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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
JSON Schema Validator enforces structure, required keys, and type constraints against a schema definition. It is ideal for API contract testing and CI quality gates. Keep schema versions aligned across services to avoid drift.
Example
Schema:
{"type":"object","properties":{"age":{"type":"number"}},"required":["age"]}

Data:
{"age":"30"}

Output:
Invalid (age must be number)
FAQ
When should I validate with schema instead of plain JSON checks?
Use schema validation whenever data shape and type guarantees matter, such as API requests, events, or configs.
How do I avoid schema drift across teams?
Version schemas, test in CI, and publish canonical schema artifacts consumed by all services.
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