JSON Schema Validator
What is JSON Schema?
JSON Schema is a vocabulary for describing the structure and constraints of JSON data. It defines what properties are required, their types, formats, ranges, and patterns. Validating JSON against a schema catches data issues early — before they reach your application logic or database. Common uses include API request/response validation, configuration file validation, and form data verification. This tool uses the AJV library (the most popular JSON Schema validator) and supports Draft-07, Draft 2019-09, and Draft 2020-12.
How to Use the JSON Schema Validator
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Paste your JSON data into the left panel and your JSON Schema into the right panel.
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Click 'Example' to load a sample JSON + Schema pair if you want to see it in action.
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Select the schema draft version that matches your schema (Draft-07 is most common).
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Click 'Validate' — a green message confirms the JSON is valid; red lists every error with its path.
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Fix the errors and re-validate until the JSON passes.
Keywords: JSON schema validator, validate JSON online, JSON schema checker, AJV validator, JSON schema draft-07, JSON validation tool, JSON schema tester