npm i express mongoose nodemon bcrypt jsonwebtoken
- bcrypt :
- it is used for encrypt the password to store into database.
- jsonwebtoken:
- it is used for creating the token value which is helps for login/signup etc..
- sing for response a token when you have to login
- verify again and agian whenever you want to access the others data. Example: -- you logged In get a token whenever you visit another page you got the error if did not pass correct authorization in header.
- To encypt the password as singup and decrpt as in login