API Design
API Error Format Checker
Paste an API error response JSON to validate against RFC 7807 Problem Details format, check for information disclosure risks, and validate field-level error structure.
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About this tool
API Error Format Checker
The API Error Format Checker validates error JSON against RFC 7807 Problem Details format, detecting stack trace exposure, missing machine-readable codes, and field-level validation error structure.
• Validate an error response format before publishing to an API spec
• Check whether a validation error response includes field-level details
• Detect stack traces in error responses that expose implementation details
• Ensure error responses use machine-readable codes alongside human-readable messages
Next step
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FAQ
What does this tool tell you?
The API Error Format Checker validates error JSON against RFC 7807 Problem Details format, detecting stack trace exposure, missing machine-readable codes, and field-level validation error structure.
What affects the result most?
RFC 7807 Problem Details: type (URI), title (human-readable), status, detail, instance fields. Content-Type for errors: application/problem+json — distinct from application/json for error detection. Error envelope pattern: {error: {code, message, details}} — common but non-standard.
How should I use the result?
Treat the tool's output as a first-pass check, not a proof of correctness. A clean pass means no issues in the patterns this tool recognizes; a failure points to a specific problem you can investigate in your source. The underlying spec is the authoritative source for edge cases.
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