Deno

Deno at a glance

Deno is a modern, secure-by-default JavaScript and TypeScript runtime, an alternative to Node.js with built-in tooling. Deno ships frequent releases plus security fixes; as a runtime under applications and scripts, keeping it current matters.

For admins Deno's headline feature is its permission model — it runs code with no file, network or environment access unless explicitly granted, a real security advantage worth using (grant the narrowest permissions a program needs). Keep Deno current for security and compatibility fixes, and pin the version in projects, containers and CI for reproducibility. As a runtime, the application's requirements set the version; dependencies (fetched by URL or from the registry) carry supply-chain risk — pin and audit them. After updating, run the app and its tests, since Deno evolves quickly. Source it officially. Patchletter surfaces new Deno releases so security fixes land.