There are 2 repositories under youtube-playlist-backup topic.
Simple application that allows to export information about the videos in YouTube playlist.
This is a python tool for exporting playlists from your YouTube account. It allows to import playlist data from CSV files and exports all playlists to a simple, browsable HTML web page.
yt-playlist-export is a tiny Python tool that allows to export private YouTube playlists, export YouTube's "Watch later" list and export YouTube "Liked videos".
A bookmarklet to export YouTube playlists as csv files.
Using YouTube's API, export your playlists in a TXT or CSV file.