Kotlin API Development: From Basics to Production

This book is a comprehensive guide to building modern APIs in Kotlin. You will progress from your first lines of code to deploying a production-ready service. The material is built on practical examples that can be immediately applied to real projects.

Who this book is for:

• Java/Kotlin developers looking to master API creation
• Backend developers transitioning to Kotlin
• Students and beginner programmers with basic knowledge of the JVM ecosystem
• Team Leads and architects choosing a stack for microservices

What you will learn:

• Kotlin fundamentals for backend development: coroutines, Flow, serialization
• Designing RESTful APIs using Ktor and Spring Boot
• Working with databases: Exposed, Hibernate, Flyway
• Authentication and authorization: JWT, OAuth2, Keycloak
• Creating GraphQL APIs with the graphql-kotlin library
• Documenting APIs with OpenAPI/Swagger
• Testing: unit, integration, and load tests
• Containerization with Docker and deployment to Kubernetes
• Monitoring and logging in a production environment

Book features:

• Step-by-step instructions with full example code
• Real-world cases from commercial development
• Comparison of Ktor and Spring Boot for different scenarios
• A complete online store project with a full API
• Practical exercises to reinforce the material

The book is suitable both for self-study and for use as a reference. You will gain not only theoretical knowledge but also the practical skills needed to work on real projects. All examples have been tested on the latest versions of Kotlin 2.0 and are compatible with modern frameworks.

After reading, you will be able to confidently design, develop, and maintain APIs of any complexity in Kotlin, understanding industry best practices and architectural patterns.