API Development in Go (Golang): From Design to Deployment

The book "API Development in Go (Golang)" is a comprehensive practical guide for those who want to master creating modern, scalable, and high-performance API services in Go. The author, with many years of experience in developing high-load systems, takes the reader from architecture design to deploying a finished product to production.

What is this book about?

The book sequentially covers all stages of creating an API in Go:

• Go Basics for APIs — project structure, working with HTTP, error handling, contexts, and goroutines.
• API Design — REST principles, versioning, documentation (OpenAPI/Swagger).
• Working with Databases — PostgreSQL, MongoDB, using ORM (GORM) and pure SQL.
• Authentication and Authorization — JWT, OAuth2, RBAC, middleware.
• gRPC and Protocol Buffers — creating high-performance microservices.
• Testing — unit tests, integration tests, mocks, and test containers.
• Deployment and Monitoring — Docker, Kubernetes, CI/CD, logging, and metrics (Prometheus).

Who is this book for?

The book will be useful for:

• Junior developers who already know the basics of Go and want to learn how to create full-fledged APIs.
• Middle developers looking to deepen their knowledge in architecture and optimization.
• Backend engineers transitioning from other languages (Python, Java, PHP) to Go.
• Team leads and architects who need best practices and design patterns.

What will the reader learn?

• How to properly structure a Go project for an API.
• How to work with routers (chi, gin, echo) and middleware.
• How to integrate databases and caching (Redis).
• How to implement reliable authentication and protection against attacks.
• How to write tests that actually verify business logic.
• How to package an application in Docker and deploy it in Kubernetes.
• How to monitor performance and debug issues in production.

The book contains many real code examples, practical tasks, and ready-made templates that can be immediately used in your projects. All examples are available in a GitHub repository.

After reading, you will be able to independently develop APIs of any complexity level — from a simple REST service to a distributed microservices system in Go.