What Zod types are generated?

Primitives map to z.string(), z.number(), z.boolean() and z.null(); objects become z.object({ ... }); arrays become z.array(T), and a mixed array becomes z.array(z.union([...])). An empty array becomes z.array(z.unknown()).

Does it include a TypeScript type?

Yes — the output exports the schema and a matching type via z.infer , so you get both runtime validation and a static type from one definition.

Is my JSON uploaded anywhere?

No. The inference runs entirely in your browser with JavaScript — your data is never sent to a server or stored.

JSON to Zod Schema — Gera Tools

Generate a Zod schema from JSON

Zod gives you runtime validation and a static TypeScript type from one schema definition, but writing the schema to match a JSON payload by hand is slow. This tool infers a ready-to-use Zod schema plus its inferred type from a representative JSON sample.

How it works

The generator walks the sample and maps each value to a Zod validator:

JSON	Zod
string	`z.string()`
number	`z.number()`
boolean	`z.boolean()`
null	`z.null()`
object	`z.object({ ... })`
array of T	`z.array(T)`
mixed array	`z.array(z.union([...]))`
empty array	`z.array(z.unknown())`

It also exports a matching TypeScript type via z.infer<typeof schema>, so you get validation and a static type from one definition.

Example

This JSON:

{ "id": 7, "tags": ["a", "b"] }

generates:

const schema = z.object({
  id: z.number(),
  tags: z.array(z.string()),
});
type Schema = z.infer<typeof schema>;

Because the schema is inferred from one sample, add .optional() or .nullable() where your real data needs it. All inference happens in your browser — your JSON is never uploaded or stored.