Paste your JSON and schema
Drop in the data you want to check and the JSON Schema it should follow.
JSON Schema Validator
Paste JSON and a JSON Schema, validate the data against it, and see every violation with its exact path — all processed locally in your browser.
How it works
Click Validate
The schema is checked against type, required, range, pattern and other common keywords.
Fix each violation
Every failure lists the exact property path so you know precisely what to change.
FAQ
Which JSON Schema keywords are supported?
Common keywords including type, required, properties, items, enum, const, pattern, minimum/maximum, minLength/maxLength, minItems/maxItems, uniqueItems and additionalProperties.
Is my data uploaded anywhere?
No. Both the JSON and the schema are validated locally in your browser and never leave your device.
Does it support $ref or nested schema files?
No, this tool validates a single self-contained schema. External and internal $ref resolution is not supported.