app.js

var express = require('express');

var app = express();

app.get('/', function (req, res) {
	res.send('Express.js Hello world');
});

app.listen(8000);

package.json

{
	"name" : "hello-world",
	"version" : "0.0.2",
	"dependencies" : {
		"express" : "3.4.4"
	},
	"scripts": {
		"start" : "app.js"
	}
}