Backs up saved tracks and playlists to a JSON file and can restore them. Uses non-deprecated APIs. Bulks add/request data so to not trigger 429 rate limit errors. Persist session upon reload.
cp public/config.sample.js public/config.js
npm iSign up and create an app here https://developer.spotify.com/. Put http://127.0.0.1:8080/callback as redirect URI. Save the Client ID to the /public/config.js file.
Add the users' emails that will use the app in the User Management tab of the Spotify app.
npm startBrowse http://127.0.0.1:36177/
The non-deprecated Spotify APIs are very poorly done and don't support ordering, thus saved tracks will be scrambled.
Need Spotify premium and cannot support more than 5 users: https://developer.spotify.com/documentation/web-api/concepts/quota-modes
