server.js

var express = require('express');
var morgan = require('morgan');
var mongoose = require('mongoose');
var bodyParser = require('body-parser');
var ejs = require('ejs');
var engine = require('ejs-mate');
var session = require('express-session');
var cookieParser = require('cookie-parser');
var flash = require('express-flash');
var MongoStore = require('connect-mongo/es5')(session);  //to store session on server side
var passport  = require('passport');      //authentication and login like OAuth

var secret = require('./config/secret');
var User = require('./models/user');

var app = express();

//Connect to mongoDB
mongoose.connect(secret.database, function(err) {
  if (err) {
    console.log(err);
  }
  else {
    console.log("Connected to the database");
  }
});

//Middleware
app.use(express.static(__dirname + '/public'));
app.use(morgan('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
app.use(cookieParser());
app.use(session({
  resave : true,
  saveUninitialized: true,
  secret: secret.secretKey,
  store: new MongoStore({url: secret.database, autoReconnect: true})
}));
app.use(flash());

app.engine('ejs', engine);
app.set('view engine', 'ejs');

var mainRoutes = require('./routes/main');
var userRoutes = require('./routes/user');

app.use(mainRoutes);
app.use(userRoutes);

app.listen(secret.port, function(err) {
  if(err) throw err;
  console.log("Server is running on port "+ secret.port);
});