Logging Best Practices Implement secure, structured logging with proper levels and context. Log Levels | Level | Use For | Production | |-------|---------|------------| | DEBUG | Detailed debugging | Off | | INFO | Normal operations | On | | WARN | Potential issues | On | | ERROR | Errors with recovery | On | | FATAL | Critical failures | On | Structured Logging (Winston) Request Context PII Sanitization Best Practices - Use structured JSON format - Include correlation IDs across services - Sanitize all PII before logging - Use async logging for performance - Implement log rotation - Never lo…