📚 Library Management System (Backend)

A RESTful backend application built using Node.js, Express.js, MongoDB, and Mongoose following the MVC Architecture. The system provides secure user authentication, role-based authorization, complete book management, borrowing and returning functionality, borrowing history, search features, and automatic book availability management.

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🚀 Features

🔐 Authentication & Authorization

• User Registration
• User Login
• Password Hashing using bcryptjs
• JWT Authentication
• Role-Based Authorization (Admin/User)

📚 Book Management

• Add Book (Admin)
• Update Book (Admin)
• Delete Book (Admin)
• View All Books
• View Single Book
• Search Books by Title, Author, or Category
• View Available Books
• View Unavailable Books

📖 Library Management

• Borrow Book
• Return Book
• View Borrow History
• Prevent Duplicate Borrowing
• Automatically Update Available Copies

✅ Validation & Error Handling

• Required Field Validation
• Duplicate Email Validation
• Duplicate ISBN Validation
• Proper Error Handling
• Appropriate HTTP Status Codes

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🛠️ Technologies Used

• Node.js
• Express.js
• MongoDB
• Mongoose
• JWT (JSON Web Token)
• bcryptjs
• dotenv
• Thunder Client

---

📂 Project Structure

Library-Management-System/
│
├── config/
│   └── db.js
│
├── controllers/
│   ├── authController.js
│   └── bookController.js
│
├── middleware/
│   ├── authMiddleware.js
│   └── adminMiddleware.js
│
├── models/
│   ├── User.js
│   └── Book.js
│
├── routes/
│   ├── authRoute.js
│   └── bookRoute.js
│
├── .env
├── .gitignore
├── package.json
├── package-lock.json
├── server.js
└── README.md

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⚙️ Installation

1. Clone the Repository

git clone <repository-url>

2. Navigate to the Project Folder

cd Library-Management-System

3. Install Dependencies

npm install

4. Configure Environment Variables

Create a .env file in the project root.

PORT=5000
MONGO_URI=your_mongodb_connection_string
JWT_SECRET=your_secret_key

5. Start the Development Server

npm run dev

Server will start at:

http://localhost:5000

---

📌 API Endpoints

Authentication

Method	Endpoint	Description
POST	/api/auth/register	Register a new user
POST	/api/auth/login	Login user

---

Books

Method	Endpoint	Description
POST	/api/book/add	Add Book (Admin)
GET	/api/book/getall	Get All Books
GET	/api/book/get/:id	Get Single Book
PUT	/api/book/update/:id	Update Book (Admin)
DELETE	/api/book/delete/:id	Delete Book (Admin)
GET	/api/book/search?keyword=value	Search Books
GET	/api/book/available	Get Available Books
GET	/api/book/unavailable	Get Unavailable Books
POST	/api/book/:id/borrow	Borrow Book
POST	/api/book/:id/return	Return Book
GET	/api/book/getmybooks	View Borrow History

---

🔐 Authentication

Protected routes require a valid JWT token.

Authorization: Bearer <your_jwt_token>

---

📖 Book Schema

{
  "title": "The Alchemist",
  "author": "Paulo Coelho",
  "category": "Fiction",
  "isbn": "9780061122415",
  "totalCopies": 10,
  "availableCopies": 10
}

---

👤 User Schema

{
  "username": "sana",
  "email": "sana@example.com",
  "password": "********",
  "role": "user",
  "borrowedBooks": [
    {
      "book": "Book ID",
      "borrowDate": "2026-07-17",
      "dueDate": "2026-07-24",
      "returned": false
    }
  ]
}

---

📊 HTTP Status Codes

Status Code	Description
200	Success
201	Created
400	Bad Request
401	Unauthorized
403	Forbidden
404	Not Found
500	Internal Server Error

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🧪 API Testing

All API endpoints were tested using Thunder Client.

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🔮 Future Enhancements

• Pagination
• Sorting and Filtering
• Dashboard Statistics
• Fine Management
• Due Date Notifications
• Email Notifications
• React Frontend
• Project Deployment

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👩‍💻 Author

Sana Kolhapure

Backend Developer | Node.js | Express.js | MongoDB | REST APIs

This version is cleaner, follows common GitHub README formatting, fixes grammar, and looks more professional for recruiters and portfolio reviewers.