brokle-error-handling

Error handling consistency in Go backends follows a three-layer pattern: Repository layers emit domain errors, Service layers convert them to AppErrors, and Handler layers map AppErrors to HTTP responses. This standardizes error propagation, reduces debugging time, and ensures predictable API reliability across your codebase.

Catch the domain error from the Repository layer, convert it using an AppError constructor like `appErrors.NewNotFoundError`, then let the Handler layer automatically map it to a 404 HTTP response. This enforces consistent status codes and error messages across all endpoints.

Domain aliases provide clean, unambiguous error imports and prevent naming collisions across your codebase. They make error types explicit and maintainable, improving code clarity and reducing confusion when multiple packages define similar error concepts.

Use centralized `response.Error` mapping at the Handler layer with zero logging, standardized error wrapping via `fmt.Errorf` and `errors.Is`, and AppError constructors from the Service layer. This ensures all endpoints return consistent HTTP statuses and error structures.

Yes. Context-wrapped domain errors preserve error context through the Repository → Service → Handler flow while maintaining proper error identity for `errors.Is` matching. This enables both rich debugging information and reliable error type checking.

Inconsistent error handling increases debugging time, causes unpredictable API responses, and breaks client error handling logic. Standardizing the Repository → Service → Handler flow with domain aliases and AppError constructors eliminates these issues and improves API reliability.