// dotenv package that loads enviorment variables from .env files to process.env object which is available globally in nodeJS enviorment 1. dotenv = npm install dotenv 2. express = npm install express 3. mongoose = npm install mongoose 4. nodemon = npm install nodemon --------------------------------------------------------- // User Auth packages // bcrypt is a hashing function which can hash your passwords in a secure way 1. bcrypt = npm install bcrypt 2. validator = npm install validator 3. JWT = npm install jsonwebtoken