Clean Architecture & Domain-Driven Design in React

Frontend applications are no longer simple presentation layers; they contain complex business rules, domain entities, offline sync strategies, and transaction workflows. Applying Clean Architecture and Domain-Driven Design (DDD) principles to React ensures that core business logic remains independent of UI frameworks, state libraries, and backend APIs.

In this lesson, you will learn how to decouple domain entities from React components using Dependency Inversion and the Ports & Adapters (Hexagonal) pattern.

Layered Architecture in Frontend

┌──────────────────────────────────────────────┐
│ 1. PRESENTATION LAYER (React Components)     │
│    JSX, Tailwind, User Interactions          │
├──────────────────────────────────────────────┤
│ 2. APPLICATION LAYER (Use Cases & Hooks)    │
│    Orchestrates business workflows           │
├──────────────────────────────────────────────┤
│ 3. DOMAIN LAYER (Pure Business Entities)     │
│    Pure TypeScript classes & validation rules│
├──────────────────────────────────────────────┤
│ 4. INFRASTRUCTURE LAYER (Adapters & APIs)   │
│    Fetch/Axios, LocalStorage, WebSockets     │
└──────────────────────────────────────────────┘

Best Practices

• Keep Domain Entities Pure: Core domain entities and validation rules should be pure TypeScript with zero React imports.
• Use Dependency Inversion: Application use cases should depend on abstract repository interfaces rather than concrete Axios clients.
• Test Use Cases in Isolation: Test application business logic directly without rendering React components.

Summary

Applying Clean Architecture and Domain-Driven Design to React codebases isolates core business rules from presentation and transport layers, resulting in resilient, testable enterprise systems.