What is a JSON to Zod generator?
It reads valid JSON and infers Zod validators that describe strings, numbers, booleans, nulls, objects, arrays, nested fields, and practical unions.
JSON to Zod Schema Generator
Paste JSON and generate clean Zod validation schemas locally with nested objects, arrays, optional fields, and TypeScript-friendly output.
Paste JSON or load a sample to begin.
JSON Input
Objects, arrays of objects, nested values, primitives, nulls, and mixed arrays are analyzed locally.
Zod Schema Output
Generated schemas are deterministic, readable, and ready to copy into a TypeScript file.
Generation details
Validation, summary, and warnings
Generate a Zod schema to see JSON validation status, inferred schema counts, fields, arrays, and warnings.
JSON to Zod Guide
Generate runtime validation schemas from JSON examples
Convert API responses, fixtures, configuration examples, and mock data into Zod schema code locally without uploading JSON.
Runtime validation
Zod schemas validate data at runtime, so generated output can help check API payloads, form data, configuration files, and test fixtures before your app trusts them.
Nested objects and arrays
Objects can become named schemas, while arrays of objects are merged into one shape. Empty or ambiguous arrays fall back to unknown with a warning.
Optional vs nullable fields
Missing fields can become optional, while explicit null values can become nullable. Enable both when a sample shows values that may be absent or intentionally null.
Zod schema vs TypeScript interface
A TypeScript interface only helps during development. A Zod schema can validate unknown data at runtime and can also infer a TypeScript type with z.infer.
Quoted property names
Original property names are preserved by default. Names that are not valid JavaScript identifiers are emitted as quoted object keys in the generated schema.
Date strings and enums
Date and enum detection are off by default because JSON examples are not full contracts. Enable them when repeated strings or ISO timestamps represent intentional constraints.
Privacy
Parsing and schema generation run locally in your browser. JSON input, generated schemas, property names, values, and errors are not uploaded or logged.
JSON to Zod FAQ
Does this tool upload my JSON?
No. JSON parsing and Zod schema generation run locally in your browser.
Can it generate schemas from an array of objects?
Yes. Arrays of objects are merged into one object schema, and fields missing from some array items can be marked optional.
What happens with mixed arrays?
Simple mixed primitive arrays may generate a Zod union. Arrays that mix objects with primitive values fall back to unknown with a warning.
Should null become optional or nullable?
Nullable means the value may explicitly be null. Optional means the property may be absent. This generator can apply both when a sample includes null.
Does the output require Zod to be installed?
The generated code is text. Your project needs Zod only when you copy the schema into an app and run it there.
Can generated Zod replace a hand-written contract?
Use generated schemas as a fast starting point, then review names, enums, dates, numeric constraints, and domain-specific validation manually.