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---
number: 822
title: Receipt Printer with JavaScript
date: 1726484400000
url: https://traffic.libsyn.com/syntax/Syntax_-_822.mp3
youtube_url: https://www.youtube.com/watch?v=tqZjSY-8N1E
---

Wes unveils his Hack-Week project —a thermal printer controlled by JavaScript that prints out Sentry.io errors in real-time. Scott and Wes dive into the nitty-gritty of how it works, from the ESC/POS protocol to tackling socket issues, and whether the project was worth the effort.

### Show Notes

* **[00:00](#t=00:00)** Welcome to Syntax!
* **[00:38](#t=00:38)** Brought to you by [Sentry.io](https://sentry.io/syntax).
* **[01:10](#t=01:10)** What is Hack Week?
* **[01:41](#t=01:41)** The project.
* [Follow the posts on X](https://twitter.com/wesbos/status/1827029875204489290).
* **[02:40](#t=02:40)** Why a receipt printer?
* **[03:55](#t=03:55)** How do these printers work?
* [ESC/POS](https://github.com/escpos).
* **[05:20](#t=05:20)** Communicating with the printer.
* **[07:24](#t=07:24)** ESC/POS Encoder.
* [ESC/POS Encoder](https://github.com/NielsLeenheer/EscPosEncoder).
* **[08:42](#t=08:42)** Socket issues.
* **[09:56](#t=09:56)** Using Transformers.js to stop 'toxic comments'.
* [Xenova's toxic-bert](https://huggingface.co/Xenova/toxic-bert).
* [Implementation in Wes' code](https://github.com/wesbos/thermal-printer/blob/main/lib/sfw.ts).
* **[10:48](#t=10:48)** Back to socket issues.
* **[12:18](#t=12:18)** Integrating with Sentry.
* **[15:01](#t=15:01)** Printing images with Playwright.
* **[16:17](#t=16:17)** Was it worth it?

### Hit us up on Socials!

Syntax: [X](https://twitter.com/syntaxfm) [Instagram](https://www.instagram.com/syntax_fm/) [Tiktok](https://www.tiktok.com/@syntaxfm) [LinkedIn](https://www.linkedin.com/company/96077407/admin/feed/posts/) [Threads](https://www.threads.net/@syntax_fm)

Wes: [X](https://twitter.com/wesbos) [Instagram](https://www.instagram.com/wesbos/) [Tiktok](https://www.tiktok.com/@wesbos) [LinkedIn](https://www.linkedin.com/in/wesbos/) [Threads](https://www.threads.net/@wesbos)

Scott: [X](https://twitter.com/stolinski) [Instagram](https://www.instagram.com/stolinski/) [Tiktok](https://www.tiktok.com/@stolinski) [LinkedIn](https://www.linkedin.com/in/stolinski/) [Threads](https://www.threads.net/@stolinski)

Randy: [X](https://twitter.com/randyrektor) [Instagram](https://www.instagram.com/randyrektor/) [YouTube](https://www.youtube.com/@randyrektor) [Threads](https://www.threads.net/@randyrektor)
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