wp-rest-api

To expose custom post types via the WordPress REST API, you register custom routes using `register_rest_route` and configure `WP_REST_Controller` classes to shape the response data. This process defines endpoints for your data, sets permission callbacks, and ensures schema validation for seamless integrations.

WordPress REST API 404 or 403 errors typically occur due to missing permission callbacks or incorrect route registration. Debugging involves verifying your `register_rest_route` configuration, ensuring proper authentication workflows, and validating that your custom post types are correctly exposed to resolve permission issues.

WP-CLI is not strictly required for all WordPress REST API debugging but may be necessary for certain workflows and environment setups. The Skill supports WordPress 6.9+ and PHP 7.2.24+, utilizing WP-CLI to streamline specific endpoint troubleshooting and route validation tasks when needed.

To validate arguments and shape responses for WordPress REST endpoints, you define schemas within your `WP_REST_Controller` classes. This configuration allows you to customize response fields, validate incoming data against your schema, and manage links for your custom post types effectively.

The best way to register a route for a custom post type is to use `register_rest_route` under a specific namespace like 'my-plugin/v1'. You then implement `WP_REST_Controller` to handle schema validation, define permission callbacks, and format the custom post type data in the JSON response.