Building Type-Safe APIs with TypeScript

Why Type Safety Matters

Type safety in APIs prevents runtime errors and provides better developer experience through autocomplete and inline documentation.

Setting Up

First, define your types:

interface User {
  id: string
  name: string
  email: string
}

interface ApiResponse<T> {
  data: T
  error?: string
}

Best Practices

1. Use strict TypeScript configuration
2. Validate request bodies
3. Type your error responses
4. Document with TSDoc comments

This approach leads to more maintainable codebases and fewer bugs in production.