Node.js Beginner’s Guide: Modules

A free and open-source framework called Node.js allows you to create scalable, quick network applications. It is lightweight and efficient thanks to its event-driven, non-blocking I/O approach, making it ideal for real-time, data-intensive applications that utilize dispersed devices.

One of the fascinating technologies available for JavaScript coding is Node.js.

This is due to the powerful runtime environment’s ability to let you use the language to create the backend of websites. Therefore, the fact that one out of every two developers uses Node is not surprising.

What is Node.js?

JavaScript scripting has also entered server-side development thanks to Node.js. In the days before Node.js, JavaScript mainly was used for the front end and user interaction.

But now that Node.js is available, it is feasible to create everything from simple CLI (command line) utilities to intricate programs and independent HTTP servers. Node.js is so brilliant for Node js development services because of its general applicability.

The JavaScript code is performed on the visitor’s computer, or client side when a website is accessed. Contrarily, while using Node.js, JavaScript is run server-side, or on the requesting server. This is the most noticeable distinction and initially seems unremarkable.

Callbacks That Are Asynchronous In Node.js

As you can see from the preceding example, asynchronous callbacks are the norm when using Node.js. In essence, you are directing it to perform a task, and when it is finished, your function will be called (callback). Node is single-threaded, which explains why. Instead of blocking until the request is finished while you wait for the callback to trigger, Node can continue working on other things.

For web servers, this is extremely crucial. Accessing databases is a fairly widespread practice in contemporary online applications. Node.js can handle other requests while you wait for the database to respond to your query. Rather than starting a new thread for every connection, this enables you to manage thousands of connections simultaneously with very little overhead.

Loop Node Event

The next query that you can have is, “How do we verify a request?” How can we tell when something is taking place? How do we make that promise in our code?

The event loop is a feature of Node’s language. You don’t need to call a start function before calling Node to begin a loop that is waiting for events. The end of that callback won’t ever come if you are creating an http server because you will always be waiting for an http request to come in, which means your program won’t shut down until you tell it to. You literally just put in your script, and the loop starts the moment Node starts and it doesn’t end until the last callback is called.

d2 Node.js Beginner's Guide: Modules

Node.js Modules

Modules are sections of code in Node.js that, depending on their useful feature, link with an external application. A single file or a group of files and directories can make up a module. Programmers typically utilize modules because of their reusability and capacity to divide complex sections of code into manageable chunks.

Basic Modules

The Node.js framework is quite simple. The necessary elements are equipped with the bare minimum of functionality. These crucial modules are loaded as the process begins and are included in the Node.js binary distribution. Nevertheless, in order to use the core module in your application, you must first import it. For example, the website can perform operations like unpublishing material, sending an email, or banning a user through the Actions UI module.

Domestic Modules

In a Node.js application, local modules are created locally. The numerous features of the application are divided up into these modules’ own files and directories. Moreover, it might be packaged and made accessible to the Node.js community via NPM.

External Modules

With the Node Package Management website, these modules can be downloaded (NPM). These modules can be installed in the project folder locally or globally. Some of the most popular third-party modules are React, Angular, Mongoose, and Express.


From a commercial standpoint, it is easy to understand why Node.js is such a game-changer. When JavaScript was initially developed, it could only be used in browsers. Engineers knowledgeable in both backend and JavaScript were needed by businesses. To address this issue, Node.js was developed. It connects front-end and back-end technology.

Moreover, Node is quick, scalable, and platform-neutral. Because of its single-threaded nature, users can use JavaScript (also single-threaded). While its event loop offers a workaround for carrying out longer I/O operations.