You can write validation schemas using zod library [1]. They end up looking pretty similar to typescript definitions (same vocabulary, same methods for combinin

You can write validation schemas using zod library [1]. They end up looking pretty similar to typescript definitions (same vocabulary, same methods for combining/intersecting/filtering). And if you migrate to typescript you'll get type definitions for free out of those schemas. [1] https://github.com/colinhacks/zod https://github.com/colinhacks/zod