JSON to Zod Schema
JSON → Zod schema plus the inferred TypeScript type. Email, URL, UUID and ISO-8601 strings are promoted to their Zod refinements.
JSON to Zod Schema — Free Online Tool
Generates a Zod schema and its inferred TypeScript type from a JSON sample, mapping objects to z.object, arrays to z.array, integers to z.number().int(), and promoting recognizable strings to z.string().email(), .url(), .uuid() and .datetime() refinements, useful for validating API responses, tRPC inputs and form payloads at runtime.
How to use the JSON to Zod Schema
- Open the tool above — it runs entirely in your browser, so your input never leaves this page.
- Paste or type your input into the field, then press the relevant button (e.g. Encode / Decode, Generate, or Convert).
- Copy the result from the output area with the copy button orCtrl/Cmd + C.
- No signup, no upload, and no tracking — repeat as often as you need.
Frequently asked questions
Which string formats are detected?
Email addresses, http(s) URLs, UUIDs and ISO-8601 date-times are promoted to z.string().email(), .url(), .uuid() and .datetime(). Turn detection off if you want every string to stay a plain z.string().
Why is a null field typed as z.unknown().nullable()?
A null in the sample carries no type information, so the schema stays permissive rather than guessing. Replace it with the real type — z.string().nullable(), for example — once you know what the field holds when present.
Do I still need a TypeScript interface?
No. The exported z.infer type is derived from the schema, so the static type and the runtime validation can never drift apart — that is the main reason to define the schema first and infer the type from it.
Free & private — why use this JSON to Zod Schema
The JSON to Zod Schema runs 100% client-side in your browser. Your data is never uploaded to a server, no account is required, and the tool is completely free. It works offline once the page has loaded and is part of a growing collection of privacy-first developer utilities.