What are permission sets in Deno 2.5?

Named permission groups in `deno.json` for run/test/compile—use `-P=name` to apply without flag spam.

Does Deno 2.5 replace Node.js?

No, but Node compat flags and test hooks make porting easier—still miles from full parity.

How do I install Deno 2.5?

`deno upgrade` if installed; else curl the shell script for macOS/Linux or PowerShell for Windows.

Deno 2.5: Config Permissions Finally Fix the Mess [Skeptical Take]

Deno's dropping 2.5 with permissions baked right into your config file—no more CLI flag roulette. But after 20 years watching runtimes promise security, I'm asking: does this actually stick the landing?

Dev Digest Apr 14, 2026 4 min read

Deno 2.5 terminal screenshot showing permission sets in deno.json config

⚡ Key Takeaways

Permissions now configurable in deno.json with named sets—huge for complex projects. 𝕏
Deno.test adds standard setup/teardown hooks, catching up to Jest/Mocha. 𝕏
WebSocket headers and bundle API are niche but powerful for deploy-heavy workflows. 𝕏