development - Fourth Edition

Launching a server with Node.js

Many scripts that you'll run are server processes. We'll be running lots of these scripts later on. Since we're still in the dual mode of verifying the installation and familiarizing you with using Node.js, we want to run a simple HTTP server. Let's borrow the simple server script on the Node.js home page (http://nodejs.org).

Create a file named app.js containing the following:

const http = require('http'); 
http.createServer(function (req, res) { 
  res.writeHead(200, {'Content-Type': 'text/plain'}); 
  res.end('Hello, World!\n'); 
}).listen(8124, '127.0.0.1'); 
console.log('Server running at http://127.0.0.1:8124'); 

Run it as follows:

$ node app.js
Server running at http://127.0.0.1:8124  

This is the simplest of ...