yupvszod
Zod is TypeScript-first with full type inference — write a schema once, get a TS type for free. Yup has been around longer with broader integrations. Pick Zod for new TS projects.
yup
github.com/jquense/yupSchema validation predating Zod. Still works fine but Zod has better TypeScript inference. New projects should pick Zod.
Full review →zod
github.com/colinhacks/zodTypeScript-first schema validation. ~35k stars. The de facto choice for input validation in TS apps. Works with every form library, every API framework, every ORM. If you are not using it yet, you should be.
Full review →Which should you pick?
Pick yup if…
You are in a Yup codebase and migration cost is real.
Skip yup if…
You are starting fresh — use Zod.
Pick zod if…
You are writing TypeScript and validating any input — forms, API requests, env vars, anything.
Skip zod if…
You are not on TypeScript or you are deep in a Yup codebase that works fine.
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