register/login api

Is there support out of the box for this in WordPress or do you need to create a custom route etc?

No, there is no endpoint for user login and registration. You would need to install an authentication plugin designed for remote auth such as the OAuth2 plugin, or wait until 5.6 adds application passwords. No endpoint exists for user registration.

and I tried to use postman to post username, email and password to this endpoint

That endpoint can be used to create new users but only if made as an authenticated request from a user that can do that, aka the add new user button in the backend. It can’t be used for registration.

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