Basic requirements to create and run a Node JS app

To create a Node.js app that acts as a back end for an Angular JS app, these are the minimum required modules.

1. EXPRESS
   Express.js is basically helps you manage everything,from routes, to handling requests and views.
   Installation
   npm install express
   Usage
   var express=require(‘express’);
   var app=express();
   Reference link : https://www.npmjs.com/package/express
2. BODY PARSER
   Body parser parse the incoming request bodies and it is available under the req.body property
   Installation
   npm install body-parser
   Usage
   var bodyParser = require(‘body-parser’)
   app.use(bodyParser.urlencoded({
   extended: true
   }));
   Reference link : https://www.npmjs.com/package/body-parser
3. CORS
   cors exists for security reasons and to limit which resources a browser can gain access to, from another website.
   Installation
   npm install cors
   Usage
   var cors = require(‘cors’)
   app.use(cors());
   Reference link : https://www.npmjs.com/package/cors
4. CRYPTO-JS
   Nodejs support for cryptography (eg:AES,CTR..)
   Installation
   npm install crypto-js
   Usage
   var crypto = require(‘crypto’);
   Reference link : https://www.npmjs.com/package/crypto-js