Conclusion

This guide provided an overview of using CodeIgniter4 to build a simple RESTful API for managing books and authors. You learned how to set up a CodeIgniter project, configure a database, create models, and implement API endpoints using controllers and auto-routing, along with the ResponseTrait for consistent API responses.

From here, you can expand your API by adding more resources, implementing authentication and authorization using CodeIgniter Shield, and exploring advanced features like Throttler, Controller Attributes, and Web Page Caching. CodeIgniter’s flexibility and powerful features make it an excellent choice for building robust APIs.