Obsidian Janet is a plugin for Obsidian that lets you run Janet code blocks.
The main usecase for this plugin is scripting in the context of your vault documents.
You'll need to have Janet installed for janet codeblocks.
You need to set absolute paths for janet in the plugin settings before evaluating code blocks.
You can find these paths using the where command in the terminal.
If you come from a Lisp background but are not familiar with Janet, keep in mind that Janet has differences from Lisp. Take a look at the Janet docs to learn more about what's available.