How does jwt generate a token on the server?

Question

PHP

Hello. I want to understand how jwt works. If you make authorization, without jwt. Those. when registering, we immediately generate a token and save it for the user. After authorization, if everything is OK, we give this token to the user. And save to the same localstorage. What is the difference between this method and jwt? And how you can do authorization in a mobile application is written in react native. We need to save the session in the database, let's save a token with a unique device id?

Answer 1

JWT on google.
It does not need to be stored, only validated.
This is the essence of it contains data for its own identification.