What is Deno? Deno is a new JavaScript runtime. It was built by Ryan Dahl, the creator of Node.js.  Dahl had a few things that he regretted doing with Node and wanted to build a runtime that could solve those issues. Deno, like Node, is built on the V8

freeCodeCamp is a nonprofit organization offering free online coding courses and programming tutorials, covering topics such as web development, data science, and machine learning. Learners can gain practical coding skills, build real-world projects, and earn certifications to advance their careers in tech.

freeCodeCamp

Deno is built on the V8 JavaScript engine but was built using Rust instead of C++. It aims to have the same APIs on the server that you would use in the browser. It uses TypeScript as a first class language out of the box, so you can run or use TypeScript without installing any other TypeScript.

Intro to Deno – Guide for Beginners

very nice intro to Deno. here are some key points:
created by same author as Node.js
uses TypeScript by default
via CLI, Deno scripts must be granted access to the network, file system, environment variables, etc.
built-in Fetch API
no package module - dependencies can be hosted via any URL (CDN, CMS, web server)
ES Modules (require syntax not supported)
built-in standard library with useful functionality
built-in support for unit testing

It fills me with joy to see the accelerating fragmentation of the JS world and hope it speeds up its demise greatly.