59 posts · 2015 → 2026 · one cell per month
Jon Kuperman
I work on the tools underneath the tools: JavaScript runtimes, compilers, source maps, and the people who build with them. Product at Bloomberg; before that, engineering at Cloudflare, Adobe, Brave, and Twitter.
Writing
All 59 →Published
& teaching
Frontend Masters
Mastering Chrome DevTools
workshop
Frontend Masters
Web Accessibility
workshop
Bloomberg JS Blog
Standardizing Source Maps
article
Cloudflare Blog
Get started building Web3 apps with Cloudflare
article
Cloudflare Blog
Automatically generating types for Workers
article
Cloudflare Blog
Build your next video application on Cloudflare
article
Projects
GitHub →
Infinite Sudoku
web
An endlessly replayable Sudoku with classic, killer, and auto-note modes.
Daily Inspiration
daily
One generated image a day, with its full prompt exposed.
- whoiz Who is actually serving this site? Fingerprints the CDN and host behind every path and draws it as a tree. cli
- LinguaBot Master Spanish through AI-powered interactive practice. ai
- Red vs Blue Build your army. Choose wisely. Survive. game
- source-map-validator Checks a source map's format, mappings, coverage, and semantics against the ECMA-426 spec. cli