How to correctly and simply implement output in json or view in CRUD?

Question

Slim Framework

Good afternoon.
For anyone, many have come across a similar question - add AJAX processing to CRUD - that is, you need to pass, depending on the request - AJAX or not - return either a redirect, or json model data, or an error with certain statuses. Linivo to add processing to each controller - if that. Is there any option to avoid this? Middleware for example, I really can't figure out how to implement it.