Important: If your application requires only a user model with email and password fields, then you can use the built-in User model for user management. Otherwise, you must create your own custom model (named something other than “User,” for example “Customer” or “Client”) that extends the built-in User model rather than use the built-in User model directly.

LoopBack 2.x allows only one model in an application that is based on the User model.