Java API Development: From Basics to Production

The book "Java API Development" is a practical guide for developers who want to master creating modern, scalable, and secure APIs in Java. The author, Alexey Smirnov, a Senior Java Developer with 10 years of experience, shares proven approaches, design patterns, and best practices that will help you move from writing simple endpoints to building industrial-grade services.

What is this book about?

The book covers the full API development cycle — from architecture design to deployment and monitoring. You will learn:

• How to design RESTful APIs with HATEOAS, versioning, and pagination.
• Working with GraphQL: schemas, resolvers, query optimization.
• Deep dive into Spring Boot: setup, configuration, profiles.
• Security: JWT, OAuth2, Spring Security, protection against CSRF and XSS.
• Testing: unit, integration, contract (Pact), and load testing (JMeter).
• Documentation with OpenAPI (Swagger) and AsyncAPI for event-driven systems.
• Microservice architecture: API Gateway, Service Discovery, Circuit Breaker.
• Working with databases: JPA, Hibernate, transactions, Flyway migrations.

Who is this book for?

• Junior Java developers — to systematize knowledge and learn to create quality APIs.
• Middle developers — to delve deeper into advanced topics and architectural solutions.
• Team Leads — provides tools for building standards and code reviews.
• Students and interns — an excellent supplement to university courses.

What will you learn after reading?

• You will be able to independently design and implement a RESTful API from scratch.
• You will learn to integrate GraphQL into an existing project.
• You will master writing secure endpoints with authentication and authorization.
• You will understand how to write tests that truly protect against regressions.
• You will learn how to document APIs so that frontend developers and DevOps can understand them.
• You will acquire skills for debugging and profiling APIs in production.

The book contains over 50 practical, ready-to-run examples and two full-fledged projects: an online store using RESTful and a chat service using GraphQL. All examples are available in a GitHub repository.

"Java API Development" is not just a book to read, but a desktop reference you will return to again and again. Start building APIs that millions of users trust!