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JSON Schema Validator (Draft 2020-12)

Validate a JSON or YAML document against your own JSON Schema using Draft 2020-12. Errors are grouped by instance path so you can see precisely which parts of the document fail, all without sending anything to a server.

Processed locally in your browser
Inputjson
Loading editor…
JSON○ Not checked0 lines0 chars0 B

How to use the json schema validator

  1. Put your document (JSON) in the input editor and your JSON Schema in the schema editor.
  2. Press Validate against schema. Validation uses AJV with Draft 2020-12.
  3. Errors are grouped by instance path so you can see exactly which fields fail.
  4. If the schema itself is invalid, that is reported separately from data errors.

Example: Validating a required field

Input
{ "name": "Ada" }
Output
Error at (root): missing required property "age".

The schema requires both name and age; the missing field is reported with its path.

Frequently asked questions

Which JSON Schema draft is supported?
Draft 2020-12, via the AJV validator, including keywords like prefixItems and unevaluatedProperties.
Are remote $ref schemas fetched?
No. To keep everything private and offline, remote references are not fetched. Provide the full schema locally.
Can I validate YAML against a schema?
Yes. YAML is parsed to a data value first and then validated against your JSON Schema.
Where does validation run?
Entirely in your browser. Neither the schema nor the document is sent anywhere.