JSON Schema Validator Online

Free online JSON Schema tester that enforces types, required fields, and constraints on sample payloads.

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Free online JSON Schema tester that enforces types, required fields, and constraints on sample payloads.

How it works

This tool validates a JSON document using a provided JSON Schema. It’s useful for enforcing API contracts and configuration rules.

Schema:
{"type":"object","properties":{"age":{"type":"number"}},"required":["age"]}

Data:
{"age":"30"}

Output:
Invalid (age must be number)

It defines rules for JSON structure and types, commonly used for API validation and form constraints.

Yes. Features vary by draft version. Ensure your schema draft matches the validator implementation you’re targeting.

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