mongoose in server.js

const express = require('express');
const mongoose = require('mongoose');
const bodyParser = require('body-parser');
const app = express();

//connect to mongoose
mongoose.Promise = global.Promise;

mongoose
  .connect(
    'mongodb://DB-username:Db-password@ds133353.mlab.com:33353/DB-name',
    { useNewUrlParser: true }
  )
  .then(() => {
    console.log('mongoDB connected');
  })
  .catch(err => {
    console.log('trouble connecting mongoDB');
  });

//Home page
app.get('/', (req, res) => {
  res.send('about');
});

const PORT = process.env.PORT || 5000;
app.listen(PORT, () => {
  console.log(`Server started on port ${PORT}`);
});