• Ease of handling in the application
  • Errors have clear meanings, like ErrNoRows
  • -> Properly define custom errors
• Ease of handling for operators
  • Understand where and how the error occurred
  • Wrap the error and add a message, or use an external library that provides stack-trace errors
  • Values of arguments (personal information needs to be masked)
• Ease of handling for clients
  • 4xx and 5xx errors
  • Determine if retrying will resolve the issue, and whether the error is on the client or server side
    • -> Properly handle custom errors and convert them to HTTP responses in the API controller
  • Display messages that inform end users about what to do next