GraphQL on Rust: Building Modern APIs with async-graphql and Juniper

The book "GraphQL on Rust" is a comprehensive guide to developing modern, high-performance APIs using the Rust language and its powerful type system. Unlike traditional REST approaches, GraphQL provides clients with the flexibility to request only the necessary data, while Rust guarantees memory safety and incredible execution speed. This book combines the strengths of both technologies, offering a practical path from the basics to creating production-ready servers.

Who is this book for?

This book is intended for developers who are already familiar with the basics of Rust (ownership, borrowing, lifetimes, traits) and want to learn how to create web services. You will learn how to apply the Rust ecosystem to build complex yet elegant APIs. Experience with other programming languages (Python, JavaScript, Go) will be a plus, as you will be able to compare approaches and appreciate the advantages of Rust.

What you will learn

• GraphQL Basics: type system, schemas, queries, mutations, and subscriptions. How to design flexible and efficient data schemas.
• Two Main Frameworks: detailed study of async-graphql (the most popular, asynchronous, with support for subscriptions via WebSockets) and Juniper (mature, synchronous, with a focus on simplicity). You will learn to choose the right tool for the task.
• Asynchrony and Performance: using tokio or async-std to handle thousands of requests per second. Optimizing resolvers, pagination, batch data loading (DataLoader) to prevent the N+1 problem.
• Security and Authorization: integrating authentication (JWT, sessions), role-based access control at the field and type level. Protection against injections and depth-limit attacks.
• Database Integration: working with SQL (via sqlx or diesel) and NoSQL (MongoDB, Redis). Implementing complex queries and transactions in the context of GraphQL.
• Testing and Debugging: writing unit tests for resolvers, integration testing of GraphQL queries, profiling tools.
• Deploy and Monitoring: building a binary file, containerization (Docker), setting up metrics (Prometheus) and logging (tracing).

Book Structure

The first part introduces GraphQL concepts and environment setup. The second part dives into async-graphql using a blog creation example. The third part is dedicated to Juniper and alternative approaches. The fourth part covers advanced topics: federation (Apollo Federation), real-time subscriptions, migrating from REST to GraphQL. Each chapter contains practical tasks and ready-made code examples available in the repository.

By the end of the book, you will be able to confidently create reliable, fast, and scalable GraphQL services in Rust that can be used both in a microservice architecture and in monolithic applications. This is not just a reference guide — it is a practical tool for advancing your skills as a backend developer.