JSON Schema Validator

It means the value at the reported path breaks a rule defined in the schema: wrong type, a missing required property, a pattern mismatch, or a value outside the allowed range. Each error comes with an exact path and explanation.

Validation targets draft-07 style — the most common set of keywords (type, required, properties, pattern, minimum/maximum, enum, and so on).

Yes, both the schema and the data are processed entirely in your browser via JavaScript, with nothing sent to a server.