How do I implement this with a frontend app

[AnasGamal]

When implementing this with a frontend, I am assuming that for example if I want to do something with the users data, I would call the get users endpoint. That would be only accessible by an admin role. If I login with an admin role and use the token that I got, how do I make sure that the app stay running? since I think I would need to renew the token every once in a while.

If I am thinking about this in the wrong direction please correct me.