Frontend React Structure

Code and programming are not only about writing the best code. They are also about building for the long term scalability, architecture, maintainability, and making the code-base easy for the next engineer to understand and work with.

To achieve this, a project owner or senior developer must properly structure the code-base so it can be consistently followed by everyone on the team.

React Project Structure

Folder Structure

All application source files are stored inside the src/ directory:

src/
├── @types          # Global TypeScript types
├── api             # API service definitions
├── assets          # Images, icons, and static files
├── components/
│   └── common      # Reusable shared components
├── config          # Application configuration
├── constants       # Static values, enums, constants
├── hooks           # Custom React hooks
├── layout          # Layout and parent-level components
├── locales         # Localization / i18n files
├── modules         # Feature-based reusable components (Modal, Map, Chart, etc.)
├── pages           # Route-level pages
├── store           # Redux slices
├── styles          # Global styles and CSS files
├── utils           # Helper functions and utilities
├── validation      # Form validation schemas (Zod)
├── app             # Route management
├── main.tsx        # Application entry file
└── store.ts        # Redux store configuration

This structure promotes separation of concerns, scalability, and easy onboarding for new engineers.

App Configuration Overview

public/: Contains static assets such as images, fonts, and favicons.

package.json: Defines project dependencies, scripts, and metadata.

postcss.config.mjs: PostCSS configuration used by Tailwind CSS.

eslint.config.js: ESLint rules for maintaining code quality and consistency.

.env.example: Template file listing all required environment variables.

tsconfig.json: Base TypeScript configuration, extended by:

• tsconfig.app.json – App-specific configuration
• tsconfig.node.json – Node/Backend-related types

vite.config.ts: Vite configuration for bundling and optimizing the frontend application.

Microfrontend Structure

For large-scale applications, I use a monorepo-based microfrontend architecture with apps and packages.

Folder Structure

apps/
└── carrier        # Carrier dashboard application

Apps contain complete, deployable frontend services.
  
packages/
├── @repo/ui                  # Shared UI components & design system
├── @repo/utils               # Shared utility functions
├── @repo/eslint-config       # Centralized ESLint configuration
├── @repo/global-config       # Global project configurations
└── @repo/typescript-config   # Shared TypeScript configurations

Why This Structure?

This structure is designed with scalability, maintainability, and team collaboration in mind.

1. Clear Separation of Concerns

Each folder has a single responsibility:

• UI logic lives in components and modules
• Business logic lives in api, store, and utils
• App-level concerns live in config, app, and layout

This prevents files from becoming tightly coupled and hard to refactor.

2. Feature-Driven Development

Using modules and pages allows teams to:

• Develop features independently
• Scale without folder chaos
• Easily remove or refactor features

This is especially useful in large React apps and microfrontend architectures.

3. Easier Onboarding for New Engineers

A predictable structure means:

• New developers know where things live
• Less time searching, more time building
• Fewer architectural mistakes

A good folder structure is documentation by itself.

4. Built for Long-Term Scale

The same principles apply whether:

• You are working on a small React app
• Or a large monorepo with microfrontends

That’s why the transition from a single app → monorepo feels natural.

Final Thoughts

Folder structure is not about preference. it’s about discipline, consistency, and future-proofing.

As a project owner or senior developer, setting a strong structure early:

• Reduces technical debt
• Improves team velocity
• Makes the codebase enjoyable to work with