Typing Fetch Responses with Generic Wrappers
Write a typed fetch helper that returns safe types.
Welcome
Write typed fetch helper functions to safely consume HTTP APIs.
The Problem with fetch
The fetch API returns Promise and .json() returns Promise. Without types, you lose all safety.
const res = await fetch('/api/user');
const data = await res.json(); // data: any — unsafeAll lessons in this course
- Typing Fetch Responses with Generic Wrappers
- Runtime Validation with Zod
- OpenAPI Codegen: Auto-Generated Types
- Type-Safe tRPC Client Overview