Regardless of their initial size or scope, projects tend to grow in complexity over time. As new features are added and requirements evolve, the number of components and the connections between them multiply. Services, handlers, repositories, externa...

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Dependency injection (DI) in Go involves passing dependencies into components rather than creating them internally, making code more testable and maintainable. The guide covers manual DI as the idiomatic Go approach, explains when complexity grows with nested dependencies, and explores DI libraries like Google Wire (compile-time), Uber Dig (runtime), and Uber Fx (with lifecycle management). Manual DI works well for most projects, while frameworks help manage complexity in larger applications. Best practices include keeping dependencies explicit, starting simple, and using interfaces for testability.

How to Implement Dependency Injection in Go - Explained with Code Examples