I was in the situation where had a bunch of SVGs, but they were stroke-based, from feather-icons.com.
I don’t trust the cross-browser rendering of SVG strokes. It leads to problems when trying to color the icons with CSS as well – so I needed the expanded versions. There are over 200 icons in the set. Expanding them manually took too much time so I looked around and found a script.
Convert SVG icons that are stroke-based to expanded shapes in Illustrator. Use the Scripts functionality to run this script.
It took about 10 minutes to expand everything but at least I didn’t have to do it manually 😅.
Original script found at Adobe Forums.