Kyle Simpson

You Don't Know JS. I wrote a book series explaining how JavaScript really works.

Monio. I built a toolkit that makes complex JavaScript code cleaner and easier to follow.

Foi. I wrote a programming language that makes functional code more straightforward to read.

WebAuthn Local Client. I built browser tools for fingerprint and face-based login.

Local Data Lock. I built encryption for apps that keeps your data locked with your fingerprint.

Local Vault. I made encrypted storage on your device protected by your fingerprint.

Proper Arrows. I made a checker that catches arrow function mistakes in your code.

Functional-Light JavaScript. I wrote a free book teaching practical functional programming for JavaScript developers.

QR Data Sync. I built a tool that moves data between devices using animated QR codes.

Passkey Garden. I built an interactive guide to passkey security and user experience.

YouPeriod. I made a private period tracker that never leaves your device.

Periodic Speller. I built a tool that spells words using chemical element symbols.

CAF. I wrote a tool that lets you cancel asynchronous JavaScript tasks cleanly.

Call Guard. I wrote a rule checker that prevents optional-call syntax from entering your JavaScript project.

TNG Hooks. I built state management hooks that work in regular JavaScript functions.

FP Workshop. I made workshop exercises that teach functional programming step by step.

Revocable Queue. I built a queue where you can cancel items before they're processed.

Chess Diagonals. I built a workshop that teaches algorithmic thinking through a chessboard problem.

Fasy. I made a toolbox for processing lists that handles waiting and timing.

Knight's Dialer. I built a workshop exploring how to count paths on a phone keypad efficiently.

Wordy Unscrambler. I built a workshop project that unscrambles letters into real words and compares algorithm performance.

Moduloze. I built a tool that converts code to work in browsers and servers.

FPO. I wrote a JavaScript toolkit that makes functions easier to use by letting you name your parameters.

MyCC. I built a tool to view your own saved credit card details.

Dwordly. I made a word game where you shrink words down to single letters.

WeatheRound. I built a demo weather app to show how modern websites work.

Import Remap. I built a tool that rewrites import statements to work across different environments.

AsyncGate. I wrote a tool that waits for multiple jobs to complete together.

Normalize Selector. I built a tool that standardizes CSS selectors into one clean format.

ES Feature Tests. I built a tool that tests what JavaScript features each browser supports.

Remote CSP Channel. I built a tool that makes remote messaging work like local messaging.

NYC Bug Demo. I made a test case that exposes a bug in how NYC handles function names.

Let-er. I built a tool that converts modern JavaScript block syntax into code that runs everywhere.

Grips. I wrote a templating engine that does one thing well and stops there.

FoilScript. I made JavaScript with the weird parts fixed.

Stable Timers. I wrote timers that actually work reliably.

Proper Ternary. I wrote a tool that flags messy conditional expressions in code.

Concrete. I defined a standard format for preserving JavaScript comments and whitespace.

FeatureTests. I built a service that tests which JavaScript features work in different browsers.

Cloud Sweeper. I made a web game that runs smoothly on any device with no extra libraries.

Unsuck The Web. I built templates and tools for making websites that actually work well.

Emdash. I made a blogging system that runs entirely on GitHub.

Tic-Tac-Toe Workshop. I made a workshop for building tic-tac-toe as a playable game.

JSON Minify. I built a tool that strips comments and whitespace from JSON files.

Edge First. I wrote a guide about building websites that run near your users.

HD Camera Fix. I made a browser extension that fixes squished video on Zoom and Google Meet.

Break The Web Forward. I made a website for an international day about improving the web.

DeePool. I built a fast object recycler that cuts memory waste in JavaScript.

Shortie. I built a proof of concept for running website code entirely on the server.

Rawnpm. I built a tool that creates shareable links to files buried inside npm packages.