Building Scalable REST APIs with Go and Clean Architecture

Introduction

Clean architecture in Go helps you build maintainable, testable, and scalable applications. In this post, we will explore how to structure a REST API using clean architecture principles.

The Layers

Domain Layer

The domain layer contains your business entities and repository interfaces. It has no external dependencies.

GOCopy
type User struct {
    ID    int
    Email string
    Name  string
}

type UserRepository interface {
    FindByID(ctx context.Context, id int) (*User, error)
}

Use Case Layer

The use case layer orchestrates business logic by using domain entities and repository interfaces.

Handler Layer

HTTP handlers translate HTTP requests to use case calls and format responses.

Conclusion

Clean architecture makes your Go code testable and maintainable as the project grows.