API Development in Go (Golang): From Idea to Production

This book is a comprehensive practical guide to building modern APIs in Go (Golang). You will go from designing the architecture to deploying a finished product to production. Each chapter contains working code examples that can be immediately adapted to your own tasks.

What the book covers:

• Designing RESTful APIs and gRPC services following best practices
• Working with popular frameworks: Gin, Echo, Fiber, chi
• Interacting with databases (PostgreSQL, MongoDB, Redis) using GORM and sqlx
• Authentication and authorization: JWT, OAuth 2.0, API keys
• Error handling, logging, and monitoring (Prometheus, Grafana)
• Testing: unit tests, integration tests, mock objects
• Containerization with Docker and orchestration with Kubernetes
• CI/CD pipelines and deployment automation
• Performance optimization and working with concurrency
• API documentation (Swagger/OpenAPI) and client generation

Who this book is for:

• Beginner Go developers who want to learn how to build APIs
• Backend developers transitioning from other languages to Go
• Experienced Go programmers looking to systematize their knowledge
• Team Leads and architects choosing Go for microservice architecture

What you will learn from the book:

• How to properly structure a project and organize code
• How to choose between REST and gRPC depending on the task
• How to design scalable and fault-tolerant APIs
• How to integrate external services and handle errors
• How to write tests that actually catch bugs
• How to set up monitoring and alerting for APIs
• How to speed up development using code generation

The book contains over 200 pages of practical material, 50+ ready-made code examples, and 10 exercises for independent work. All examples are available in a GitHub repository. You will get not just theory, but ready-made templates and architectural solutions that can be immediately applied in commercial development.

Go is the ideal language for building high-load APIs. Its performance, simplicity, and built-in concurrency support make it the number one choice for modern microservice architectures. This book will help you master all aspects of API development in Go and become a sought-after specialist.