wp-rest-api

Register custom WordPress REST API routes using register_rest_route or by extending WP_REST_Controller. This allows you to define custom endpoints, validate arguments, and shape responses for your specific application data.

Expose custom post types and taxonomies in the WordPress REST API by setting show_in_rest to true when registering them. This automatically generates the necessary REST endpoints for your content.

Add custom fields to WordPress REST API responses using register_rest_field and register_meta. These functions allow you to append custom meta data to your existing REST API endpoint outputs.

WordPress REST API permission callbacks return 401 Unauthorized when authentication fails or current_user_can checks return false. Debug your permission callbacks to ensure proper user capabilities are verified before granting endpoint access.

The best way to debug WordPress REST API endpoints is to inspect permission callbacks, validate arguments, and review response shaping logic. Ensure robust error handling is implemented within your custom routes to identify issues.

You do not strictly need WP_REST_Controller to build a WordPress REST API endpoint, as register_rest_route works independently. However, extending the controller provides a standardized structure for argument validation and response shaping.