GraphQL on Go (Golang): A Practical Guide to Building APIs

Modern web development requires flexible and efficient APIs. GraphQL has become the de facto standard for many projects, and Go (Golang) is the ideal language for building high-performance servers. The book "GraphQL on Go (Golang)" is a practical guide that will take you from the first steps to creating a production-ready GraphQL API in Go.

What is this book about?

The book covers the full development cycle of a GraphQL API in Go. You will start with the basics: what GraphQL is, how it differs from REST, and how to set up the environment. Then, step by step, you will master the gqlgen library — the most popular tool for generating GraphQL servers in Go. You will learn how to:

• Define GraphQL schemas and generate Go code.
• Work with queries, mutations, and real-time subscriptions.
• Connect databases (PostgreSQL, MongoDB) and implement complex relationships between entities.
• Add authentication and authorization (JWT, OAuth2).
• Optimize performance with DataLoader and batch loading.
• Test GraphQL endpoints and write unit tests.
• Migrate from REST to GraphQL without stopping the service.

Who is this book for?

The book is intended for Go developers of any level who want to master a modern approach to building APIs. If you already write in Go but are not familiar with GraphQL, you will quickly catch up. If you are an experienced developer in other languages but want to transition to Go and GraphQL, the book will help you do so painlessly. For programming beginners, the material may be challenging, but the author provides all necessary explanations and links to additional resources.

What will you learn by reading this book?

• Understand the philosophy of GraphQL and learn to design flexible schemas.
• Master gqlgen and other libraries (graphql-go, graphql-relay-go).
• Be able to create WebSocket subscriptions for real-time applications (chats, notifications).
• Learn to protect APIs from typical attacks (SQL injection, DoS via query depth).
• Gain skills in profiling and optimizing GraphQL queries.
• Learn how to integrate GraphQL with microservice architecture and Kubernetes.

The book contains many code examples, ready-made snippets, and practical exercises. All examples are available in a GitHub repository. After reading, you will be able to independently develop and maintain a GraphQL API in Go that runs stably and quickly under any load.

GraphQL on Go (Golang) is not just a translation of documentation, but a structured tutorial with real production scenarios. Start your journey to modern APIs today!