822: Receipt Printer with JavaScript
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Wes Bos
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 Welcome to Syntax!
- 00:38 Brought to you by Sentry.io.
- 01:10 What is Hack Week?
- 01:41 The project. • Follow the posts on X.
- 02:40 Why a receipt printer?
- 03:55 How do these printers work? • ESC/POS.
- 05:20 Communicating with the printer.
- 07:24 ESC/POS Encoder.
- ESC/POS Encoder.
- 08:42 Socket issues.
- 09:56 Using Transformers.js to stop ‘toxic comments’. • Xenova’s toxic-bert.
- Implementation in Wes’ code.
- 10:48 Back to socket issues.
- 12:18 Integrating with Sentry.
- 15:01 Printing images with Playwright.
- 16:17 Was it worth it?
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