Two schema drafts
Use Draft-07 or Draft 2020-12 with automatic detection from the declared $schema.
JSON Schema Validator Online
Check required fields, data types, constraints, and local references without uploading JSON or schemas.
Ready to validate0 validation errors
Standards-aware validation
Find schema errors
at the exact data path.
Safe local references
Resolve local JSON Pointer references while blocking remote schema loading.
Lossless numbers
Compare large integers and high-precision decimals without converting them to JavaScript Number values.
Worked example
See JSON Schema Validator in action.
Validate JSON against Draft-07 or Draft 2020-12 schemas with precise error paths.
Data: {"age":17}
Schema: {"type":"object","properties":{"age":{"minimum":18}}}Invalid · /age · minimum · must be at least 18
Real questions, clear answers
JSON Schema Validator FAQ
Which JSON Schema drafts are supported?
The validator supports Draft-07 and Draft 2020-12. A declared $schema takes priority; unknown dialects are rejected instead of silently downgraded.
Can the validator load remote $ref schemas?
No. Local # references resolve inside the pasted schema, while HTTP, HTTPS, and other external references are blocked and never fetched.
Are large numbers validated precisely?
Yes. Numeric constraints compare the original decimal tokens, so large integers and high-precision decimals are not converted to JavaScript Number values.