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mern-app/ ├── client/ # Frontend (React) │ ├── public/ # Static assets (e.g., index.html, favicon) │ ├── src/ # React source code │ │ ├── assets/ # Images, fonts, etc. │ │ ├── components/ # Reusable UI components │ │ ├── pages/ # Page-level components │ │ ├── styles/ # Global or component-specific styles (CSS/SCSS) │ │ ├── utils/ # Utility functions (e.g., API calls, helpers) │ │ ├── contexts/ # React Context API for state management │ │ ├── hooks/ # Custom React hooks │ │ ├── redux/ # Redux store, slices, and actions (if using Redux) │ │ ├── App.jsx # Main App component │ │ ├── index.js # Entry point for React app │ │ └── ... # Other files (e.g., routes, constants) │ ├── package.json # Frontend dependencies │ └── ... # Other frontend config files (e.g., .env, .eslintrc) │ ├── server/ # Backend (Node.js + Express) │ ├── config/ # Configuration files (e.g., DB connection, env vars) │ ├── controllers/ # Route handlers (business logic) │ ├── models/ # MongoDB models (Mongoose schemas) │ ├── routes/ # API routes │ ├── middleware/ # Custom middleware (e.g., auth, error handling) │ ├── utils/ # Utility functions (e.g., email sending, logging) │ ├── services/ # Business logic (optional, for larger apps) │ ├── tests/ # Backend tests (e.g., unit, integration) │ ├── app.js # Express app setup │ ├── server.js # Entry point for the backend server │ ├── package.json # Backend dependencies │ └── ... # Other backend config files (e.g., .env, .eslintrc) │ ├── .gitignore # Git ignore file ├── README.md # Project documentation ├── package.json # Root-level dependencies (optional, for monorepo setup) └── ... # Other root-level files (e.g., Dockerfile, .env)