How to make a login system in Javascript?

Question

I am trying to make a simple login system in javascript. The code should be for multiple users

e.g: user: love pass: cat, user2: mom pass2: love etc.

I need the

Answer 1

You should NEVER, EVER do the username/password check in the client side, since anyone could just view the source of your javascript file and find the password pattern or even just bypass it easily. you will ALWAYS want to send the username/password to the server and have the server redirect it for you