In this article you will learn about what is Deno? And how it is different from node.js. Lets first understand both of them.

 

What is Node.js?

Node.js is a open-source javascript runtime environment built on Chrome’s V8 javascript engine.

 

It is built with :

l C,

l C++

l javascript.

 

What is Deno?

A secure runtime for javascript and TypeScript built with V8, Rust, and Tokio.

 

It is built with :

l TypeScript— Deno supports both JavaScript and TypeScript out of the box.

l Rust— Deno’s core was written in Rust, Node’s in C++.

l Tokio— The event loop written in Rust.

 

So start with history of node.js.

 

History of Node.js :

l Node.js was written initially by Ryan Dahl in 2009.

l Npm was introduce in 2010. Npm is node package manager that whats node.js very power-full.

l Adoption rate of node.js sky rocketed. There are lots of website that user node.js and they have Billion of monthly users like twitter and aliexpress.

l In 2019, Node.js is one of the most popular server-side framework to use.

 

Now lets discuss history of deno.

 

History of Deno :

l Deno is written by creator of node.js Ryan Dahl.

l First commit was made in May 13, 2018.

l Still in experimental stage.

l +30k Stars on Github (in just 1 year).

 

Know lets see what feature’s Deno offers:

 

1. Security :

The most important feature that Deno’s offer is security. Deno by default executes the code in a sandbox, which means that there is no run time access to :

l File system

l Network

l Environmental variables

 

2. Module :

Deno load modules by URLs. By using URLs Deno packages can be distributed without a centralize registry no more package.json or node_module.

Mistakes in Node.js :

l You have access to all sort of system call.

l Package.json made Node.js depend on npm.

l Promises are necessary abstration for async/await.