What does JSON Schema Validator actually do?

The JSON Schema tool checks a JSON instance against a schema you paste. It reports validation errors from that schema. It does not fetch $ref URLs, so remote refs fail or stay unresolved. Draft support is whatever the bundled validator implements.

When should I use JSON Schema Validator?

Use it to see why a payload failed a schema you already have.

When should I not use JSON Schema Validator?

Do not point $ref at the public internet and expect this page to download it.

What does JSON Schema Validator not do?

No network $ref resolution. A schema that “passes” only describes the instance you pasted.

JSON Schema Validator

Validate JSON data against a JSON Schema with detailed error paths and reasons. Free online — runs locally, no upload.

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JSON Schema Validator