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JSON Schema Generator

Paste an example of your JSON and get a JSON Schema describing it, as a starting point for validation and documentation.

Runs in your browser · No uploads

Generate JSON Schema

  • Nothing leaves your device
  • No server-imposed size limits
  • No sign-up, no watermark
  • Free

How to generate a JSON Schema

  1. Paste your JSON, or try the example.
  2. Choose required fields, formats and whether extra properties are allowed.
  3. Copy or download the schema.

What you get

  • A schema for draft 2020-12 with types for every value.
  • "required" lists the fields present in every item.
  • Formats (date-time, date, email, uri, uuid) when every example value matches.
  • Optionally additionalProperties: false, to reject unknown fields.

Frequently asked questions

Is my JSON uploaded?

No. Everything happens in your browser, and the page is blocked from uploading anything.