Hi there!

I love creating educational games for my kids, interesting Twitter bots and other creative stuff. Below you'll find a collection of some of my (more recent) JavaScript experiments. I love feedback, so feel free to drop me a line on Twitter if you liked them.

Have fun!


A new year, a new JavaScript framework! Using svelte I created this PWA to help my kids with math. Goal is to create an app-like experience:

  • 💃 micro animations
  • ⛺ full offline support
  • ⌛ prefetching JavaScript
  • 💻 server side rendering
Play + Source [2020]

Lumber Jack

Weekend project to learn more about Mobx State Tree. Simple kids game inspired by Stardew Valley and Monty Python. Don't forget to turn on sound!

  • 🌳 mobx state tree
  • 💃 react pose for animations
  • 🚀 create-react-app + TypeScript
  • 🎺 web audio for sounds

Play + Source [2019]

Multiple experiments

To play with the new React Hooks, CSS animations and UI's I did some experiments. The following websites were are result of this.

🕐 Klok + Source
🖌 Kids Draw + Source
📖 Write Only + Source


Size of NPM

I thought it might be (mildly) interesting to keep track of how the NPM node_modules folder grows over time. So I made this website that keeps track of the folder size of the top 100 npm packages. It's been running for a while now and the results are... frightening?

View + Source [2018]

Protest Against

Feel like protesting against some minor injustice? I created this (somewhat silly) web app using web sockets to make this as easy and fun as possible! Multiple users required, but you can also open more tabs.

Play + Source [2018]

Peter and the Wolf

Progressive Web App for kids, based upon the classical piece "Peter and the Wolf" by Prokofiev. Turns out that making large mp3s available offline is harder than I thought.

Play + Source [2018]

Finding Nora

I created this fun little PWA for my daughter Nora to help her spell her name. She loved it, hope you do too!

  • 🚀 create-react-app + TypeScript
  • ⛺ full offline support
  • 🎺 web audio for sounds
Play + Source [2018]

Star Wars or Star Trek?

Why not both? Using just CSS and a bit of JavaScript I recreated these classic science fiction intro's.

Star Trek + Source
Star Wars + Source [2017]

Term Search

A terminology search engine for translators. Currently only German-Dutch terms. Work in progress. [ No longer online ]

Technologies: NodeJS, Express, MongoDB, Loopback, ReactJS.

Source [2016]

Help Terence!

A Twitter bot raising emoji money for his trip around the world. Fun little experiment with social media and Twitter bots. [ No longer active ]

Technologies used: Express, MongoDB.

@helpTerence + Source [2016]

Word to Line Prices

A simple web app for translators that converts a price per word to a price per standard line (55 characters).

Visit the app + Source [2016]

Wikipedia edits by the Dutch government

Twitter bot inspired by @congressedits that monitors and Tweets any edits made to Wikipedia by the Dutch government.

@OverheidEdits + Source [2014]