Setting up MongoDB on Express for Node.js

//1. Install mongodb package for Express

$ sudo npm install —-save mongodb

//--save will add mongodb to the Express dependencies in package.json

//2. Now to set up MongoDB usage in your router (ex: routes/index.js):

var express = require('express');
var router = express.Router();
var mongo = require('mongodb').MongoClient;
var objectId = require('mongodb').ObjectID;
//mongodb is strongly typed and uses ObjectIDs as IDs. IDs as strings wont work for DB update or delete. We need to use ObjectID.
var assert = require('assert'); 
//assert is built into node.js for testing and comparing values. It's useful to check if db transactions succeeded or not

var url = 'mongodb://localhost:27017/test'; //test is the name of the MongoDB database and 27017 is the default MongoDB port