JSON to Zod Schema Generator
Paste JSON and get a ready-to-use Zod schema — nested z.object calls, arrays, optional and nullable fields inferred, live in your browser.
This json to zod converter reads a sample and writes a matching schema so you get runtime validation and an inferred TypeScript type from one source. It composes nested z.object calls, wraps arrays in z.array, and marks a field .optional() when it’s missing from some records — the groundwork of a json to zod validator without the hand-typing. A value that is sometimes null becomes .nullable(), and mixed element types collapse into a z.union. It exports both the schema and a z.infer type, so generate a zod schema here and import it straight into your app.
How it works
- 1
Paste a JSON sample
Drop an example object or array in the left pane. Array samples help infer which fields are optional.
- 2
Read the schema
The right pane builds a live Zod schema — nested objects, arrays, optional and nullable fields, and unions where types differ.
- 3
Name and copy
Set the exported schema name, then copy the code or download a schema.ts file.
Instant & 100% private — nothing is uploaded
Everything runs locally in your browser. Your code, text and files are processed on your own device and are never sent to a server — so there are no upload waits, no size limits from us, and nothing is ever stored or logged.
Frequently asked questions
- Does it export a type as well as a schema?
- Yes. Alongside the schema it exports a `z.infer<typeof schema>` type, so you validate at runtime and get static types from the same definition.
- How are optional and nullable fields decided?
- A key missing from some elements of an array becomes .optional(); a value that is sometimes null becomes .nullable(). Both can apply to the same field.
- What about integers?
- Whole numbers are emitted as z.number().int() so the zod schema from json keeps the integer constraint; other numbers use z.number().
- Which Zod version does the output target?
- It uses the standard z.object / z.array / z.union API that works across current Zod releases. Just add zod to your project and import the file.
- Is my data sent to a server?
- No. This json to zod validator generator runs fully in your browser; nothing you paste is uploaded.
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