colinhacks/zod

Health v2 · maintenance only

Adoption not part of the score

43535 stars · 2147 forks observed · 2026-08-28

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

Zod is a TypeScript-first schema validation library for defining and validating data structures at runtime with static type inference. It has zero dependencies, a tiny 2kb core, works in Node.js and browsers, and includes built-in JSON Schema conversion.

Use cases

• validate untrusted API request bodies in TypeScript
• parse and type-check environment variables
• validate form input with type-safe schemas
• infer static TypeScript types from runtime schemas
• convert schemas to JSON Schema for OpenAPI docs
• validate data from external JSON sources
• build end-to-end typesafe APIs with tRPC

When to choose

• you use TypeScript and want runtime validation that stays in sync with static types
• you need a small, dependency-free validation library for Node or browsers
• you want JSON Schema generation or a rich validation ecosystem (tRPC, form libraries)

When to avoid

• your project is plain JavaScript without TypeScript and you don't need type inference
• you need extremely high-throughput validation where a compiled/AOT validator outperforms an interpreter
• you're locked to TypeScript versions older than 5.5

Facets

library · maturity stable

serialization type-system developer-tools web-development developer-tools apis browser bun cross-platform schema-validation runtime-validation static-type-inference -schema typescript-first form-validation env-validation nodejs deno typescript

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