JSON to Zod
- z.infer type
- Optional keys
- Instant
Zod schemas plus the inferred TypeScript type, from a sample document.
Paste input on the left to see zod.
Everything runs in your browser — nothing is uploaded.
About zod
Generating a Zod schema from JSON gives you runtime validation and a static TypeScript type from a single definition. JSONic extracts nested objects into named schemas, detects integers, marks inconsistent keys optional, and exports the inferred type so the schema remains the single source of truth.
Zod gives you runtime validation and a static type from one definition, which is why it has become the default way to validate API boundaries in TypeScript. Paste a sample response to get the schema, with nested objects extracted into their own named schemas, integers detected as z.number().int(), and the inferred type exported alongside so you never define the shape twice.
Questions
Which Zod version does this target?
Zod 3 syntax, which Zod 4 also accepts for everything generated here.
Should I use the generated schema as-is?
As a starting point. A sample cannot tell you that an email field must be an email or that a quantity must be positive — add .email(), .min(), .uuid() and the rest where you know the real constraints. That refinement is the whole point of runtime validation.
Why is the inferred type exported too?
So the schema is the single source of truth. z.infer keeps the static type in step with the validator automatically, instead of leaving you to maintain a duplicate interface.