JSON to Zod Schema
Paste a JSON sample; get a TypeScript Zod schema (z.object({...})) ready to use at API boundaries. Zod gives both runtime validation and inferred TypeScript types from one definition — much safer than casting parsed JSON.
How to use the JSON to Zod Schema
Paste a JSON sample (or an array — the tool merges shapes). Output is ready-to-import Zod code. Pipe through YourSchema.parse(unknownInput) at API boundaries to get a typed value or a thrown error.
Generating Zod schemas from JSON
Parsed JSON in TypeScript is any until you prove otherwise, and a bare type assertion is a lie the compiler believes — it does nothing at runtime, so malformed data sails straight through. Zod fixes that by defining a schema once and getting both runtime validation and a static type inferred from it.
This turns a JSON sample into a Zod schema (z.object({...})), inferring field types, detecting ISO date strings, and optionally marking fields required, so you can call Schema.parse(input) at an API boundary and get back a fully typed value or a thrown error. If you pass an array it merges the shapes. For Python, the JSON to Pydantic generator is the equivalent on that side.
Common use cases
- Validate at boundaries — parse untrusted JSON into a typed value safely.
- One source of truth — derive the TypeScript type from the same schema.
- Catch ISO dates — detect date strings and validate their format.
- Merge a sample array — infer a schema from several example records at once.
- Replace casts — swap unsafe type assertions for real runtime checks.