Bun in 100 Seconds

Bun.JS, a megaast JavaScript runtime and

tool chain that was built by someone who

woke up one day, looked at their node

modules folder, and chose violence. The

JavaScript programming language was

originally designed in 1995 for

front-end scripting in web browsers,

mostly to annoy people with pop-up

windows and targeted ads. But one

fateful day in 2009, it escaped the

browser, got a back-end job, and evolved

into the most cursed tool chain in

software history with a basic stack

including Node.js JS as a runtime, mpm

as a package manager, Webpack for a

bundler, just for testing, Babel for

transpiling, and a graveyard of config

files nobody understands. Then in 2021,

Bun came along and said, "What if the

runtime could do everything and do

everything faster?" The JavaScript world

agreed and now Bun powers tools like

Claude Code, serverless functions on

cloud platforms, and the local dev

environments for millions of soy devs.

At its core, Bun is a JavaScript runtime

like Noode.js, JS, but with an extreme

focus on performance, which they

achieved by swapping out C++ for Zigg

and Chrome's V8 engine for JavaScript

Core, the same engine used by Safari.

Starting from scratch has allowed it to

throw up some impressive Trust Me Bro

benchmarks. But it's more than just a

runtime. It replaces your bundler, so

you can write TypeScript and JavaScript

without any config nightmares. It

replaces your testing frameworks and

package managers, and it even has

built-in database drivers to work with

SQL, Reddus, and S3 buckets in the

cloud. And it does all of this from a

single binary while maintaining

compatibility with the Node.js ecosystem

is so instead of assembling a tool

chain, you just run bun and move on with

your life. To get started, we can

install it using a single command, then

open up the terminal and run bun init to

start a new project. And that gives us a

TypeScript file where we can start

writing some code. Then to run it, we

can run bun run and we can auto restart

on changes with the watch flag. No need

to mess with a transpiler or extra

dependencies. But now we want to build a

web app. And instead of installing

ExpressJS, we just use the built-in bun

HTTP module to create a basic web

server. That was easy, but now we want

to store some data in SQLite. You simply

import the database module and start

writing queries. Over the next few days,

our app goes viral with millions of

users. The database gets bogged down.

So, let's implement an in-memory cache

with Reddus. Like before, just import

the Reddus module and we're up and

running without any thirdparty

dependencies. But wait a minute, I still

love all these packages I have in this

package. JSON file. Well, instead of

running npm install, I can run bun

install to install them 25 times faster.

And we can even run executables on npm

with the bunks command. And finally, we

might as well test our code, which we

can do with the built-in test runner,

but which like everything else in Bun is

extremely fast. This has been Bun in 100

seconds. If you want to see more videos

like this, let me know what you want to

learn about next in the comments. Thanks

for watching, and I will see you in the

next one.