Where should you place input validation in a layered LLD?

Problem Statement

Explanation

Validate payload structure and simple constraints at the boundary to fail fast. Enforce business invariants inside domain services to keep them centralized. This split avoids duplication and keeps core rules intact even when called from jobs or other services.

Code Solution

SolutionRead Only

if(!payload.email) return 400;
orderService.place(validatedCommand);

Practice Sets

This question appears in the following practice sets:

Low-Level Design (LLD) Interview Core

Next Question

Master Interviews
Anywhere, Anytime

Where should you place input validation in a layered LLD?

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

Where should you place input validation in a layered LLD?

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