JSON Schema Validator

JSON Schema describes the expected structure of a JSON document — which fields are required, what type they are, and what constraints apply to their values. This tool checks actual data against a schema and shows the exact path to every violation.

How to use it

• Paste a JSON Schema into one field and the data to validate into the other.
• The result lists each violation separately: the exact path to the problem field and a plain-language explanation of why it doesn't match the schema.
• Valid data is immediately flagged as fully compliant with the schema.

Common uses

• Checking a third-party API response against its documented schema before integrating with it.
• Debugging your own JSON Schema — figuring out why seemingly valid data gets rejected.
• Validating a configuration file against a schema before deploying.

Things to keep in mind

JSON Schema has several versions (draft-07, 2019-09, 2020-12) with small syntax differences — check which version your production validator actually expects.

required only checks that a field is present, not its value — an empty string or null still counts as "present" if the type allows it.