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Read: 06 - Node, Express, and APIs

What Is Node.js?

What is node .js this definetion from stack over flow sums it up nicely .Node.js is an event-based, non-blocking, asynchronous I/O runtime that uses Google’s V8 JavaScript engine and libuv library.

but , “event-based”, “non-blocking”, “asynchronous I/O” — that’s quite a lot to digest in one go. So let’s approach this from a different angle and begin by focusing on the other detail that both descriptions mention — the V8 JavaScript engine.

Node Is Built on Google Chrome’s V8 JavaScript Engine

Node.js® is a JavaScript runtime built on Chrome’s V8 JavaScript engine, and it is an event-based, non-blocking, asynchronous I/O runtime that uses Google’s V8 JavaScript engine and libuv library.

The V8 engine is the open-source JavaScript engine that runs in Google Chrome and other Chromium-based web browsers, including:
- Brave.
- Opera.
- Vivaldi. It was designed with performance in mind and is responsible for compiling JavaScript directly to native machine code that your computer can execute.

The V8 engine is the open-source JavaScript engine that runs in Google Chrome and other Chromium-based web browsers, including Brave, Opera, and Vivaldi. When we say that Node is built on the V8 engine, we don’t mean that Node programs are executed in a browser. Rather, the creator of Node took the V8 engine and enhanced it with various features, such as a file system API, an HTTP library, and a number of operating system–related utility methods.

Node.js Has Excellent Support for Modern JavaScript

What Is Node.js Used For?

installing (via npm) and running (via Node) various build tools — designed to automate the process of developing a modern JavaScript application.

The Node.js Execution Model

NodeExecutionModel

where to use Node.js ?

Node js is suited for building applications that require some form of real-time interaction or collaboration, (ex example chat sites) and apps such as CodeShare you can watch a document being edited live by someone else

Advantages Using of Node.js?

speed and scalability.
JavaScript is everywhere, and Node is a vast and expansive subject.
An often-touted advantage of using JavaScript on a web server is that your brain no longer needs to switch modes. You can do everything in the same language, which, as a developer, makes you more productive.
it speaks JSON. It is probably the most important data exchange format on the Web, and the lingua franca for interacting with object databases
JavaScript is ubiquitous: most of us are familiar with JavaScript, or have used it at some point.