JSON to Zod Schema Generator
Infer a Zod validation schema from JSON, including nested objects, arrays, unions, nullable values and fields missing in sample records.
Start with your input
Edit the example or replace it with your own text.
Choose your options
These settings are optional. Keep the defaults to get started.
How to use JSON to Zod Schema Generator
- Paste a JSON value or an array of representative records.
- Choose whether generated object schemas should reject unknown keys.
- Generate TypeScript code, install Zod in your own project, and refine validation rules before accepting production input.
Infer structure without guessing business rules
The generator uses observed primitive types and merges object shapes across array members. Keys absent from some samples become optional, while explicit null remains nullable. Mixed element types create unions, and empty arrays use z.unknown() for their elements. Strings stay strings: an example that resembles an email or date does not establish a validation contract.
Validate data at the boundary
The output imports Zod and exports schema plus an inferred TypeScript type. It does not add Zod to this website or run arbitrary generated code here. Review required fields, bounds and formats in your application. Strict mode rejects unknown keys; the normal z.object behavior strips unknown keys when parsing. The generated root follows the input shape, so a JSON array produces an array schema.
Example input
[{"id":1,"name":"Ada","active":true},{"id":2,"name":null}]Is a TypeScript interface enough to validate an API response?
No. Type annotations are erased at runtime. A schema parser can check the actual response when your application receives it.
Is input uploaded?
Processing takes place in your browser. This tool does not send your input or selected files to a conversion API.