JSON to Zod Schema
Create an executable Zod validator from representative JSON data.
Generate runtime validation with Zod
TypeScript types disappear at runtime, while Zod schemas can verify that fetched or submitted data really has the expected shape. This generator parses a JSON object and constructs nested z.object calls, z.array validators, scalar validators, and integer constraints. Keys that are valid JavaScript identifiers remain readable, while unusual keys are safely quoted in the output.
The default object generates userSchema with user_id as z.number().int(), name as z.string(), and active as z.boolean(). A nested settings object becomes another inline object schema, and a populated array receives a validator for its first item type. Copy the result into a boundary where untrusted JSON enters your application, then infer a static type from it if desired.
Refine the inferred schema before use
The sample cannot expose optional keys, refinements, string formats, or unions that are not present. Null is represented explicitly, and an empty array accepts unknown members because no example establishes a narrower type. Schema generation happens in your browser. Add email, URL, date, range, optional, and transform rules based on the actual business contract rather than the example alone.
Frequently Asked Questions
Is the output executable Zod code?
Yes. It imports z from Zod and exports a schema variable built from object, array, and scalar validators.
Does it add email or URL validation automatically?
No. A JSON string does not reveal its intended semantic format, so refinements must be added intentionally.
What validator is used for an empty array?
The output uses an array of unknown because no element exists from which to infer a type.
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