Niels Leenheer

@html5test.com

CTO of Salonhub. Creator of http://html5test.com, writes at http://nielsleenheer.com, team @FronteersConf, Google Developers Expert, Invite me to speak at your event.

Mood for this morning: The Skinner Brothers with the Rampage EP - perfect to drown out intrusive thoughts about the state of the world with a violent sonic mix of punk, ska and drum and bass.

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Okay… who knows a good alternative to Deno Deploy that isn’t Cloudflare. We use Cloudflare for one of our products and need something worker/deno-like on a completely separate infrastructure.

Whew, we're still reeling from Fronteers: Dark Mode this past friday! We brought developers from multiple countries together to celebrate front-end and human connection. It was super "gezellig"! Thank you everyone for helping us make this event happen, thank you for supporting Fronteers!

Arrived early in Dordrecht. Tomorrow Fronteers Dark Mode, but first I have an appointment at the regional archives for research. A lot is scanned and online, but today I’ll be handling actual notary acts from around 1600.

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And this is what I've been spending my evenings on lately. A decoder for receipt printer protocols. You can take the bytes that get send to a receipt printer and inspect the commands that are inside of it. And... actually see a render of the receipt. Only useful for a hand full of people. And me.

⏰ Last call for Fronteers Dark Mode 2026! Ticket sales close tomorrow, Saturday at midnight, and there are just 13 seats left. So if you’ve been thinking about joining us in Dordrecht next Friday, this really is your last chance. 🌑✨ 🎟️ www.fronteersconf.org We’d love to see you there! ❤️

Fronteers Dark Mode 2026, Friday, October 2, at Cinema De Witt in Dordrecht. An intimate evening of frontend talks and community from 3 PM until after midnight. Tickets €99 at fronteersconf.org. Collage showing Dordrecht, dinner, the Cinema De Witt venue and its red-seated screening room, with a QR code linking to the conference website.

For 15 years I've been obsessed with receipt printers and the protocols that they speak. I created an open-source encoder that can run in the browser can create receipts and send them to the printer. That turned into a whole project that is now used by dozens of products: point-of-sale.dev

A dozen receipt printers - only a fraction of my "lab"

I'm down one of the rabbit holes again. I *just* wanted to print receipts on a Star TSP100 printer. Initial problem: unlike other printers, it does not support text, only graphics. And my receipt printing library only supports rendering to text based ESC/POS and StarPRNT...

Over the years I have brought some really weird things through airport security. I’ve set off the alarms once - they closed down the lane and started shouting in panic because it looked really serious on the scanners. But never a vintage oscilloscope. Until today. Freiburg, here we come!

I didn’t think I’d ever agree with DHH, but he is totally right. Linux is infiltrated by absolute maniacs. Anyone still using any of DHH’s products should be taking a very close look at themselves.

aly@aly.codes · 2mo ago

re: omarchy trying to create parallel infra to subvert the linux community and kick trans/female/black people out i know some people think that sounds crazy but DHH literally is doing a podcast tour saying that is exactly what he's doing lol

Introduce yourself with 10 acts you’ve seen live: Marillion Fish Egdon Heath Focus Micheal Jackson Björk Massive Attack Portishead The Big Push Ren <- earlier today And so many more. I could fill the list with just Fish, saw him at least a twenty times.

Sara Joy ☠️@sjoy.lol · 2mo ago

Introduce yourself with 10 acts you've seen live: Less Than Jake Frank Turner Bob Dylan Hans Zimmer Reel Big Fish Lemon Jelly Metallica Green Day Public Service Broadcasting & many swing dance bands

WebMCP has been an interesting journey for me. Initially not seeing the point, even sceptical it should even be part of the web. Agents can use HTML, just like everybody else, right?