What’s Deno js? Is it the end of Node.js? What’s the difference b/w Deno and Nodejs? [2020]

Deno and Nodejs

What’s Deno js? Is it the end of Node.js? What’s the difference b/w Deno and Nodejs?

Deno.js is released its 1.0.0. release date on May 13th, 2020. All the details related to Denojs pros, cons, comparisonyou will find all down below. Is Deno will overpower the NodeJs let’s find out.

  • Ryan Dahl, creator of Node.js, has spent the last year and a half working on Deno, a new runtime for JavaScript that is supposed to fix all the inherent problems of Node.
  • Don’t get me wrong, Node is a great server-side JavaScript runtime in its own right, mostly due to its vast ecosystem and the usage of JavaScript. However, Dahl admits there are a few things he should have thought about more — security, modules, and dependencies, to name a few.
  • In his defense, it’s not like he could envision how much the platform would grow in such a short period of time. Also, back in 2009, JavaScript was still this weird little language that everyone made fun of, and many of its features weren’t there yet.

Let’s first know What Deno is? What are its main features?

Deno is a secure TypeScript runtime built on V8, the Google runtime engine for JavaScript.

  • Deno was created by Ryan Dahl, the creator of Node.js.
  • Deno is secure by default. Without permission, it cannot access files, network, or the environment.
  • Deno has TypeScript built-in with no external configuration needed.
  • External packages are pulled in via urls (much like Go)
  • Deno is an anagram for Node and it’s pronounced Deeno (long e).
  • Deno is its minimalistic design associated with its very efficient referentialy-transparent import-system.

Node.js design shortcomings ?

According to Dahl, who after all did design both Node.js and Deno, Node.js suffers from three major design issues:

  • a poorly designed module system, with centralized distribution;
  • lots of legacy APIs that must be supported;
  • and a lack of security.

What is Deno.js & is it time to move on Deno over Node.js? by html hints


Deno fixes all three problems.

In 2018 Ryan Dahl did a talk at JSConf EU where he talked about his top 10 regrets with Node.js. His talk was excellent and you can watch it below.

Security Points

Among the most important of Deno’s features is its focus on security.

As opposed to Node, Deno by default executes the code in a sandbox, which means that runtime has no access to:

  • The file system
  • The network
  • Execution of other scripts
  • The environment variables

In his talk, Ryan mentioned he had concerns with the node_module system and other legacy API’s that will never change. He noted that JavaScript has changed a lot since Node.js came out and that he could see a way to make a better version of Node.js. He wanted it to be compatible with the browser AND the server environment. Security was also something that he wanted to focus on.

There is a little history behind that choice of model for the library. Dahl wrote his prototype of Deno primarily in the Go language, but discovered potential conflicts between the garbage collectors in Go and V8. He and his collaborators then rewrote Deno proper with V8, Rust, and the Rust asynchronous I/O package Tokio. They implemented the Deno standard library in TypeScript.

What are some alternatives to Deno and Node.Js?

  • Modernizr
    It’s a set of superfast tests or detects as we like to call them which run as your web web page loads, then you may use the results to tailor the revel into the user. It tells you what HTML, CSS, and JavaScript feature the user’s browser has to offer.
  • Modernizr
    It’s a set of superfast assessments or detects as we like to call them which runs as your web page loads, then you can use the effects to tailor the experience to the user. It tells you what HTML, CSS, and JavaScript feature the user’s browser has to offer.
  • Fancybox
    It is a tool that offers a pleasant and elegant way to add zooming functionality for images, html content and multi-media to your webpages. It is constructed on the top of the popular JavaScript framework jQuery and is both clean to enforce and a snap to customize.
  • Lodash
    A JavaScript software library handing over consistency, modularity, performance, & extras. It presents application functions for commonplace programming tasks the usage of the useful programming paradigm.
    A javascript date library for parsing, validating, manipulating, and formatting dates.

But what else is new?

We’re not just talking about a new JavaScript runtime fully compatible with the current Node.js, instead, Ryan took the opportunity to cook some things into Deno that he considered were missing from his earlier creation.

Will Denojs supports NPM?

JavaScript has improved its standard library since the first versions of Node, but it still has quite a way to go compared to other languages. Deno also tried to improve that and claims to have a very complete standard library allowing developers to use official tools to perform basic tasks and only requiring the use of external libraries (ala NPM) for complex tasks.

So how is Deno handling dependencies? So far, by simply allowing you to require modules from anywhere. In other words, you can simply do:

import * as log from "https://deno.land/std/log/mod.ts";

No need to have your own centralized repository anymore, but you do have to be careful with this practice, since importing modules from 3rd party sources you don’t have control over, leaves you open and exposed.

So, will it replace Node.js anytime soon?

Not really, to be honest, the title is a bit of a clickbait. Some of us started using Node.js back in the day when it was around version 0.10, and we were using it in production! It was a bit scary to tell you the truth, but we were doing it because there was nothing like it around. Neither PHP, Python or even Ruby (let alone Java or .NET) could compare to having JavaScript and an asynchronous I/O model in the back-end, all in one. And over all these years, Node (and JavaScript) has evolved to meet the industry’s requirements. Is it perfect? Heck no! But like anything else in life, there is no perfect when it comes to programming languages.

Deno is no different, simply because right now, it’s just the culmination of around 2 years of work on an idea. It hasn’t been tried and tested in production systems yet. It hasn’t been reviewed and put into weird and unintended use cases to see how it deals with those border situations. And until it does, it’ll just be a toy for early adopters to play with. Maybe in a year, we’ll start hearing from companies sharing their experiences with it, how they’ve solved the newly found shortcomings, and eventually, the community behind it will adapt it to a point where it is useful. Will it replace Node then? Who knows! We’ll have to wait and see.

Let’s first go through some points which state that there may be low chance that Deno replace Node.js

  • Forces everyone to use TypeScript
  • Preaches security when that’s not an issue if you know what code is in your project (which you absolutely should)
  • Still uses the same V8 C++ engine (but with Rust as middleman
  • Still does not offer any portable builds (requires Deno installed on the target OS to even run a single line)
  • STILL DOES NOT OFFER PORTABLE BUILDS so you have to carry around all your dependencies and source code with you wherever you want to actually run the code.
  • Did a poor job of trying to copy what Go/Golang does for its import system
  • Has a wide open import system that doesn’t enforce version control (doesn’t enforce using Git repos like Go/Golang does)
  • Doesn’t offer much performance improvement from NodeJS TypeScript (their press release admits their TS compilation times are slow).
  • Supports about 50% less requests per second via its HTTP server (though response times per request are much better)
  • Doesn’t really offer anything new over NodeJS that your project manager cares about

All that said, if your backend NodeJS project is using TypeScript, I could see people justifying moving over to “the new thing”. The problem is, I can’t for the life of me see what you would gain that a project manager would really care about.

These days, apps are ran in Docker containers with full permissions since it’s containerized so security seems like a dumb thing to preach. If Deno came out with a way to absorb npm packages without issue, the migration process would be far less painful but mainly fruitless nonetheless.

Bottom line, I don’t know how you’d pitch your non-technical manager on the benefits of Deno because it doesn’t offer any transformative features or benefits. I see it gaining in popularity, yes. However, I do not see it replacing NodeJS and npm.


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