Building a WordPress API plugin means exposing custom endpoints and handling requests securely. Below is a concise, practical workflow you can follow to create a maintainable REST API plugin that integrates with WordPress standards.
Step-by-step approach
- Set up the plugin — Create a plugin folder and main PHP file with the plugin header, then hook into plugins_loaded or an init action.
- Register routes — Use register_rest_route inside rest_api_init to define endpoints, methods, and schema.
- Define callbacks — Write clear callback functions that sanitize inputs, validate parameters, and return a WP_REST_Response or WP_Error on failure.
- Handle permissions — Implement a robust permission_callback checking capabilities, nonces, or OAuth depending on public/private needs.
- Structure code — Organize controllers, validation, and database access in separate classes or files for testability and future maintenance.
Best practices: cache responses when appropriate, version your API routes, document endpoints and request/response shapes, and write unit and integration tests. Always escape and sanitize output, and never trust incoming data.
If you prefer hands-on help or a review of your implementation, Thinkit Media can assist with design, security hardening, and production deployment guidance to ensure your API plugin is reliable and scalable.
