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Zod v4

Test Zod schemas before they become production contracts

Paste a Zod schema expression, run safeParse against JSON data, inspect issues, export JSON Schema and copy TypeScript type snippets from one private browser workflow.

  • Dedicated worker
  • safeParse results
  • JSON Schema export

Schema-first validation without setup

Zod is often the fastest way to turn TypeScript-shaped validation rules into a runtime contract. This playground focuses on the decision loop: does the schema accept the payload, what issues are returned, what type would be inferred, and whether the schema can be represented as JSON Schema.

Evaluation runs in a dedicated browser worker. Payloads are not sent to a backend; the worker is terminated on timeout and network/persistent browser APIs are blocked for the public playground.

When this route is useful

  • Checking form and config validation before wiring it into an app.
  • Debugging API payloads and webhook shapes without project setup.
  • Explaining what z.infer will expose to TypeScript callers.
  • Seeing when JSON Schema export works and when a Zod feature is runtime-only.

Run safeParse

Use a preset or paste your own Zod expression. The schema should return a Zod type directly or assign it to a variable named schema.

Object schema with uuid, email, enum and boolean fields.

Zod schema

Use the z namespace. Example: z.object({ email: z.string().email() }).

JSON payload

The payload must be valid JSON. It is parsed before safeParse runs.

Run safeParse to see validation status, issues, JSON Schema and TypeScript snippets.

Runtime-only Zod features

Refine, superRefine, preprocess, transform, custom validators and recursive schemas can validate correctly while still being hard or impossible to express as JSON Schema. The playground labels those cases instead of pretending the type preview is complete.

Zod vs JSON Schema

Zod is ergonomic when TypeScript developers own the runtime validator and want inferred types close to the source code. JSON Schema is stronger when the contract must travel between languages, services and external tooling. This route helps compare both views on the same example.

FAQ

Does the playground upload my schema or payload?

No. The MVP evaluates in a browser worker and does not send pasted data to a backend service.

Is the expanded type preview authoritative?

No. The copyable z.infer snippet is the canonical TypeScript path. The expanded preview is best-effort and labels unsupported constructs.

Why can JSON Schema export fail?

Some Zod features are runtime logic rather than portable schema structure. In those cases the safeParse result remains useful, but export is marked unsupported.