JSON Schema Validator & Diff

Validate JSON against a JSON Schema, or get a structured diff between two JSON documents.

JSON data

JSON Schema

How to validate or diff JSON

1
Pick a modeChoose Validate to check JSON against a schema, or Diff to compare two JSONs.
2
Paste your dataDrop the JSON, plus the schema or the second document.
3
Read the reportErrors and changes appear in a structured table you can scan instantly.

What JSON Schema versions are supported?

Draft 2020-12 and Draft 2019-09 by default, with backward support for Draft 7.

Does the diff handle nested arrays?

Yes. Each change is reported with a JSON Pointer path and old/new values.

Are validation errors easy to read?

Each error includes `instancePath`, `keyword`, and a plain-English message.

Can I diff two large JSON files?

Yes — within request size limits. The summary tells you total added, removed, and changed.

Does the diff treat key order as a difference?

No. Object key order is ignored; only value changes are reported.

Is my JSON stored?

No. Both JSONs are processed in memory and discarded after the response.

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