Have you ever wanted to remove duplicated songs from your Spotify library? Now you can find and remove them using Spotify Dedup.

This project uses the Spotify Web API for managing playlists. Just log in and it will traverse your playlists, finding songs that appear multiple times with the same identifier (Spotify URI) in a given playlist.

If it finds duplicates, they can be removed just pushing a button. And since it doesn't create a whole new playlist, it keeps all the information like creation date and subscribers.

You can check it out on https://spotify-dedup.com or run it locally.

Install the dependencies:

pnpm install

Run it:

pnpm dev

Then open http://localhost:3000 in a browser

In order to test saved tracks, create duplicated tracks by executing the Web API request on https://developer.spotify.com/console/put-current-user-saved-tracks/?ids=2JZfTvWWtpaE8NohqRXqFr,1poUtf2dDdVUtWL8tn03Wd,6ADSaE87h8Y3lccZlBJdXH,2x45xqISlmmDJqxOqr8BuS,1iQ1BpOGF1Umd3lpTV4OPO.

This app is a good example of how to traverse a user's library without incurring in rate limit. Have a look at the code and see how Promises and a Promise Queue are used to control the amount of requests sent to the Spotify Web API. If you are interested in throttling promises, check out promise-throttle.