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

The book "GraphQL on Go (Golang)" is a practical guide for developers who want to master a modern approach to building APIs using the Go language. Unlike REST, GraphQL provides clients with the flexibility to request only the necessary data, making it an ideal choice for complex and high-load systems.

What is this book about?

The book covers the full development cycle of a GraphQL API in Go: from basic concepts to production deployment. You will learn how to design efficient schemas, write resolvers, work with real-time subscriptions, and ensure application security. Special attention is given to integrating GraphQL with popular Go frameworks (Chi, Gin) and databases (PostgreSQL, MongoDB).

Who is this book for?

• Go developers familiar with the basics of the language who want to learn GraphQL;
• Backend engineers looking to transition from REST to a more flexible API architecture;
• Team leads and architects choosing a technology stack for new projects;
• Students and juniors seeking to acquire in-demand skills.

What will you learn?

• GraphQL fundamentals: schemas, types, queries, mutations, and subscriptions;
• Setting up a GraphQL server in Go using the gqlgen and graphql-go libraries;
• Designing complex schemas with performance and extensibility in mind;
• Query optimization: the N+1 problem, data loaders, batching;
• Authorization and authentication in GraphQL (JWT, OAuth2, role-based model);
• Working with databases: integration via GORM, sqlx, and raw SQL;
• Real-time subscriptions (WebSocket, Redis Pub/Sub);
• Testing GraphQL APIs: unit tests, integration tests, mock resolvers;
• Documenting schemas with GraphQL Playground and Voyager;
• Deployment: containerization (Docker), CI/CD, monitoring (Prometheus, Grafana);
• Migrating from REST to GraphQL: gradual adoption and hybrid solutions.

Why should you read this book?

The author shares not only theory but also real-world case studies: how to avoid common mistakes, how to scale an API to millions of requests, and how to maintain clean code. All code examples are available for download and have been tested on Go 1.21+. The book is written in simple and clear language, with a focus on practical value.

If you want to build modern, fast, and flexible APIs in Go — this book will be your reliable companion.