# Zod

> MIT TypeScript-first schema validation with static type inference

**Category:** Libraries  
**Pricing:** open-source  
**URL:** https://zod.dev  
**GitHub:** https://github.com/colinhacks/zod  
**Added:** 2026-09-05

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## The Hook

Zod is the schema you write once that becomes both runtime checks and TypeScript types.

## What's Good

MIT library. Parse unknown input to typed values. Composable objects, unions, transforms. De-facto standard across tRPC, forms, and API boundaries. Zero SaaS.

## The Catch

TS schema plus static inference; library not SaaS. Bundle size matters at the edge. Not a form UI or API gateway.

## Verdict

MIT TS schemas. Free library; you own the call sites.