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Express.js is a fast, unopinionated, and minimalist web framework for Node.js, designed to build web applications and APIs. It is widely used due to its flexibility, simplicity, and scalability, making it ideal for projects ranging from small applications to large-scale services.

Features of Express.js:

• Lightweight and flexible framework for building both web applications and APIs.
• Supports a wide range of HTTP methods and robust middleware for request/response handling.
• Enables rapid prototyping and efficient development with minimal boilerplate code.
• Supports both synchronous and asynchronous code for better performance and scalability.
• Can be easily extended with plugins and middleware from the vast Node.js ecosystem.
• Integrates seamlessly with popular databases like MongoDB, MySQL, and PostgreSQL.

To test Express.js setup, run below commands on your VM:

1. Switch to root: sudo su
2. Navigate to hello world project directory: cd /opt/myproject
3. Start the application: node app.js
4. Open your browser and visit: http://your-server-ip:3000 to verify it's running.
5. To check the installed version of Express.js, run: npm list -g express

Disclaimer: Express.js is an open-source framework licensed under the MIT License. It is provided "as is" without any warranty. Users are responsible for ensuring proper security measures and best practices are implemented in their applications. Be sure to review licensing terms before deploying Express.js applications in production environments.