Part 3.1 of the node tutorial

app.js

/**
 * Module dependencies.
 */
var   express = require('express')
	, mongoStore = require('session-mongoose');
	
var app = module.exports = express.createServer();

// Configuration
app.configure(function(){
	app.set('views', __dirname + '/views');
	app.set('view engine', 'jade');
	app.use(express.bodyParser());
	app.use(express.methodOverride());
	app.use(express.cookieParser());
	
	var mongooseSessionStore = new mongoStore({
	    url: "mongodb://localhost/mv",
	    interval: 120000 
	});
	
	app.use(express.session( {cookie: {maxAge: 120000}, store: mongooseSessionStore, secret: "mv secret" }));
	app.use(app.router);
	app.use(express.static(__dirname + '/htdocs'));
});

// ...