JSON Schema Validator
Validate JSON payloads with clear fixes.
Paste a JSON Schema and payload. We validate locally, show the failure path, and explain how to fix the payload.
Schema + payload
Validation
Waiting for inputSummary
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Errors
- Waiting for schema and payload.
Schema validation tips
Required fields
Missing properties are reported as required. Check naming and nesting paths.
Type mismatches
Strings vs numbers is the most common mismatch. Confirm types at every path.
Additional properties
If additionalProperties is false, remove unexpected keys or update the schema.