JSON Schema Validator
Test JSON instances against the intended Schema draft and trace each failure to its data path and governing keyword.
JSON Schema
Type, paste, upload or drop a .json file
JSON Data
Type, paste, upload or drop a .json file
A recognized $schema declaration overrides the selector. External references are never fetched; internal $ref, $defs and draft-specific references are resolved locally.
Ready to validate
Enter a Schema and JSON Data, then click Validate JSON.
Validation runs in a temporary browser worker. Your Schema and JSON Data are not uploaded, stored or used to resolve network references.
How to use JSON Schema Validator
- 1
Paste, upload or drop the JSON Schema and JSON Data into their corresponding editors.
- 2
Choose Draft 2020-12, 2019-09, Draft-07 or Draft-04, or use the draft declared by the schema.
- 3
Enable Show All Errors when you need more than the first validation failure.
- 4
Click Validate JSON and review the effective draft plus every reported instance and schema path.
- 5
Copy the validation report or download it for later review.
Frequently asked questions
About JSON Schema Validator
JSON Schema changes across drafts, so validation is meaningful only when the vocabulary is known. This workspace supports four widely used versions and reports the effective choice instead of silently treating every schema as the newest draft. Schema compilation and instance validation run in a worker to keep the interface responsive.
Each failure carries human-readable context plus instance and schema locations, allowing developers to connect bad data with the keyword that rejected it. The tool does not fetch arbitrary remote references or submit schemas to a service. Copyable and downloadable reports preserve the local findings for issue tracking or API review.