JSON to Zod Schema ジェネレーター

What Is JSON to Zod Schema Generator?

JSON to Zod Schema Generator is a free online tool that analyzes a JSON object and produces the corresponding Zod schema with a ready-to-use z.infer type export. It is designed for TypeScript developers who work with API responses, form data, or configuration objects and want to add runtime validation without writing schemas by hand.

How to Use JSON to Zod Schema Generator

1. Paste your JSON into the left panel, or click Load Sample to see an example.
2. Set the variable name for the exported schema (defaults to schema).
3. The generated Zod schema and inferred TypeScript type appear instantly in the right panel.
4. Click Copy to copy the result to your clipboard.

Features

• Generates complete Zod schemas for objects, arrays, and all primitive types
• Recursively handles nested objects and arrays
• Produces z.infer type export alongside the schema
• Marks null fields as z.null().optional()
• Distinguishes integers (z.number().int()) from floats (z.number())
• Runs entirely in your browser — zero data uploaded

FAQ

What is a Zod schema?

Zod is a TypeScript-first schema validation library. A Zod schema describes the shape and constraints of your data, and can automatically infer TypeScript types using z.infer<>.

How are null values handled in the generated Zod schema?

Fields with null values are generated as z.null().optional(), indicating the field can be null or absent. You can adjust these to z.string().nullable() if the field can also hold other types.

Does the converter handle nested objects and arrays?

Yes. Nested objects are recursively converted to z.object() schemas, and arrays are wrapped in z.array(). The inferred item type is based on the first element in the array.

Is my JSON data sent to a server?

No. All conversion runs entirely in your browser. Your data never leaves your device.