Instead of dealing with a mix of before_filters, Rack-middlewares, controller code and callbacks, an endpoint is just another activity and allows to be customized with the well-established Trailblazer mechanics.

Endpoint is the missing link between your routing (Rails, Hanami, …) and the “operation” to be called. It provides standard behavior for all cases 404, 401, 403, etc and lets you hook in your own logic like Devise or Tyrant authentication, again, using TRB activity mechanics.

The endpoint gem is the missing link between your routing framework and your business code. It acts like a mix of before_filters and “responder” that handles authentication and authorization, invoking your actual logic, and rendering a response.