Zod
MIT TypeScript-first schema validation with static type inference
Libraries / Validation · OSS/MIT
What's Good
MIT library. Parse unknown input to typed values. Composable objects, unions, transforms. De-facto standard across tRPC, forms, and API boundaries. Zero SaaS.
The Catch
TS schema plus static inference; library not SaaS. Bundle size matters at the edge. Not a form UI or API gateway.
Verdict
MIT TS schemas. Free library; you own the call sites.
Embed
[](https://stackgems.com/gems/zod)