Simon Willison’s Weblog

18th December 2021

TIL Safely outputting JSON — Carelessly including the output of `json.dumps()` in an HTML page can lead to an XSS hole, thanks to the following:

None

Posted 18th December 2021 at 1:06 am

Recent articles

Highlights from my conversation about agentic engineering on Lenny's Podcast - 2nd April 2026
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Vibe coding SwiftUI apps is a lot of fun - 27th March 2026

This is a beat by Simon Willison, posted on 18th December 2021.

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