JSON Schema Validator
Paste a JSON Schema and data to validate. See detailed error messages with paths to the exact failing fields.
Paste a JSON Schema and JSON data, then click Validate.
How to use the JSON Schema Validator
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Paste your JSON Schema.
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Paste your JSON data.
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Click Validate and review any errors.
What is JSON Schema validation?
JSON Schema defines the shape of valid JSON — required fields, types, patterns, constraints. This tool uses the AJV validator and shows errors with human-readable paths like 'data.items[2].email: must match format "email"'. All validation runs locally.
Key features
- Supports Draft 4, 6, 7, and 2020-12
- Detailed error messages with instance paths
- Fast client-side validation with AJV
- Your JSON data never leaves your browser
Frequently asked questions
Which JSON Schema drafts are supported?
Drafts 4, 6, 7, and 2020-12. Most real-world schemas use Draft 7 or 2020-12.
Can it validate large files?
Yes — it runs in your browser, so files up to several MB work fine depending on your device.
Is my JSON data uploaded?
No. Validation is done entirely in your browser.