jquense/yup

Health v2 · maintenance only

Adoption not part of the score

23671 stars · 945 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-29, confidence not recorded

Yup is a TypeScript schema builder for runtime value parsing and validation, letting you define object schemas that coerce, transform, and assert the shape of data. It supports async validation, static type inference, and rich error details.

Use cases

• validate form input on the client and server
• parse and coerce untrusted JSON into typed objects
• infer TypeScript types from a schema
• validate API request bodies
• share validation logic between frontend and backend
• assert the shape of fetched data at runtime

When to choose

• you need expressive, interdependent object validations with coercion
• you want schema-driven TypeScript type inference
• you need async validation for server-side checks
• you're using form libraries like Formik that integrate with yup

When to avoid

• you need maximum runtime performance for hot paths
• you prefer a lightweight minimal validator like zod for simple cases
• you need schema validation for non-JavaScript languages

Facets

library · maturity stable

form-handling serialization type-system web-development frontend developer-tools browser cross-platform schema-validation runtime-validation data-validation typescript-inference form-validation nodejs typescript

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