Bun is an all-in-one toolkit for JavaScript and TypeScript apps. It ships as a single executable. At its core is the Bun runtime, a fast JavaScript runtime designed as a drop-in replacement for Node.js. It is a fast, all-in-one toolkit for running, building, testing, and debugging JavaScript and TypeScript, from a single file to a full-stack application.
Bun is considered to be 5x faster than NodeJS. It has inbuilt support for reading .env files, Node monitoring, Http fetch, Web sockets. Bun transpiler can run <code>.js</code>, <code>.ts</code>, <code>.cjs</code>, <code>.mjs</code>, <code>.jsx</code>, and <code>.tsx</code> files.&nbsp; It supports both CommonJS to ES modules.
Bun is built using Apple's <a href="https://webkit.org/" target="_blank" rel="noopener">WebKit</a> engine. WebKit is the engine that powers Safari and is used by billions of devices every day. It's fast, efficient, and has been battle-tested for decades.
Bun is orders of magnitude faster than npm, yarn, and pnpm. It uses a global module cache to avoid redundant downloads from the npm registry and uses the fastest system calls available on each operating system.
You can run Bun with --hot to enable hot reloading, which reloads your application when files change.
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Bun is incredibly fast JavaScript runtime, bundler, test runner, and package manager – all in one 

Bun - Fast JavaScript runtime designed as a drop-in replacement for Node.js

A secure runtime for JavaScript and TypeScript built with V8, Rust, and Tokio. Deno aims to provide a productive and secure scripting environment for the modern programmer. It is built on top of V8, Rust, and TypeScript.
 
<ul>
<li>Secure by default. No file, network, or environment access, unless explicitly
enabled.</li>
<li>Supports TypeScript out of the box.</li>
<li>Ships only a single executable file.</li>
<li>Built-in utilities like a dependency inspector (deno info) and a code
formatter (deno fmt).</li>
<li>Set of reviewed standard modules that are guaranteed to work with
<a href="https://deno.land/std/" rel="nofollow">Deno</a>.</li>
</ul>

 A secure runtime for JavaScript and TypeScript built with V8, Rust, and Tokio. Deno aims to provide a productive and secure scripting environment for the modern programmer. It is built on top of V8, Rust, and TypeScript.

deno - A secure JavaScript/TypeScript runtime built with V8, Rust, and Tokio

µWebSockets.js is an HTTP/WebSocket server for Node.js that runs 8.5x that of Fastify and at least 10x that of Socket.IO. It comes with both router and pub/sub support and is suited for extraordinary performance needs. Being written in native code directly targeting the Linux kernel makes it way faster than any JavaScript implementation. It powers many of the biggest crypto exchanges in the world, handling trade volumes of multiple billions of USD every day.


uWebSockets.js - μWebSockets for Node.js back-ends

Napa.js is a multi-threaded JavaScript runtime built on V8, which was originally designed to develop highly iterative services with non-compromised performance in Bing. As it evolves, we find it useful to complement Node.js in CPU-bound tasks, with the capability of executing JavaScript in multiple V8 isolates and communicating between them. Napa.js is exposed as a Node.js module, while it can also be embedded in a host process without Node.js dependency.

Napa.js - A multi-threaded JavaScript runtime

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Bun - Fast JavaScript runtime designed as a drop-in replacement for Node.js

deno - A secure JavaScript/TypeScript runtime built with V8, Rust, and Tokio

uWebSockets.js - μWebSockets for Node.js back-ends

Napa.js - A multi-threaded JavaScript runtime

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Bun - Fast JavaScript runtime designed as a drop-in replacement for Node.js

deno - A secure JavaScript/TypeScript runtime built with V8, Rust, and Tokio

uWebSockets.js - μWebSockets for Node.js back-ends

Napa.js - A multi-threaded JavaScript runtime

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