The idea behind ember-data [2] is that the models and their relationships are defined on the frontend side, which implies that the models are the single source of truth for both the frontend and the backend, including the APIs themselves. Ember adheres to json api specification, but there is lots of adapters for other database query languageds and/or storage types [1]

As I said in my previous post, it's a framework based on conventions, so it'd a batteries-included approach to both frontend and backend.

[1] https://emberobserver.com/categories/ember-data-adapters

[2] https://guides.emberjs.com/release/models/