Leo Kettmeir

Leo Kettmeir

I am a software engineer at Deno who works on developer experience, implementing web APIs, improving auto-generated documentation, and more. When I am not programming, I tinker with 3D printers & fly drones.
The Latest From Deno
JSNation 2026JSNation 2026
Upcoming
The Latest From Deno
Deno has quietly evolved into far more than a simple server-side runtime. With built-in TypeScript, OpenTelemetry integration, ngrok-like network tunnelling, and deep Node.js compatibility, it's already a powerhouse; but we've been working on something bigger. In this talk, I'll introduce Deno Desktop: a brand new capability that completely changes what you can build with Deno and a single 'deno compile' command. If you've ever wished the JS runtime could meet you where your users actually are, you won't want to miss this one.
The Latest From Deno
Web Engineering Summit 2026Web Engineering Summit 2026
Upcoming
The Latest From Deno
Deno has quietly evolved into far more than a simple server-side runtime. With built-in TypeScript, OpenTelemetry integration, ngrok-like network tunnelling, and deep Node.js compatibility, it's already a powerhouse; but we've been working on something bigger. In this talk, I'll introduce Deno Desktop: a brand new capability that completely changes what you can build with Deno and a single 'deno compile' command. If you've ever wished the JS runtime could meet you where your users actually are, you won't want to miss this one.
JSR: Building an Open Registry for the JavaScript Community
JSNation 2025JSNation 2025
29 min
JSR: Building an Open Registry for the JavaScript Community
JSR is a community-driven, modern JavaScript registry with a mission to improve the ecosystem through transparency, openness, and innovation. Hear about recent developments, including the establishment of its governance board, ongoing projects and initiatives, and how these efforts directly benefit JavaScript developers. Discover how the community can engage directly, contribute to JSR’s direction, and get insights into the project’s goals and upcoming milestones. 
JSR – Next Generation JavaScript Registry
JSNation 2024JSNation 2024
6 min
JSR – Next Generation JavaScript Registry
JSR, a modern package registry for JavaScript and TypeScript, is designed to be fast, simple, reliable, and work across many JavaScript runtimes. Come learn how using JSR can simplify your developer experience.