Library Management System (minimal scaffold)

Structure:

• server/ - Express API + MongoDB (mongoose)
• client/ - static pages, scripts, and CSS

Quick start:

1. Ensure MongoDB is running locally (default mongodb://localhost:27017) or update MONGODB_URI in server/.env.

2. Open a terminal in server/ and run:

npm install
npm start

3. Open http://localhost:3000 in your browser.

Notes:

• This scaffold uses MongoDB with mongoose for data persistence.
• Authentication uses JWT. Set JWT_SECRET in server/.env for production.
• Replace with a hosted DB (e.g., MongoDB Atlas) and production auth flow when deploying.
• On first run with an empty database, seed creates demo users and 15 sample books.

Security features:

• Password hashing with bcrypt.
• JWT authentication with protected routes.
• Role-based access control for librarian-only endpoints.
• Input validation and sanitization middleware for auth/books/transactions.
• Duplicate book prevention by ISBN or title+author.
• Centralized not-found and error handling middleware.

Email setup (SMTP):

• Copy server/.env.example to server/.env and fill SMTP fields.
• Required keys: SMTP_HOST, SMTP_PORT, SMTP_USER, SMTP_PASS, EMAIL_FROM.
• For Gmail, use an App Password (not your normal account password).
• Borrow and return actions trigger email notifications.

Demo users:

• Admin (librarian): admin / admin123
• Student: student1 / password123
• Student: student2 / password456