Question 1

What is JSON Schema validation?

Accepted Answer

JSON Schema validation checks whether a JSON document conforms to a defined structure (schema). The schema specifies data types, required fields, value constraints, and patterns. QTool.io's validator supports JSON Schema Draft 4, 6, and 7 with detailed error reporting.

Question 2

What JSON Schema drafts are supported?

Accepted Answer

QTool.io's JSON Schema Validator supports Draft 4, Draft 6, and Draft 7 features including type, required, properties, items, minimum/maximum, pattern, enum, const, anyOf, oneOf, allOf, not, $ref, if/then/else, format validation, and more. The draft version is auto-detected from the schema.

Question 3

Is this JSON Schema validator free?

Accepted Answer

Yes, QTool.io's JSON Schema Validator is completely free. It runs entirely in your browser with no server calls, so your data stays private. No signup or installation required.

Question 4

Does the validator show error line numbers?

Accepted Answer

Yes, the validator provides detailed error messages with JSON paths, keyword context, and highlights the corresponding lines in the data editor. Each error shows the exact path to the failing value and which schema keyword caused the failure.

Free JSON Schema Validator

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