En enkel webbserver.

server.js

var express = require("express");
var app = express();

/* serves main page */
app.get("/", function(req, res) {
   //res.sendfile('index_es5.html')
   res.sendfile('index.html')
});

 app.post("/user/add", function(req, res) { 
   /* some server side logic */
   res.send("OK");
 });

/* serves all the static files */
app.get(/^(.+)$/, function(req, res){ 
    console.log('static file request : ' + req.params);
    res.sendfile( __dirname + req.params[0]); 
});

var port = process.env.PORT || 3000;
app.listen(port, function() {
  console.log("Listening on " + port);
});