server.js

var express = require('express');
var app = express();
var bodyParser    = require('body-parser');
var passport      = require('passport');
var cookieParser  = require('cookie-parser');
var session       = require('express-session');
var mongoose      = require('mongoose');

var connectionString = 'mongodb://127.0.0.1:27017/NearBy';

if(process.env.MLAB_USERNAME) {
    connectionString = process.env.MONGODB_URI;
}

var db = mongoose.connect(connectionString);

app.use(bodyParser.json());// for parsing application/json
app.use(bodyParser.urlencoded({ extended: true }));// for parsing application/x-www-form-urlencoded
app.use(session({
    secret: process.env.PASSPORT_SECRET, // some secret
    resave: true,
    saveUninitialized: true
}));
app.use(cookieParser());
app.use(passport.initialize());
app.use(passport.session());
app.use(express.static(__dirname + '/public'));

var port = process.env.PORT || 3000;

require("./server/app.js")(app);

app.listen(port);