JSON to Zod Schema
Generate Zod validation schemas from sample JSON instantly.
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How to Generate a Zod Schema from JSON
Paste a sample JSON payload and the tool generates Zod object schemas with named nested schemas and an inferred TypeScript type. Paste the result into your project and call RootSchema.parse() to validate data at runtime.
Why Zod?
TypeScript types disappear at runtime, but API responses arrive at runtime. Zod schemas validate the actual data and derive the static type from the same source of truth, eliminating the type-cast-and-hope pattern.
Common Use Cases
Developers generate Zod schemas to validate API responses, parse environment configs, guard tRPC and form inputs, and add runtime safety to existing TypeScript interfaces.
Frequently Asked Questions
What does the generated schema include?
A z.object() schema for every object in your sample, nested schemas referenced by name, z.array() for arrays, and an exported z.infer type so you get static types and runtime validation from one definition.
Which Zod version does the output target?
The output uses the standard z.object/z.string/z.number/z.array API, which works with both Zod 3 and Zod 4.
How are mixed-type arrays handled?
Arrays containing multiple types generate z.array(z.union([...])) so every observed type validates.
Should I refine the generated schema?
Yes - the generator infers structure from one sample, so add .optional(), .nullable(), .email(), or stricter constraints where your real data varies.