In previous part of the tutorial we made simple node.js API sending a hardcoded json containing a message string to the Android client. Now , we will be adding say EMPLOYEE details using one API ( addEmployee ) into the Mongodb and retrieving the list using other API ( listEmployee ). Mongodb is document-based, high-performance NoSQL database. You can define multiple databases in MongoDB where each database can have many collections (like TABLE ), and those collections are simply a set of documents that consist of data stored as a key-value pair. i) In terminal , enter npm install mongodb --save that will download mongodb module locally and creates a directory mongodb inside node_modules. Also ,enter npm install body-parser --save that will download body-parser module that allows sending parameters of post requests. We will be modifying the same main.js file created in Part I of the tutorial. Add below lines of code : var express = require('express'); // impo...