API Error Response Quality Checker
Evaluate error response shapes and consistency across OpenAPI specs. Surface missing problem+json patterns and error contract gaps. Free by Graph Tools.
Use this free API error response quality checker to evaluate how consistently your OpenAPI spec defines error responses. The tool inspects 4xx and 5xx response schemas for adherence to RFC 7807 problem+json patterns, checks for consistent error field names across operations, and flags operations that declare no error responses at all. Useful for API design reviewers, backend developers, and teams building consumer-friendly error contracts.