What is Deno? Deno vs Node An Absolute Guide 2021

deno vs node

What is Deno?

What is deno?

According to the official site deno.land, Deno is a simple, modern, and secure runtime for Javascript and TypeScript that uses V8 and is build in rust programming language. But wait Node.js does the same work right and surprisingly both these runtimes are developed by the same person, Ryan Dahl. The question is why does he felt the need for a new runtime after node js.

Well according to Ryan Dahl

“[node] could have been much nicer” — 10 Things I Regret About Node.js

This is the point where the term deno vs node comes into play and a question arises that will Deno replace node.js.


Node.js is currently being used by huge organizations and it also has a large community so how is this possible that this is the end of node.js. Let’s discuss some key points and differences between the two runtimes and figure out is it going to be the end of node.js.

deno code example


First of all, let us look at the installation process for both the runtimes, the packages, and the package manager they use.

Let’s just consider we are using Windows for comparison of both the runtimes.

If we talk about the installation of node.js, we have to download the node.js installer that has the npm (Node Package Manager) included as node js uses npm. Once node.js is installed on the computer when you run your program the npm downloads a huge node_modules folder.

On the other hand, if we talk about  Deno the installation is so simple that you just need to type this line of code on you Powershell

iwr https://deno.land/x/install/install.ps1 -useb | iex

And in addition to that, it doesn’t install any folder like node_modules and it does not have a centralized package manager, it is decentralized which is a plus point.

So if we talk about installation I pick Deno as a winner.


When we talk about the performance node.js is way slower and our new favorite runtime is much lightweight as there are no modules like node_modules and it is very fast (Check the benchmarks).



Typescript is a superset of JavaScript which primarily provides optional static typing, classes, and interfaces. It’s one of the biggest advantages is that it is used for spotting common errors as you type the code.

If we talk about Node.js if we want to integrate our code with typescript we have to type a lot of code.

Installing the typescript package

After this including it in the package.json file into the scripts and lots of other stuff. But luckily in the case of Deno, it is built on Typescript and it’s available as default.

So I think for this point in Deno vs node you know who is the clear winner.


Node.js has been around for about 11 years now and it has a large community of developers that means all the problems that a new programmer might face while working with node.js has already been faced and solved by the fellow developers, and suppose if someone faces a new problem there is a huge community that understands the core of the language and will be available to solve that issue.

But in the case of Deno, its stable version released on 13 May 2020 so it has a very small ecosystem, which means there are very few developers in the community and if a programmer faces any bug he won’t be able to fix it and as the ecosystem is very small he will face lots of problems solving those issues. Its ecosystem is growing 1% currently of node.

So in the case of the ecosystem node is the clear winner.



Stackoverflow is directly linked with the ecosystem, if we talk about node as it has a larger ecosystem lots of questions relating to the bugs faced by different programmers have already been asked there so there is a huge possibility that the problem you are facing has already been solved and you can copy-paste your problem from StackOverflow.

But in the case of deno as there is a very small ecosystem, so there will be very little code available on the StackOverflow for you to copy-paste, and if you are stuck who knows what will happen.

So in this one node.js is the winner

Secure Execution

If we talk about secure execution deno won’t let a program access disk, network, subprocesses, or environmental variables. once you got to allow any of thoseyou’ll opt-in with a command-line flag, which may be as granular as you wishfor instance –allow-read=/tmp or –allow-net=google.com. Another security improvement in Deno is that it always stops on uncaught errors, unlike Node.js, which can allow execution to proceed after an uncaught error, with results that will not be predictable.

So now that we have talked and have seen the many differences between node js and Deno and have seen what is Deno it’s time to think about what you have to pick for yourself from deno vs node.

Will Deno replace node?

So as I’m going to conclude this article I’m going to tell you guys that will Deno replace Node.js. The simple answer to this is No, not any time soon. What you can do with Node you’ll be able to it do with Deno. If you would like to create server-side code with Javascript or Typescript then both will do the job.

Node.js isn’t going anywhere, it’s hugely popular which isn’t getting to change overnight. While Deno does offer some improvements the developers will take a while to start out using it as default and there is no war such as deno vs node.

If you liked this article make sure to share it with your friends and in your community. If you are new to javascript and you want to learn in a very short period of time so you can start deno check this article Easiest way to learn JavaScript in 2020.