Folder Structure

/root
│
├── /backend             # Backend (Node.js + Express) files
│   ├── /config          # Configurations (DB connections, etc.)
│   │   └── db.js
│   ├── /controllers     # Request handlers for APIs (business logic)
│   │   └── userController.js
│   │   └── productController.js
│   ├── /middleware      # Custom middleware (authentication, error handling)
│   │   └── authMiddleware.js
│   ├── /models          # MongoDB schemas and models
│   │   └── User.js
│   │   └── Product.js
│   ├── /routes          # Express routes for APIs
│   │   └── userRoutes.js
│   │   └── productRoutes.js
│   ├── /utils           # Utility functions (e.g., token generation)
│   │   └── generateToken.js
│   ├── server.js        # Entry point for the backend (sets up Express)
│   └── package.json     # Dependencies for the backend (express, mongoose, etc.)
│
├── /frontend            # Frontend (React.js) files
│   ├── /public          # Public assets (images, favicon, etc.)
│   ├── /src             # Core source files for React
│   │   ├── /components  # Reusable components (buttons, forms, etc.)
│   │   │   └── Header.js
│   │   │   └── Footer.js
│   │   ├── /pages       # Pages that map to routes (Home, Profile, etc.)
│   │   │   └── HomePage.js
│   │   │   └── ProfilePage.js
│   │   ├── /context     # Context API (global state management)
│   │   │   └── AuthContext.js
│   │   ├── /services    # Services for making API calls
│   │   │   └── userService.js
│   │   │   └── productService.js
│   │   ├── /hooks       # Custom hooks (useAuth, etc.)
│   │   │   └── useAuth.js
│   │   ├── /App.js      # Main React component
│   │   └── index.js     # Entry point for React
│   └── package.json     # Dependencies for the frontend (react, axios, etc.)
│
├── /tests               # Unit/Integration tests
│   ├── /backend         # Tests for backend services (Mocha, Chai, etc.)
│   └── /frontend        # Tests for frontend components (Jest, React Testing Library)
│
├── .env                 # Environment variables (API keys, DB credentials)
├── .gitignore           # Files to ignore in version control (node_modules, .env, etc.)
└── README.md            # Project documentation