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JSON to Zod Schema

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JSON input
Zod schema
Ctrl+Enter Generate Schema

JSON to Zod Schema Generator

Paste a JSON sample and get a working Zod schema in seconds. Handles nested objects, arrays, and nullable fields. Each object becomes a named schema with a TypeScript type export via z.infer. Runs entirely in your browser.

Where Is This Useful?

API response validation
Paste a real API response to generate a schema, then validate every response against it before trusting the shape. Pair with JSON Schema Validator for structural checks too.
React Hook Form setup
Generate a Zod schema from your form data structure, then drop it into zodResolver() from@hookform/resolvers/zod. Type-safe forms in minutes.
tRPC and Next.js
tRPC uses Zod for input validation on procedures. Generate the schema from a sample payload, add refinements, and you have validated, typed API inputs without any extra boilerplate.

How to Use

  1. Paste a JSON object or array in the input panel
  2. Set a root schema name (defaults to Root)
  3. Click Generate Schema or press Ctrl+Enter
  4. Review the generated schema and add refinements like .email(), .min(), or .optional() as needed
  5. Copy or download the .ts file

What Gets Generated

  • z.object() for JSON objects — nested objects become separate named schemas
  • z.string(), z.number().int(), z.boolean(), z.null()
  • z.array() with inferred item types, including unions for mixed arrays
  • Nullable fields get .nullable() chained automatically
  • TypeScript type exports via z.infer<typeof Schema>

Frequently Asked Questions

What is Zod?

Zod is a TypeScript-first schema validation library. You define a schema once and use it to validate data at runtime while getting full static type inference — no duplicated type declarations needed.

How is this different from JSON to TypeScript?

JSON to TypeScript generates static interface declarations for compile-time checking only. Zod schemas also validate data at runtime — essential when receiving data from APIs, user forms, or external services.

Is the generated schema production ready?

It's a solid starting point. You'll likely want to add .optional() for fields that may be absent, .email() for email strings, and .min() or .max() for length constraints based on your actual requirements.

Does it handle arrays?

Yes. Arrays are wrapped in z.array() with the inferred element type. If array items have mixed types, a z.union() is used inside the array.

Can I use this with React Hook Form?

Yes. Generate the schema here, install @hookform/resolvers, then pass your schema to zodResolver() in your form setup. The inferred type also covers your form data type.

Is my JSON uploaded anywhere?

No. Everything runs locally in your browser. Your data never leaves your machine.

Does it work on mobile?

Yes. Use Generate in the sticky bar and copy or download from the sheet.

What if my JSON is invalid?

Fix the syntax first using the JSON Validator or JSON Repair, then paste again.

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