Node.js: createServer

var http = require('http');

http.createServer(function (req, res) {

      res.writeHead(200, {'Content-Type': 'text/plain'});

      res.end('Hola Mundo\n');

}).listen(3000, "127.0.0.1");

console.log('Server running at http://127.0.0.1:3000/');

Fuente:
https://www.youtube.com/user/0utKast