How Node JS Works?

Node.js is a popular open-source, cross-platform runtime environment built on the Chrome V8 JavaScript engine. It allows developers to write server-side code in JavaScript, using an event-driven, non-blocking I/O model that makes it highly efficient and scalable.

Here’s how Node.js works:

1. Event-Driven Architecture: Node.js uses an event-driven architecture, where certain types of events (such as user input, network requests, or file I/O) trigger corresponding callback functions that handle the event. This makes Node.js highly responsive and efficient, as it can handle many simultaneous events without blocking the execution of other code.
2. Non-Blocking I/O: Node.js uses non-blocking I/O to handle I/O operations, such as reading or writing data to a file or network socket. Instead of waiting for the operation to complete before moving on to the next task, Node.js allows other tasks to continue executing while the I/O operation is in progress. This makes it highly efficient and scalable, as it can handle many I/O operations simultaneously without slowing down.
3. Package Management: Node.js has a built-in package manager called npm (Node Package Manager) that allows developers to easily install, manage, and share reusable code packages (called “modules” or “packages”). This makes it easy to integrate third-party libraries and frameworks into Node.js projects, and also makes it easy to share code between developers.
4. Cross-Platform Support: Node.js is designed to be cross-platform, which means that it can run on a wide range of operating systems, including Windows, macOS, and Linux. This makes it highly versatile and flexible, as developers can write code once and run it on multiple platforms without modification.
5. Web Development: Node.js is commonly used for web development, as it can be used to build both server-side and client-side applications. It is often used in conjunction with popular web frameworks such as Express.js, which provide additional features and functionality for building web applications.