Drag and drop SVG on the map and it returns GeoJSON back to you.
git clone https://github.com/mapbox/svg-to-geojson.git
cd svg-to-geojson
npm install
npm start
Runs the app from http://localhost:8080/svg-to-geojson/
Credit: https://github.com/spotify/coordinator/ for code to get started and inspiration!