Designing APIs with TypeScript

APIs are the backbone of modern software - but too many teams still build them on fragile assumptions, handwritten docs, and broken client integrations.

Designing APIs with TypeScript shows you how to build APIs that are correct by design.

This practical, modern guide introduces a contract-first approach powered by TypeScript, where your API specification becomes the single source of truth. No more drift between backend and frontend. No more guessing request shapes. No more runtime surprises.

You'll learn how to design expressive, versionable API contracts, generate fully type-safe clients automatically, and enable frontend and backend teams to move independently - without breaking each other.

Whether you're building REST, HTTP services, or internal platform APIs, this book gives you the tools and patterns used by high-performing teams to ship faster with confidence.

Inside you'll discover how to:

• Design APIs starting from clear, reusable contracts

• Use TypeScript to enforce correctness across services

• Generate safe, fully typed clients with zero duplication

• Prevent breaking changes before they reach production

• Improve collaboration between frontend, backend, and platform teams

• Scale API development across multiple teams and repositories

• Refactor fearlessly with compile-time guarantees.