How can i find extensions for a runtime?

Feb 11, 2026
K
#1

so, i am building a flatpak, i wanna use node and rust extensions for the GNOME runtime but don’t know where these extensions are documented or how can i get a searchable list of extensions

C
#2

So, since the GNOME runtime builds upon the Freedesktop one, it uses its SDK extension for this purpose.

All Freedesktop SDK extensions follow the id schema org.freedesktop.Sdk.Extension.EXTENSION_NAME.

For a basic list of all extensions, you can use Flatpaks search:

$ flatpak search org.freedesktop.Sdk.extension

Most, if not all, of the extension manifests are in the Flathub repository. Some of them have a ReadMe with additional information, but not all.

Here is a link listing all SDK extension repositories:

For Rust and Node specifically:
The Rust extension is org.freedesktop.Sdk.Extension.rust-stable. For Node, there are different extensions for different Node versions, for example org.freedesktop.Sdk.Extension.node24 and org.freedesktop.Sdk.Extension.node22.