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JSON to Zod Schema Converter

Convert JSON into TypeScript interfaces, type aliases or a Zod schema live, with real optional-field detection across arrays.

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Result

This page opens the converter with Zod schema preselected as the output format — paste a JSON object or array and it prints a const schema built from z.object(), z.array(), z.union() and primitive calls like z.string() or z.number(), ready to validate that shape of data at runtime.

The same field-comparison engine that powers the interface mode drives this output: a field present in only some items of a pasted array gets .optional() appended, and a field seen as both null and a real value gets .nullable() instead of a raw union, matching how Zod schemas are normally written by hand.

Zod is a separate npm package (npm install zod) that this tool does not install for you — it only generates the schema source, which you paste into a project that already depends on zod. Need plain TypeScript types instead? The same JSON also converts to interfaces or type aliases without leaving this page.

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Executed in Browser

Your files and inputs never leave this device. Processing runs completely offline. 100% Secure.

Accepted Formats & Rules

  • Recursively infers a named interface for every nested object and every array of objects.
  • Merges array element shapes field by field, so a field only present in some items becomes optional.
  • Live conversion on every keystroke, with invalid JSON reported inline instead of crashing the page.

Key Benefits

✓ 100% Offline: your JSON payload and the generated types never leave this device.
✓ Real optional-field detection: comparing every object in an array and marking fields missing from some of them as optional, not a guess.
✓ Three output formats from one inference engine: TypeScript interface, type alias, or a ready-to-paste Zod schema.

Use Cases

  • • Paste a REST or GraphQL API response and get typed interfaces for it in seconds, instead of hand-writing them field by field and missing an optional one.
  • • Check whether a field your frontend relies on is actually present on every record: paste an array of sample records and see which fields the tool marks optional (?) because some items lack them.
  • • Generate a Zod schema straight from a sample payload to validate untrusted JSON (webhooks, third-party APIs, user uploads) at runtime, not just at compile time.