JSON Schema Validator & Mock
Validate JSON against a JSON Schema (draft 2020-12) and generate seeded test data from it (Mock Data Studio: JSON, CSV, TS fixtures).
About this tool
Check a JSON document against a JSON Schema and get each violation with the path in the data and the schema keyword that failed, or generate deterministic example data from a schema. Local $ref pointers are resolved; remote references are not fetched.
Mock output is built from the schema's examples, defaults, enums and constraints, so it is stable between runs. It is sample data, not random or realistic fixtures. At most 100 errors are listed.