fact_check JSON Schema Validator
Validate JSON data against a JSON Schema (Draft-07 subset) - fully client-side.
Enter a schema and JSON data above to see validation results.
A JSON Schema defines the expected structure, types, and constraints for JSON data - like specifying that a "name" field must be a string, or an "age" field must be a positive number. This tool validates a piece of JSON data against a schema and reports whether it conforms, along with details on any violations.
Frequently asked questions
It follows standard JSON Schema conventions covering the most commonly used validation keywords (types, required fields, patterns, ranges) - check specific advanced/newer draft features against your schema if you rely on less common keywords.
The tool reports which parts of the data violate the schema - such as a missing required field, wrong data type, or a value outside an allowed range - so you can pinpoint and fix the issue.
Yes for this tool - if you don't have a schema yet and want one generated automatically from sample data, use the JSON Schema Generator tool instead.