JSON Schema validator and example generator

  1. Input
  2. Result

Supports draft-07 by default, or 2020-12 when declared in the schema, with local references, combinations and formats. Remote references are not fetched. Each input is limited to 128 KiB, depth 40 and 10000 nodes; processing is stopped after 3 seconds.

Validate JSON by schema online

Check JSON data against common JSON Schema fields such as type, required, properties, enum, ranges and string limits.

The generated example helps document API payloads and create quick test data from the same schema.

Quick start

Validate JSON locally against draft-07 or 2020-12, with a downloadable report.

  1. Enter the schema and JSON document
  2. Run validation
  3. Review paths and rules, then export the report
✓ The tool runs directly in the browser and is ready for quick checks without installing software.
✓ Input can be cleared and recalculated immediately, which is useful for repeated small tasks.
✓ Use fullscreen mode when you need more space for long text, structured data or large result blocks.
✓ Copy buttons are available on generated output so results can be reused in code, documents or support chats.
✓ Most operations are deterministic: the same input and options produce the same output.
✓ For sensitive content, prefer local browser tools and review the result before sharing it further.

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