Here's the updated README without the API endpoints section:

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Backend Repository - Express.js Application

🌟 Project Overview

This repository contains the backend code for a robust Express.js application designed for scalability and integration with modern technologies. It is organized to ensure modularity, maintainability, and ease of navigation. The application handles core business logic, data storage, external API integrations, and middleware for seamless user interactions.

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🚀 Features

• Framework: Built using Express.js, a fast and minimal web framework for Node.js.
• Database: Utilizes MongoDB for efficient and flexible data storage.
• System Design: Implements Object-Oriented System Design (OOSD) principles for modular, reusable, and easy-to-maintain code.
• Google API Integration: Integrates Google Calendar API for event management and scheduling.
• Middleware: Custom middleware for logging, authentication, error handling, and validation.
• RESTful API: Clean and robust APIs for frontend and third-party integration.
• Security: Secure authentication with JWT and error handling mechanisms.

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🛠️ Tech Stack

1. Node.js: JavaScript runtime for building scalable applications.
2. Express.js: Web framework for routing, middleware, and handling HTTP requests.
3. MongoDB: NoSQL database for storing data in a flexible, scalable manner.
4. Mongoose: ODM for MongoDB to simplify database operations.
5. Google APIs: Integration with Google Calendar API for scheduling and event management.
6. JWT (JSON Web Tokens): Secure user authentication and authorization.
7. Dotenv: Manages environment variables for secure configuration handling.

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📁 Project Structure

src/
├── common/              # Common services (e.g., logging, utilities)
│   └── services/        # Services shared across the app
├── constant/            # Constants and configuration files
├── Controller/          # Business logic for handling requests
├── Dao/                 # Data Access Objects for interacting with MongoDB
├── Db/                  # Database connection and management
├── Entities/            # Mongoose schema models and data structures
├── Error/               # Custom error classes and handlers
├── Middleware/          # Custom middleware (e.g., authentication, logging)
├── RouteHandler/        # Request handling logic for routes
├── Routes/              # API route definitions
├── Services/            # Service layer containing business logic
└── utils/               # Utility functions and helpers

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🖥️ Local Development Setup

Prerequisites

• Node.js (v14 or later)
• npm or yarn
• MongoDB (either local or cloud-based)
• Google Cloud Console credentials for API integration

Installation

1. Clone the Repository:

   git clone https://github.com/<your-username>/<repo-name>.git
   cd <repo-name>

2. Install Dependencies: Using npm:

   npm install

   Or using yarn:

   yarn install

3. Setup Environment Variables:

   • Create a .env file in the root directory.
   • Copy the contents of .env.example and update values for the following:
     • MongoDB URI
     • Google API credentials (client ID, client secret, etc.)

4. Start MongoDB: Ensure your MongoDB server is running locally or use a cloud-based MongoDB instance like MongoDB Atlas.

5. Run the Application:

   npm start

   Or for development mode with hot-reloading:

   npm run dev

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🛠️ Scripts

Command	Description
npm start	Starts the application in production mode
npm run dev	Starts the server with live reloading
npm run lint	Runs code linting with ESLint

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🛡️ Error Handling

The backend includes comprehensive error handling for various issues such as invalid user input, database connectivity problems, and unauthorized access. Errors are managed through a custom Error module, which standardizes error responses across the application.

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💡 Contributing

We welcome contributions! To get started:

1. Fork the repository.
2. Create a new branch: git checkout -b feature/your-feature-name.
3. Commit your changes: git commit -m 'Add new feature'.
4. Push to your branch: git push origin feature/your-feature-name.
5. Open a pull request with a description of the changes.

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📄 License

This project is licensed under the MIT License.

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💬 Feedback

If you encounter any issues or have suggestions for improvement, please feel free to open an issue or contact the project maintainer