app.js

var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var exphbs = require('express-handlebars');
var expressValidator = require('express-validator');
var flash = require('connect-flash');
var session = require('express-session');
var passport = require('passport');
var LocalStrategy = require('passport-local').Strategy;
var mongo = require('mongodb');
var mongoose = require('mongoose');
mongoose.connect('mongodb://localhost/fintech', { useNewUrlParser: true }, (err) => {
    if (!err) { console.log('MongoDB Connection Succeeded.') }
    else { console.log('Error in DB connection : ' + err) }
});
mongoose.set('useCreateIndex', true);
var db = mongoose.connection;

// declare route for index.js file in routes folder
var routes = require('./routes/index');
// declare routes for other js files in routes folder
var users = require('./routes/users');
var creditcards = require('./routes/creditcards');
var loans = require('./routes/loans');
var fds = require('./routes/fds');


//init app
var app = express();

//view engine
app.set('views',path.join(__dirname, 'views'));
app.engine('handlebars', exphbs({defaultLayout: 'layout'}));
app.set('view engine', 'handlebars');

// BodyParser Middleware
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
app.use(cookieParser());

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

//express session
app.use(session({
	secret: 'secret',
	saveUninitialized: true,
	resave: true
})); 

// Passport init
app.use(passport.initialize());
app.use(passport.session());

// Express Validator
app.use(expressValidator({
  errorFormatter: function(param, msg, value) {
      var namespace = param.split('.')
      , root    = namespace.shift()
      , formParam = root;

    while(namespace.length) {
      formParam += '[' + namespace.shift() + ']';
    }
    return {
      param : formParam,
      msg   : msg,
      value : value
    };
  }
}));

// Connect Flash
app.use(flash());

// Global Vars
app.use(function (req, res, next) {
  res.locals.success_msg = req.flash('success_msg');
  res.locals.error_msg = req.flash('error_msg');
  res.locals.error = req.flash('error');
  res.locals.user = req.user || null;
  next();
});

// using above declared route variables 
app.use('/', routes); //for index.js file in routes folder
app.use('/users', users); //for users.js file
app.use('/creditcards', creditcards); //for creditCards.js file
app.use('/loans', loans); //for loans.js file
app.use('/fds', fds); //for fds.js file


// Set Port
app.set('port', (process.env.PORT || 3000));

app.listen(app.get('port'), function(){
	console.log('Server started on port '+app.get('port'));
});