Everything You Should Know About Deno – Deno v/s Node.js

Everything You Should Know About Deno – Deno v/s Node.js

Deno vs Node.js is the latest topic for discussion since a new Deno version 1.0 got released and is now creating a buzz. Deno javascript is supported to fix all the inherent Node issues. Ryan Dahl- is a creator of both Node.Js and Deno. Though Node.js is a fast and reliable full-stack framework and is a great server with its ecosystem. Deno is a secure JavaScript that compiles JavaScript and TypeScript code simultaneously.

However, Ryan Dahl has also admitted that Node.Js development should have more security, modules, and dependencies, and both runtime and package managers should be in a single executable instead of the package-management program.

Deno and its main features

Deno is a secure JavaScript and TypeScript, based on the V8 JavaScript engine for JavaScript.

  • Deno’s core is written in Rust
  • Deno main – Tokio loop is written in Rust
  • Supports both JavaScript and TypeScript
  • V8 (Google’s JavaScript runtime used in Chrome and Node, among others)

 

Advantages of Deno

  • It’s a secure runtime environment by default.
  • Well designed module with security
  • It’s built on Rust (vs C++ for Node)
  • Built-in dependency controller and a code developer.

 

Security

Permissions system has been considered as a most touted improvement over Node.

NodeJs. – Node.js runtime is very lax with seamless access encompassing filesystem, computer’s network outgoing requests, environment variables, and more. There are the possibilities for third-party code to wreak havoc on your system if unchecked, which opens up several risks during the development or coding process.

Deno – While designing Deno, security module improvement was something Ryan Dahl was concerned and has specially set out to do, & to give access to any external permissions for the script, Deno provides command-line flag ‘–allow-net.’ And By default, all code is executed in a secure sandbox environment. This helps to prevent code from accessing things like the file system, environmental variables, networks unless access a grant with a command-line argument. Also, any file would not get deleted without your permission.

Third-Party Package Management

NodeJs: Node.js provides npm to manage all packages and has a vast and varied ecosystem of libraries and packages available. And that is the reason that the quality varies a lot and most of them are not actively maintained.

Deno: Deno allows you to install packages directly from URL, or straight can be used by importing packages as a library in the script from URL. It avoids the requirement for a package manager, by enabling scripts to import modules directly from any public URL. However, it makes it a bit difficult to import the data without knowing what’s out there. But it eliminates the ‘package.json ‘file for managing dependencies, as well as ‘node_modules ‘folder.

In Deno, a person does not have any requirement to have an own centralized repository, though it’s controversial, since importing modules from 3rd party sources increases vulnerability.

Deno’s standard library

Deno improves the developers’ experience by providing them with a standard library of helpers and utilities and allows developers to use official tools for primary functions and external libraries to fulfill complex tasks by ensuring high-quality, and dependable codes.

Modules

Since the Node.Js development, the standard for JavaScript modules remained the same as Common JS, supported by npm. Deno loads modules through URLs like other browsers, which makes many people confused when they first see it. Through by using URLs, Deno packages get easily distributed without a centralized registry such as npm, which recently has created a lot of problems. Importing code directly from URL makes it possible for package creators to host their code wherever they see fit. While starting up the application, Deno downloads all the imported modules and stores them and does not download the same one until it has been explicitly commanded.

Main comparisons between Node.JS and Deno

  • Deno doesn’t use npm and no package.json file for defining dependencies.
  • Nodejs was written in C++ while Deno’s core is written in Rust programming language.
  • Node was created in 2009, and after that, many new JS features have been introduced like Promise, Await, ES modules, Async, Await, etc., which are supported in Deno.
  • Deno supports Typescript and has an inbuilt Typescript compiler which is for a large application.
  • Typescript javascript eliminated developer error before the code execution.
  • Deno can get a break on unhandled exceptions, which is not possible in NodeJs.
  • Deno is more secure than Node Js as needs explicit permissions for the file, network, environment access.
  • ES6 import statements a decentralized approach as province management.
  • Deno is launched with several pre-loaded tools as Deno install, Deno info, Deno fetch, Deno code formatting, etc.

 

Below are a few built-in Deno’s tools for a better developer experience:

  • bundler: Have a specified script and its dependencies into a single file
  • Formatter: Can autoformat Javascript and Typescript
  • Dependency inspector: Run this on an ES module to list down all the dependencies
  • Test runner: Test your Javascript and Typescript code in conjunction in the standard library
  • debugger: Permits to debugging your Deno programs with Chrome, VS code, Devtools, and others.
  • Linter: Help to catch all potential issues in the program.

 

Can Deno Replace Node.JS?

Well, it would be too early to say about it. As per node.js web development companies, they both have their own advantages and disadvantages. Where Node.js has a robust and huge ecosystem, Deno is in its nascent stage and can take some time to catch up.

Verdict

Deno is raising as an exciting project that has been steadily growing for quite some time now. Node.js also has a long way to go. Where Deno, incorporates robust permissions system and first-class TypeScript support, Nodejs has an extensive and well-established ecosystem around it that’s been over a decade in the making.

Only the future will decide whether Deno will pick up or not, and once it matures, it may become a viable choice for building more substantial projects.