Infrastructure

Zod

TypeScript-first schema validation. Define schemas once, get static types and runtime validation. The default validator for tRPC, Next.js server actions, and AI SDKs.

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Zod is the schema validation library that TypeScript needed. You write a schema with a chainable API and get both runtime validation and a static type out of it. It pairs naturally with form libraries (React Hook Form), API layers (tRPC, hono), and AI tool calling (Vercel AI SDK and OpenAI Agents SDK both accept Zod schemas). v4 brought tree-shakeable imports and faster parsing. If you write TypeScript on the server in 2026, you almost certainly use Zod.

validation typescript schema runtime

Zod at a glance

Last verified October 17, 2026

Pricing: Free and open source (MIT)
Install: npm install zod
Models: Not an AI tool: it is a TypeScript-first validation library with zero dependencies that runs in Node.js and all modern browsers, is tested against TypeScript 5.5 and later and requires strict mode, and has built-in JSON Schema conversion. It integrates with tRPC, React Hook Form and a wide ecosystem of libraries, and is also published as @zod/zod on JSR.
Recent changes: Oct 11v4.6.6 discloses that six malicious commits pushed to main on September 21 with a compromised git credential were reverted the same day and never published to npm. Releases are now staged on npm and held for approval, and array, set and map size bounds are checked before elements are parsed.
Sep 13v4.6.4 speeds up z.url() by switching to URL.canParse(); z.currencyCode(), added in the same release, was reverted in v4.6.5 the same day.
Sep 9Zod 4.6 ships .validate(), z.instanceof().properties(), z.iban(), z.withParser(), and fromJSONSchema() updates.

Sources: zod.dev, GitHub releases, v4.6.6 release notes

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TypeScript-first schema validation. Define schemas once, get static types and runtime validation. The default validator for tRPC, Next.js server actions, and AI SDKs.

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