hey-api

Why we included this project

Teams that ship against OpenAPI-defined backends will find a lot to like here. hey-api reads your API specification and generates typed client code, including SDKs, request validators, mock servers, and query hooks, across TypeScript and Python, so you don't hand-write or maintain boilerplate that drifts from the contract. The plugin architecture (20+ plugins) lets you pull in just the pieces you need, from Zod and Valibot schemas to TanStack Query integration, and regenerate deterministically whenever the spec changes. It's a practical fit for frontend and full-stack developers who want type safety and consistency across many endpoints, and for teams standardizing how they consume internal or third-party APIs. Since the output is deterministic, you can also run it as a codegen step in CI rather than a runtime dependency.