JSON Schema Validator
JSON Tools
Validate a JSON instance against a JSON Schema.
Schema and instance data
Separate editors keep the schema and the JSON instance easy to inspect.
JSON Schema
JSON instance
Validation result
Ready to validate
Use cases
When to use JSON Schema Validator
Validate a JSON instance against a JSON Schema.
1Check an API response against a contract
2Review required fields before frontend integration
3Test a configuration schema with representative data
4Compare JSON structures across development, staging, and production APIs
5Prepare reproducible JSON payloads for API documentation, bug reports, or test cases
6Generate Schemas, language models, Excel workbooks, or Postman requests from JSON samples
7Review duplicate keys, nulls, field types, and contract changes before release
Guidance
Get reliable results
- 1Keep schema and instance in separate editors
- 2Define required fields and property types explicitly
- 3Review nested error paths instead of reading only the first message
The validator runs locally with Draft-07 compatibility and does not fetch remote $ref schemas.