Mastodawn

@cymplecy CyberChef is a great tool for this kind of thing, in general - https://gchq.github.io/CyberChef/#recipe=URL_Decode()

The Cyber Swiss Army Knife - a web app for encryption, encoding, compression and data analysis

How to URL encode (percent encode) a string in Vala (GLib):

Uri.escape_string ("Hello, world!");

// Hello%2C%20world%21

To decode:

Uri.unescape_string ("Hello%2C%20world%21");

// Hello, World!

(Documenting it as it was not easy to find with a cursory web search.)