Here are five lessons that completely changed how I structure React projects

1. Organize by Feature, Not by Type

A common mistake many developers make (including my past self) is splitting everything by type:

src/
  components/
  hooks/
  pages/
  utils/

That seems neat at first — until your app grows. Suddenly, you’re jumping across files and folders just to make one change.

A better way: group by feature. Keep everything related to a feature together — components, hooks, and API calls included.

src/
  features/
    auth/
      components/
      hooks/
      api/
    dashboard/
      components/
      hooks/
      api/

2. Create a shared/ Folder for Reusable Code

Some elements — buttons, modals, utility functions — are used everywhere. Put these in a shared/ folder to avoid duplication and keep your code DRY (Don’t Repeat Yourself).

src/
  shared/
    components/
    hooks/
    utils/

This helps maintain consistency across your app and reduces future headaches.

3. Naming Conventions Matter

Clear naming = clear thinking. Here’s what works well:

• Components → PascalCase → UserProfile.jsx
• Hooks & Utils → camelCase → useAuth.js, formatDate.js
• index.js → use only for re-exports

Small details like this make your project easier to navigate — especially for new contributors.

4. Think in Layers

Just like in backend development, frontend apps have layers too. Understanding them helps you keep your architecture clean and modular.

• UI Layer → Components
• State Layer → Context, Redux, or Zustand
• Data Layer → API calls (Axios, fetch, React Query)
• Utilities Layer → Helper functions

👉 Rule: Keep these layers decoupled.

5. A Scalable Project Structure Example

my-app/
│
├── public/
│   └── favicon.svg
│
├── src/
│   │
│   ├── app/                          # Application bootstrap & global config
│   │   ├── App.tsx
│   │   ├── main.tsx
│   │   │
│   │   ├── layouts/
│   │   │   ├── MainLayout.tsx
│   │   │   ├── AuthLayout.tsx
│   │   │   └── DashboardLayout.tsx
│   │   │
│   │   ├── providers/                # Global providers
│   │   │   ├── QueryProvider.tsx
│   │   │   ├── StoreProvider.tsx
│   │   │   ├── ThemeProvider.tsx
│   │   │   └── RouterProvider.tsx
│   │   │
│   │   ├── routes/                   # Centralized routing
│   │   │   ├── index.tsx
│   │   │   ├── ProtectedRoute.tsx
│   │   │   └── routeConfig.ts
│   │   │
│   │   └── store/                    # Global state config
│   │       ├── index.ts
│   │       ├── rootReducer.ts
│   │       └── middleware.ts
│   │
│   ├── shared/                       # Truly reusable across features
│   │   ├── components/               # Design system components
│   │   │   ├── Button/
│   │   │   │   ├── Button.tsx
│   │   │   │   └── index.ts
│   │   │   ├── Input/
│   │   │   ├── Table/
│   │   │   └── Modal/
│   │   │
│   │   ├── hooks/                    # Generic hooks
│   │   │   ├── useDebounce.ts
│   │   │   ├── useToggle.ts
│   │   │   └── useIntersection.ts
│   │   │
│   │   ├── utils/                    # Pure functions (NO React)
│   │   │   ├── date.ts
│   │   │   ├── validation.ts
│   │   │   └── formatCurrency.ts
│   │   │
│   │   ├── types/
│   │   │   └── common.ts
│   │   │
│   │   ├── constants/
│   │   │   └── index.ts
│   │   │
│   │   └── styles/                   # Global styling
│   │       ├── globals.css
│   │       └── variables.css
│   │
│   ├── features/                     # 🔥 Business features (CORE of system)
│   │
│   │   ├── auth/
│   │   │   ├── api/
│   │   │   │   └── authApi.ts
│   │   │   │
│   │   │   ├── model/
│   │   │   │   ├── authSlice.ts
│   │   │   │   ├── authSelectors.ts
│   │   │   │   └── authTypes.ts
│   │   │   │
│   │   │   ├── ui/
│   │   │   │   ├── LoginForm.tsx
│   │   │   │   └── AuthLayout.tsx
│   │   │   │
│   │   │   ├── hooks/
│   │   │   │   └── useAuth.ts
│   │   │   │
│   │   │   └── index.ts
│   │   │
│   │   ├── users/
│   │   │   ├── api/
│   │   │   ├── model/
│   │   │   ├── ui/
│   │   │   ├── hooks/
│   │   │   └── index.ts
│   │   │
│   │   └── dashboard/
│   │       ├── api/
│   │       ├── model/
│   │       ├── ui/
│   │       └── index.ts
│   │
│   ├── entities/                     # Domain entities (optional advanced layer)
│   │   ├── user/
│   │   │   ├── types.ts
│   │   │   └── mapper.ts
│   │   └── product/
│   │
│   ├── services/                     # Infrastructure layer
│   │   ├── http/
│   │   │   ├── httpClient.ts
│   │   │   ├── interceptors.ts
│   │   │   └── errorHandler.ts
│   │   │
│   │   ├── storage/
│   │   │   └── localStorage.ts
│   │   │
│   │   └── logger/
│   │       └── logger.ts
│   │
│   ├── lib/                          # Third-party wrappers
│   │   ├── react-query.ts
│   │   ├── dayjs.ts
│   │   └── sentry.ts
│   │
│   ├── config/                       # Runtime configs
│   │   ├── env.ts
│   │   ├── featureFlags.ts
│   │   └── permissions.ts
│   │
│   ├── tests/                        # Global test utilities
│   │   ├── setupTests.ts
│   │   ├── renderWithProviders.tsx
│   │   └── mockServer.ts
│   │
│   ├── e2e/                          # Playwright / Cypress tests
│   │   ├── auth.spec.ts
│   │   └── dashboard.spec.ts
│   │
│   └── index.d.ts                    # Global type declarations
│
├── .env
├── .env.development
├── .env.production
│
├── package.json
├── tsconfig.json
├── tsconfig.node.json
├── vite.config.ts
├── vitest.config.ts
├── playwright.config.ts
│
├── .eslintrc.cjs
├── .prettierrc
├── .editorconfig
├── .lintstagedrc
├── .gitignore
└── README.md

Simple, predictable, and scalable.

Example Aliases (Vite or Webpack)

// vite.config.js
resolve: {
  alias: {
    '@app': '/src/app',
    '@features': '/src/features',
    '@shared': '/src/shared',
    '@assets': '/src/assets',
  }
}