Nostr notes by Niels Leenheer

And it is now the best ESC/POS and StarPRNT renderer there is. ...

2026-09-25T14:03:04Z

In reply to nevent1q…q2qe
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And it is now the best ESC/POS and StarPRNT renderer there is. Probably even better than some printers.

But it will probably be used by just me. Or at most a handful of people.

And that is fine. I love this project.

I generated receipts using a dozen different open-source encoders ...

2026-09-25T14:01:28Z

In reply to nevent1q…ta5c
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I generated receipts using a dozen different open-source encoders and test suites of other rendered and compared them manually with the output of dozens of printers. Painstakingly making sure to capture every single quirk and detail...

The result is a renderer that exactly matches a real printer. And ...

2026-09-25T13:59:37Z

In reply to nevent1q…wdfh
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The result is a renderer that exactly matches a real printer. And it does not just support the code my own projects generate…

And to render receipts, you need a bitmap font at specific sizes. ...

2026-09-25T13:56:40Z

In reply to nevent1q…fj4y
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And to render receipts, you need a bitmap font at specific sizes. And there wasn't yet one...

So I created a bitmap font editor... I know 🤪

But... what I really wanted is a renderer. For two reasons - some ...

2026-09-25T13:53:29Z

In reply to nevent1q…rr7p
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But... what I really wanted is a renderer. For two reasons - some printers only support bitmaps, and I wanted to be able to print on those too.

But I also wanted to have a preview to see how a receipt rendered.

From the moment I've been working on this - 15 years ago - ...

2026-09-25T13:51:15Z

In reply to nevent1q…85xh
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From the moment I've been working on this - 15 years ago - I've always wanted to build a decoder, so that I could inspect what we actually send to the printer... every single command that it receives.

And you end up with bytes. Just raw bytes that you send to the ...

2026-09-25T13:49:32Z

In reply to nevent1q…6gzr
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And you end up with bytes. Just raw bytes that you send to the printer - also with libraries that I created...

But let's rewind. You start with some JavaScript and my ...

2026-09-25T13:48:10Z

In reply to nevent1q…u6jt
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But let's rewind. You start with some JavaScript and my ReceiptPrinterEncoder library to create the actual receipt. From JavaScript, in the browser or a server. Or using Capacitor or Electron. I've build integrations for everything.

https://point-of-sale.dev

And this is what I've been spending my evenings on lately. A ...

2026-09-25T13:44:24Z

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.

RE: https://front-end.social/@heydon/117315437800953545 I've ...

2026-09-24T17:07:04Z

RE: https://front-end.social/@heydon/117315437800953545

I've seen Heydon's talk a week or two ago at [@smashingconf](https://mastodon.social/@smashingconf ) and it was amazing. I just loved it so much.

So if you want to see it... come down to Dordrecht in The Netherlands... A handful of tickets are still available.

https://www.fronteersconf.org

quoting
note1s0w…5j9h

Who is going to #fronteersConf (🦇 DARK MODE 🌚)? I have a feeling it will be pretty special. Tickets available here: https://www.fronteers.nl/en/conference/

Take a Joy-Con and connect it with WebHID, draw a picture in the ...

2026-04-05T10:22:29Z

Take a Joy-Con and connect it with WebHID, draw a picture in the air and capture it with the sensors. Create an SVG path and insert in the DOM. Apply CSS styling. Sample the DOM and use WebUSB to convert to ILDA and send it to a laser projector.

I created the worlds most complicated laserpointer…

Want to know how I created this? Check my blog post with an ...

2026-03-27T15:18:10Z

In reply to nevent1q…wtx3
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Want to know how I created this?

Check my blog post with an explanation of the math, the techniques I used and the problems I ran into.

https://nielsleenheer.com/articles/2026/css-is-doomed-rendering-doom-in-3d-with-css/

CSS is DOOMed! I've build DOOM in CSS and every wall, floor, ...

2026-03-27T15:16:48Z

CSS is DOOMed!

I've build DOOM in CSS and every wall, floor, barrel, and imp is a div, positioned in 3D space using CSS transforms.

https://cssdoom.wtf

Try it out! But... not every browser can handle it. This is taking the browser to its limit. Chrome has some issues. Safari too. Bugs will be filed.