A powerful Chrome extension for monitoring web page content changes and notifying users in real-time.

• 🔍 Support for full-page and partial content monitoring
• 📧 Email notifications for content changes
• 👥 User account system
• 💎 Membership tiers (Normal/Pro)
• 🌐 Multi-language support (English/Chinese)
• 📝 Task labels and notes
• 📊 Real-time task status display

web-content-monitor/
├── extension/
│   ├── popup/
│   │   ├── popup.html
│   │   ├── popup.css
│   │   └── popup.js
│   ├── icons/
│   │   └── icon.png
│   │   └── icon16.png
│   │   └── icon48.png
│   │   └── icon128.png
│   └── manifest.json
├── server/
│   ├── app.js
│   └── webpages.db
└── package.json
└── .env.example

• Frontend: HTML, CSS, JavaScript
• Backend: Node.js, Express
• Database: SQLite3
• Dependencies:
  • nodemailer (email delivery)
  • puppeteer (web content scraping)
  • cheerio (HTML parsing)
  • stripe (payment processing)
  • diff (content comparison)

# Clone the repository
git clone https://github.com/Scodive/ChangeDetection.git
cd ChangeDetection

# Install dependencies
npm install

# Install PM2
npm install -g pm2

# Start the service
pm2 start server/app.js --name "web-monitor"

# Configure startup
pm2 startup
pm2 save

The database will be created automatically on first run, including tables for:

• users (user information) id, email, password, created_date, membership_level
• monitoring_tasks (monitoring tasks) id, email, url, monitering_type, content, start_time, status, last_check_time, last_change_time, change_content, label, read_status

1. Copy .env.example to .env:

cp .env.example .env

2. Update the .env file with your actual values:

• SMTP credentials for email notifications
• Stripe API key for payment processing
• Server host and port
• Database path
• API base URL

1. Open Chrome extensions page (chrome://extensions/)
2. Enable Developer mode
3. Click "Load unpacked"
4. Select the extension directory from the project

• Full-page monitoring
• Monitor up to 2 web pages simultaneously
• Basic email notifications

• Full-page and partial content monitoring
• Unlimited monitored pages
• Custom monitoring intervals
• Priority email notifications

Main API endpoints:

POST /register     // User registration
POST /login       // User login
POST /start-monitoring    // Start monitoring task
POST /stop-monitoring     // Stop monitoring task
GET /tasks        // Get monitoring tasks
POST /upgrade     // Upgrade membership

1. Ensure server firewall allows access to port 3000
2. Configure SMTP service correctly for email notifications
3. Regularly backup the database file
4. Monitor PM2 logs for potential issues

• Node.js 14.x or higher
• Chrome browser version 88 or higher
• SQLite3
• PM2 (for production deployment)

# Install dependencies
npm install

# Start development server
npm run dev

# Run tests
npm test

# Build extension
npm run build

The application includes comprehensive error handling for:

• Network connectivity issues
• Database operations
• Email delivery failures
• Content scraping errors

• Password encryption
• Rate limiting
• CORS protection
• Input validation
• XSS prevention

MIT License

Contributions are welcome! Before submitting a Pull Request:

1. Ensure code follows project standards
2. Add necessary tests
3. Update relevant documentation

For support, please:

1. Check the documentation
2. Search existing issues
3. Create a new issue if needed

Future planned features:

• Mobile app support
• Advanced notification options
• API integration capabilities
• Enhanced analytics

Special thanks to all contributors and the open-source community.

For more information or support, please open an issue or contact the maintainers (hjiangbg@connect.ust.hk).