Add Bluebird Support to Mongoose

app.js

var bluebird = require('bluebird')

/* 

Other Codes

*/

var mongoose = require('mongoose')
mongoose.Promise = bluebird
mongoose.connect('mongodb://127.0.0.1:27017/todoapp', { useMongoClient: true})
.then(()=> { console.log(`Succesfully Connected to the
Mongodb Database  at URL : mongodb://127.0.0.1:27017/todoapp`)})
.catch(()=> { console.log(`Error Connecting to the Mongodb 
Database at URL : mongodb://127.0.0.1:27017/todoapp`)})