Deno.js vs Node.js all the differences you need to know

Deno.js vs Node.js all the differences you need to know

The world of web development is very vast. In this Blog, we will look at two of the most popular JavaScript runtimes, Deno.js and Node.js, and compare the differences between using Deno.js vs Node.js table. While both technologies serve the same purpose, enabling developers to write JavaScript code for the server side, they differ in many ways. From security to scalability, let’s review each platform’s pros and cons and decide which is better for your needs.

Node.js is a platform built on Chrome’s JavaScript runtime to handle network requests and I/O communication with other machines. At the same time, Deno.js is an open-source framework for building web applications with Node.js and MongoDB in mind. Dino.js is as similar as possible to Express, Connect, Koa, Handerra, etc., from the backend’s point of view. The only difference is that Deno takes care of all dependencies, which makes working with legacy software easier than ever!

What is Deno.js?

Deno.js builds JavaScript desktop apps. It wraps nodes and supports Windows, Mac, Linux, and ChromeOS. Deno.js supports ES Modules, so you can write your app in ECMAScript 6+ and still use NodeJS’s features.

Deno also supports Native Web Apps (NWA), which are similar to Native Desktop Apps but written in HTML5 instead of C++ etc… HTML5 files are handled by deno-native or webpack-web app, depending on the device.

For Example:

console.log("hello, world! via Deno.js");
Code language: JSON / JSON with Comments (json)


Output of Deno js program

What exactly is Node.js?

Node.JS is a JavaScript environment for programming on the server side. It builds itself on Chrome’s V8 JavaScript engine, which means it can run all your script code faster than ever. Node uses an event-driven architecture capable of asynchronous I/O (asynchronous program execution). This means you can do so immediately instead of waiting until the entire application has loaded before you start interacting with it.

Node also has features like HTTP support and server modules that make it easy to make fast, scalable applications.

For Example:

console.log("hello, world! via Node.js");
Code language: JavaScript (javascript)


Output Of Node.js Program

Deno.js vs Node.js

Deno.js is a runtime for building JavaScript apps.Node.js is a runtime for building server-side apps.
Deno.js uses V8.Node.js uses V8’s embeddable engine, WebKit, or Chromium.
Deno.js is an open-source javascript framework that provides quick and reliable solutions for the development of web applications. It is an amalgamation of two different technologies.It uses an event-driven, non-blocking I/O model and is small and fast. This makes it perfect for data-intensive, real-time applications that run on many devices.
Deno.js is a powerful tool for creating single-page apps with real-time data without having to write any backend code!Node.js uses an event loop to execute scripts asynchronously.
It does this using WebSockets and SocketIO, which allow your web app to immediately update when new data comes in from your API’s response—no more polling or refreshing required!It can handle how users interact with the app or work in the background by using modules to implement business logic without reloading this code every time a browser (or mobile device) requests.

Pros and cons of Deno.js


  • Deno.js is free and open source, which means you can use it for free and doesn’t have any license fees to pay. 
  • It’s also fully compatible with JavaScript, HTML5, and CSS3. This means it can work on many different browsers and devices (including mobile devices), so your website will look good in any browser.


The biggest problem with Deno.js is that it only has one development environment. This means that many developers will need help debugging and using the tools for development.

Pros and cons of Node.js


  • Node.js is a JavaScript runtime that runs in the browser and is fast, secure, lightweight, and efficient. Node.js has been designed from the ground up to be quick and secure and is utilized by major corporations such as Google, Dropbox, and Yahoo! 
  • Additionally, js has a thriving community of highly active developers on Stack Overflow, so you can always ask questions there if you get stuck. 
  • The Node ecosystem is experiencing significant growth as more companies adopt Node to build real-time applications on the web.


  • First, more support for other languages and platforms must be needed.
  • Node.js has no native database support and does not have an object-oriented programming language, so your code must be written in JavaScript. 
  • Developers who use Objective-C or Java may find Node challenging because of the need for more support for these languages.
  • Slow response time, low popularity, and fewer standard developers prefer it over other similar languages like PHP.

Application of Node.js and Deno.js

In general, Node.js and Deno are both runtime environments for running JavaScript and TypeScript code on the server side. However, some critical differences between the two may make one a better choice for your application.

Node.js uses the CommonJS module system, which is widely supported and well-established but can be cumbersome. Deno uses the ECMAScript module system, which is more modern and concise but less widely supported.

When to use each runtime depends on your application’s needs and limitations. If you need a runtime that is easy to use and allows you to get started quickly, Node.js may be a good choice. Deno may be a better choice if you need a more secure runtime that is more difficult to attack. Deno is also a good choice if you are working on a project using TypeScript because it is designed to support TypeScript natively.


Node.js is one of the backend development community’s most popular and powerful frameworks. At the same time, Deno.js is a general-purpose web application framework focusing on fast execution, easy development, and high productivity. The Javascript is the same, while the implementation is not.

Deno.js and Node.js share some similarities, but they also have some significant differences. As we have seen in this Deno.js vs Node.js review, the benefits both offer are vast in different ways: whether high-production use or speed, you are sure to find something you will like about both. The choice is ultimately yours as to which one you want to give a try.

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