YouTube Music Likes to Playlist

saveToPlaylist.js

// Define the sleep method and relevant paths.
function sleep(ms) {
  return new Promise((resolve) => setTimeout(resolve, ms));
}
const sleepTime = 600;
const count = 0;

// Update playlistName to desired playlist
const playlistName = "#####";

(async () => {
  // Capture the list of liked songs.
  const likedSongs = document
    .querySelector("#contents")
    .children.item(0)
    .children.item(0).children;

  // Loop over each item in the liked songs list.
  for (let song of likedSongs) {
    try {
      // Click the three-dot menu and give it a moment to appear.
      const threeDotMenu = song.children.item(5).children.item(1);
      threeDotMenu.click();
      await sleep(sleepTime);

      // Click "add to playlist" and give it a moment to process.
      const addToPlaylist = Array.from(
        document.querySelectorAll("a[id=navigation-endpoint]")
      ).find((element) => element.innerText === "Add to playlist");
      addToPlaylist.click();
      await sleep(sleepTime);

      // Select desired playlist.
      const playlist = document.querySelector(`[title="${playlistName}"]`);
      playlist.click();
      await sleep(sleepTime);
    } catch (e) {
      console.log(song.outerText);
    }

    // Debug; only process the first n songs.
    //         count += 1;
    //         if (count === 3) {
    //             break;
    //         }
  }
})();

Took forever (I should have tried to reduce the sleepTime) but worked like a charm. Thanks a lot ! Tried several but this is the one that worked !

Took forever (I should have tried to reduce the sleepTime) but worked like a charm. Thanks a lot ! Tried several but this is the one that worked !

Just saw your comment! Glad to hear it was helpful! And yes, it does take a while. Unfortunately this is super synchronous and browser based, so it depends on slow user actions.