Which JSON Schema draft does the validator use?

Draft-07, with allErrors mode (all violations are reported, not just the first), strict:false (extra keywords are ignored rather than causing an error), and the ajv-formats package loaded for format validation (email, uri, date-time, etc.).

Does it validate the schema itself?

Yes. The schema is validated first. If the schema itself is malformed, a schema validation error is shown with the location so you can fix the schema before testing against it.

Can it validate against a remote schema?

This tool validates against a schema you paste locally. For remote schema references (id/uri in $id/$ref), a network fetch would be required — the tool currently validates only the local schema document.

Is my JSON uploaded anywhere?

No. All validation runs in your browser using Ajv; the schema and document are never transmitted or stored.

JSON Schema Validator

Validate a JSON document against a JSON Schema (draft-07 + formats) — live, in your browser.

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Validating JSON Against a Schema: A Practical Guide to JSON Schema

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Related guides

Validating JSON Against a Schema: A Practical Guide to JSON Schema

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