Introduction to Node.js

Node.js is an open-source and cross-platform library that is enabled when developing server-side web applications. Applications written using JavaScript in Node.js can run on many operating systems, including OS X, Microsoft Windows, Linux, and many others. Node.js provides a non-blocking I/O and an event-driven architecture designed to optimize an application's performance and scalability for real-time web applications. The biggest difference between PHP and Node.js is that PHP is a blocking language, where commands execute only after the previous command has completed, while Node.js is a non-blocking language, where commands execute in parallel, and callbacks are used to signal completion. Node.js can move files, payloads from services, and data asynchronously, without waiting for some command to complete, which improves performance.

Most JS frameworks that work with Node.js use the concept of routes to manage pages and other parts of the application. Each route...