server.js

var express = require('express');
var app = express();
var path = require('path');
var bodyParser = require('body-parser');
var router = express.Router();


app.use(function(req, res, next) {
  res.header('Access-Control-Allow-Origin', '*');
  res.header('Access-Control-Allow-Credentials', true);
  res.header('Access-Control-Allow-Methods', 'GET, OPTIONS');
  res.header('Access-Control-Allow-Headers', 'Content-Type');
  next();
});

app.options("*", function(req, res) {
  res.header('Access-Control-Allow-Origin', '*');
  res.header('Access-Control-Allow-Credentials', true);
  res.header('Access-Control-Allow-Methods', 'GET, OPTIONS');
  res.header('Access-Control-Allow-Headers', 'Content-Type');
});



app.use('/', express.static(path.join(__dirname, 'public')));


app.get('/', function(req, res){
	res.sendFile('index.html');
})

app.use(bodyParser.json());
app.use(bodyParser.urlencoded());
app.use(express.static(path.join(__dirname, 'public')));

app.set('port', process.env.PORT || 4040);

var server = app.listen(app.get('port'), function(){ 
	console.log('Express server listening on port ' + server.address().port)
});