drupal-routing-controllers

To define Drupal routes and controllers, you create a `.routing.yml` file to map URLs to specific controller methods, then write PHP classes adhering to PSR-4 standards to handle requests and return render arrays or JSON responses.

Dependency injection in Drupal controllers involves properly passing required services into the controller class, which ensures cleaner, more maintainable code by decoupling the request handling logic from service implementation.

Yes, you can create API endpoints returning JSON using Drupal routing by defining the URL path in your `.routing.yml` file and implementing the controller class to return JSON responses instead of render arrays.

The best way to add a custom page route with permissions is to define the URL path and access requirements in a `.routing.yml` file, then implement the corresponding PHP controller method to generate the page content.

Yes, you need YAML to set up URL paths for custom Drupal modules because the Drupal routing system requires a `.routing.yml` file to map URLs to executable PHP code within your module.

You should use render arrays instead of direct HTML in Drupal controllers when generating page content, as this adheres to Drupal's routing system standards and allows proper dependency injection and theme layer processing.