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JSON to Zod Schema Generator
Paste a representative JSON value and generate runtime validation code plus a TypeScript type derived with z.infer.
Generate runtime validation from sample JSON
TypeScript types disappear at runtime. Zod schemas can validate API responses, form values and configuration while also producing a static type through z.infer. This generator infers strings, numbers, integers, booleans, nulls, arrays and nested objects from the sample.
Review inferred schemas before using them
One example cannot reveal every valid value. A field present in the sample may be optional in production, an empty array gives no clue about its item type, and a string that looks like a date or email may actually be unrestricted text. Adjust unions, optional fields, constraints and error messages for the real contract.
| Sample value | Generated schema |
|---|---|
| Integer | z.number().int() |
| Email-like string | z.string().email() |
| ISO timestamp | z.string().datetime() |
| Nested object | z.object({...}) |
| Mixed array | z.array(z.union([...])) |
Also compare the output with JSON to TypeScript, JSON to Schema, and JSON Schema Validator.
How to use this tool
- Paste or upload the source into the left editor.
- Choose the relevant options and run the transformation.
- Review the right-hand output, then copy or download it.
Frequently asked questions
Does this tool upload my input?
No. Processing happens in the browser.
Can I download the output?
Yes. Use the Download button after generating the result.
Should I review the result?
Yes. Generated and transformed output should be checked against the requirements of the system that will consume it.