zod
https://github.com/colinhacks/zod
TypeScript
TypeScript-first schema validation with static type inference
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- Issues
- Circular imports between `schemas` and `iso`
- “Proposal: Typed schema helper (makeSchema) for safe shape → type mapping”
- invalid type of `z.input` for conditional shapes
- Zod 4 regression: parsing with schema of indexed access type
- z.toJSONSchema: support markdownDescription
- Error when evaluating SSR module ./server.mjs: Cannot split a chunk that has already been edited
- Feature request : infer error message as a union of all possible string literals
- zod/mini is still not tree-shaken correctly inside NextJS
- Branding gets dropped in zod v4 from transforms and pipes
- How to make `optional` error message take precedence over other fields's errors?
- Docs
- TypeScript not yet supported