Modified Node.js example from the front page : http://nodejs.org/

server-listening.js

var http = require('http');
http.createServer(function (req, res) {
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.end('Hello World\n');
}).listen(1337, '127.0.0.1', function() {
    console.log('listening');
});
console.log('Server running at http://127.0.0.1:1337/');