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📚 Library Management API\n\nA RESTful API built with **Express.js**, **TypeScript**, and **MongoDB** to manage books and borrow records efficiently.\n\n---\n\n## 🚀 Features\n\n- 📖 Create, Read, Update, Delete (CRUD) for books\n- 🔍 Filtering \u0026 Sorting (by genre, creation date)\n- 📦 Borrow book with quantity check \u0026 update\n- 📊 Borrow summary using MongoDB Aggregation\n- ✅ Validation with Mongoose Schema\n- ⚙️ Static methods \u0026 Middleware\n\n---\n\n## 📁 Folder Structure\n\n```\nsrc/\n├── app/\n│   ├── config/\n│   │   └── db.ts\n│   ├── controllers/\n│   │   ├── book.controller.ts\n│   │   └── borrow.controller.ts\n│   ├── models/\n│   │   ├── book.model.ts\n│   │   └── borrow.model.ts\n│   └── route/\n│       ├── book.route.ts\n│       └── borrow.route.ts\n├── index.ts\n├── server.ts\n.env\n.gitignore\npackage.json\ntsconfig.json\nREADME.md\n```\n\n---\n\n## 📦 Tech Stack\n\n- **Framework:** Express.js  \n- **Language:** TypeScript  \n- **Database:** MongoDB with Mongoose  \n- **Validation:** Mongoose Schema + Custom Middleware  \n- **Tooling:** ts-node-dev, dotenv\n\n---\n\n## 🔧 Getting Started\n\n### 1️⃣ Clone \u0026 Navigate\n\n```bash\ngit clone https://github.com/yourusername/library-api.git\ncd library-api\n```\n\n### 2️⃣ Install Dependencies\n\n```bash\nnpm install\n```\n\n### 3️⃣ Create `.env` File\n\n```env\nPORT=5000\nMONGODB_URI=mongodb+srv://username:password@cluster.mongodb.net/library\n```\n\n\u003e ⚠️ `.env` is already listed in `.gitignore`\n\n### 4️⃣ Run Development Server\n\n```bash\nnpm run dev\n```\n\n---\n\n## 📮 API Endpoints\n\n### ✅ Books\n\n| Method | Endpoint             | Description                  |\n|--------|----------------------|------------------------------|\n| POST   | `/api/books`         | Create a new book            |\n| GET    | `/api/books`         | Get all books (filterable)   |\n| GET    | `/api/books/:bookId` | Get a single book by ID      |\n| PUT    | `/api/books/:bookId` | Update book info             |\n| DELETE | `/api/books/:bookId` | Delete a book                |\n\n### ✅ Borrow\n\n| Method | Endpoint       | Description                            |\n|--------|----------------|----------------------------------------|\n| POST   | `/api/borrow`  | Borrow a book (with quantity update)   |\n| GET    | `/api/borrow`  | Get borrow summary using aggregation   |\n\n---\n\n## 📊 Aggregated Borrow Summary Example\n\n```json\n{\n  \"success\": true,\n  \"message\": \"Borrowed books summary retrieved successfully\",\n  \"data\": [\n    {\n      \"book\": {\n        \"title\": \"The Theory of Everything\",\n        \"isbn\": \"9780553380163\"\n      },\n      \"totalQuantity\": 5\n    }\n  ]\n}\n```\n\n---\n\n## 📽️ Video Explanation\n\n👉 [Click here to watch the video explanation](https://drive.google.com/file/d/1M2O0-yrA0_wgquwS95h24pL6w_Lvtyep/view?usp=drive_link)\n\n---\n\n## 🧑‍💻 Author\n\n- **Name:** Md Moinuddin Chowdhury \n- **Email:** moinchy7@gmail.com  \n- **GitHub:** [Moinuddin-dotcom](https://github.com/Moinuddin-dotcom)\n\n\n\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fmoinuddin-dotcom%2Fl2-a3","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fmoinuddin-dotcom%2Fl2-a3","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fmoinuddin-dotcom%2Fl2-a3/lists"}