I'll assume it's the latter. Mocks are quick apis you can set up (mockable.io is a popular one) in a couple minutes that can be configured to provide an endpoint and a static response that you tell it to. Using that, you can hit the mock endpoint with your front end code. If you do it right and make a constant, and collaborate on the endpoint and object with the BE dev, the only thing you'll have to change when... Source: almost 3 years ago

When you are writing code for a project, at some point you're gonna have to come across user logins. To perform user specific tasks, to save user data and to do various kinds of stuff, user accounts is a mandatory feature in any system. But building a fully fledged login system is not so easy: especially having the flexibility to incorporate many kinds of login options (Email and password, Social Logins, Magic... - Source: dev.to / over 2 years ago