server.js

// Dependencies
var express = require('express');
var mongoose = require('mongoose');
var bodyParser = require('body-parser');

// MongoDB

const dbUrl = 'mongodb://testuser:trial@freecluster-shard-00-00-k5dgb.mongodb.net:27017,freecluster-shard-00-01-k5dgb.mongodb.net:27017,freecluster-shard-00-02-k5dgb.mongodb.net:27017/assignment1?ssl=true&replicaSet=FreeCluster-shard-0&authSource=admin&retryWrites=true&w=majority'
mongoose.connect(dbUrl)
mongoose.connection.on('connected', () => {
  console.log('Mongoose is connected!!!');
});

// Express
var app = express();

app.use(express.static(__dirname + '/public'));

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));

// Routes
app.use('/api', require('./routes/api'));

// Start server
var port = process.env.OPENSHIFT_NODEJS_PORT || 8080
, ip = process.env.OPENSHIFT_NODEJS_IP || "127.0.0.1";
app.listen(port, ip, function() {
  console.log('Express server listening on %d', port);
});