CodeIgniter 4 comes loaded with powerful built-in libraries to handle essential tasks like email sending, session management, form validation, database interaction, file uploads, and HTTP requests. This detailed guide introduces each library, how to load them, and demonstrates practical examples you can integrate into your projects right away.

Uploading multiple files at once is a must for modern applications. This tutorial teaches you how to implement a multi-file upload feature in CodeIgniter 4 with secure validation for file size, type, and errors. It includes route definitions, Spark CLI controller generation, clean file handling logic, and a working upload form view example.

Learn how to design decoupled, scalable applications in CodeIgniter 4 using its powerful Events system. This guide explains how to trigger events, create custom listeners, and handle application processes cleanly without cluttering controllers. Practical, real-world examples included to help you organize your application’s flow more effectively.

Secure your applications with ease using CodeIgniter 4’s official Shield Authentication system. This detailed guide covers everything — from installation and configuration to building registration, login, logout, and protected dashboard modules. Perfect for developers seeking a modern, fully-featured authentication solution without external packages.

In this comprehensive tutorial, discover how to create custom helpers in CodeIgniter 4 to simplify repetitive functions and maintain cleaner, modular application code. Learn where to place your helper files, how to structure functions, and the best ways to load them dynamically across your project. Ideal for improving development speed and consistency.

Unlock the power of CodeIgniter 4 Caching with this in-depth tutorial. Discover how to implement File, Redis, and Database cache techniques to supercharge your app’s speed, reduce server load, and deliver faster user experiences.

Learn how to manage database schema changes efficiently in CodeIgniter 4 with this complete Migrations tutorial. Discover how to create, run, rollback, and refresh migrations using Spark CLI commands to keep your database structure organized and version-controlled.

Build secure and efficient REST APIs in CodeIgniter 4 using JWT Authentication. This complete guide covers user registration, login, token generation, and protecting routes without relying on third-party packages.

Learn how to build a complete user authentication system in CodeIgniter 4 without third-party packages. This tutorial covers registration, login, logout, session management, route protection, and secure password handling using built-in features.

Master database seeding in CodeIgniter 4 with this complete tutorial. Learn how to create, run, and manage seeders to populate your database with test and sample data using Spark CLI commands.