JSON Schema Generator

About this JSON Schema Generator

JSON Schema describes the shape of JSON data: required properties, types, arrays, and nested objects. Generating a draft schema from sample data accelerates API design and validation setup.

Inferred schemas are a starting point. You should tighten enums, formats (email, uri), and required fields based on product rules—not only on one lucky sample.

Generation here is client-side from the sample you provide.

How to use this tool

Paste representative sample JSON (include edge cases if you can).
Generate the schema and review inferred types.
Edit the schema for required fields and constraints.
Use it in validators, OpenAPI, or contract tests.

Common use cases

Kickstart OpenAPI / AsyncAPI components
Document webhook payloads
Add validation in CI for fixtures

FAQ

Is the schema complete?

Inference from one sample under-specifies unions and optional fields. Multiple samples are better.

Which draft is produced?

Treat output as a draft you version in your repo; align with your validator’s draft support.

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