JSON to Zod Schema
Paste a JSON sample and generate a Zod v4 schema with chained validators for every field, including nested objects, arrays, enums, nullables and optionals. Runs entirely in your browser.
How to use
- Paste any JSON sample — object, array, or scalar.
- Click Generate Zod Schema (or let auto-convert run).
- Copy the generated schema, or download it as a .ts file.
The tool infers enums from string arrays when every value is a distinct string, wraps optional keys when a field appears as null, and builds nested z.object() / z.array() recursively.
Frequently Asked Questions
How does JSON to Zod work?
It inspects the structure of your JSON sample and infers the most specific Zod chaining for each value — numbers, strings, booleans, nullables, arrays, enums and nested z.object() schemas.
What does it output?
A complete TypeScript file with z.object({...}) schemas, chained validators for each field, and a z.infer output type. Copy it into your project and run npm/yarn add zod.
Does it upload my JSON?
No. Everything is processed locally in your browser. Your data never leaves your device.
Which Zod version is it for?
The output targets Zod v4 (the current major version). In Zod 4 you do not need the .strict() suffix — objects are strict by default via z.coreSchema().