Describe a clean error-handling strategy for a service layer. How do you map domain failures to API responses?

Problem Statement

Explanation

Model failures explicitly as typed errors (e.g., ValidationError, NotFound, Conflict). Service methods return either a result or a failure. This keeps control flow readable and testable. At the boundary, map types to HTTP codes and include stable error codes for clients. Log with correlation id, avoid leaking internals, and keep messages user-friendly for recoverable cases.

Code Solution

SolutionRead Only

Result<T, E extends DomainError>  // map to 400/404/409/500 at controller

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Low-Level Design (LLD) Interview Core

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Describe a clean error-handling strategy for a service layer. How do you map domain failures to API responses?

Problem Statement

Explanation

Code Solution

Practice Sets

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Master Interviews Anywhere, Anytime

Describe a clean error-handling strategy for a service layer. How do you map domain failures to API responses?

Problem Statement

Explanation

Code Solution

Practice Sets

Related Questions

Which statement best describes the Single Responsibility Principle?

Open–Closed Principle encourages what practice when adding features?

High-Level Design (HLD) typically focuses on which artifacts?

Which UML diagram best captures interactions over time between components?

Which pairing describes a healthy design goal?

More from System Design

Master Interviews
Anywhere, Anytime