The Hidden Security Risk in API Error Responses

Error handling is often overlooked as an attack surface in API security, yet unfiltered error responses can expose critical system details like database schemas, file paths, and ORM versions to attackers. This guide demonstrates how to implement centralized, secure error handling using NestJS global exception filters to prevent sensitive information disclosure while maintaining adequate logging for debugging. Understanding OWASP API3 (Excessive Data Exposure) and applying proper error sanitization is essential for protecting production APIs from reconnaissance attacks.