API Development in TypeScript: From Idea to Production

This book is a comprehensive guide to building modern, reliable, and scalable APIs in TypeScript. Whether you are just starting your journey in backend development or already have experience with JavaScript, you will find practical knowledge here that can be immediately applied to real-world projects.

What is this book about?

The book covers the full API development cycle: from architecture design and environment setup to testing, documentation, and deployment. You will learn how to leverage TypeScript's strict typing to create self-documenting, easily maintainable code that minimizes errors at compile time.

Key topics:

• TypeScript basics for backend: types, interfaces, generics, decorators, and their application in APIs
• RESTful API design: REST principles, versioning, HATEOAS, pagination, filtering
• Express.js and Nest.js: building servers, middleware, routing, error handling
• Working with databases: TypeORM, Prisma, migrations, query optimization
• Authentication and authorization: JWT, OAuth 2.0, role-based access control
• Data validation: Zod, Joi, class-validator
• Testing: unit tests (Jest), integration tests, e2e tests
• Documentation: Swagger/OpenAPI, automatic documentation generation
• Deployment and CI/CD: Docker, Kubernetes, GitHub Actions
• Advanced patterns: CQRS, Event Sourcing, Repository Pattern, Dependency Injection

Who is this book for?

• Beginner developers familiar with JavaScript who want to learn TypeScript and backend development
• Experienced JavaScript developers looking to transition to TypeScript and improve code quality
• Backend developers wanting to learn modern approaches to building APIs
• Fullstack developers seeking to expand their skillset

What will you learn?

• How to set up a TypeScript project from scratch and choose the right tools
• How to design APIs that are easy to maintain and extend
• How to use advanced TypeScript features to create type-safe code
• How to integrate with databases and external services
• How to write tests that truly protect against bugs
• How to automate build, testing, and deployment processes
• How to document APIs so they are easy to use

Each chapter contains practical examples, ready-to-use code snippets, and exercises for independent work. You won't just read theory—you will build a full-fledged API service ready for production deployment.

The book is written in a lively, accessible style and focuses on practical application. All code examples are available in a GitHub repository, so you can start experimenting right away.

Master TypeScript and build APIs that people trust!