Generate Zod validation schemas from JSON data with type inference, optional fields, and array support.
Paste a JSON value to translate its observed structure into Zod schema source for TypeScript validation. JSON strings, numbers, booleans, objects, and arrays become corresponding Zod validators, while nested values produce nested schemas. The generated result reflects the sample, not every value an API might return. Users are often surprised that omitted properties, alternate array elements, numeric bounds, and string formats cannot be established from one JSON example. The conversion runs entirely in the browser, so the pasted JSON is not uploaded.
The converter examines each JSON value and selects a matching Zod validator. A string maps to a string schema, a number to a number schema, and a boolean to a boolean schema. Object members become properties of a Zod object, with nested JSON objects represented by nested object schemas. The result describes observed value types rather than business rules.
JSON arrays are represented with Zod array validation based on their contained values. Object fields can also be emitted as optional, allowing the resulting schema to accept objects where those properties are absent. Optionality is a schema decision because a single JSON object cannot reveal whether a present member is always required. Arrays with varied element shapes require particular review.
No. It describes the shapes and primitive types visible in the JSON you supplied. It cannot discover undocumented variants, conditionally required properties, string formats, numeric ranges, or values that were absent from the sample. Compare the result with the API contract and add unions, constraints, nullability, defaults, or refinements where the contract requires them.
No. An optional property may be absent from an object, while a nullable property may be present with the JSON value null. A property can also be both optional and nullable. JSON samples cannot establish optionality merely by including a property, so review optional-field choices separately from any null values present in the pasted data.
The behavioral notes were checked against the browser implementation. Standards and primary references below define the relevant format, formula, or platform behavior.
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