subsonic-playlist-dl.js

const hrefs = [...document.querySelectorAll('.albumThumb a[href*="playlist.view?id="]')].map((e) => e.href);
let lastPlaylistId = -1;
hrefs.forEach((e) => {
    const id = parseInt(new URL(e)?.searchParams?.get('id'));
    if (id > lastPlaylistId) {
        lastPlaylistId = id;
    }
});
for (let i = 1; i <= lastPlaylistId; i++) {
    let index = i;
    let error = false;
    try {
        await fetch(`http://192.168.0.16:4040/exportPlaylist.view?id=${index}`).then(e => error = e.status >= 400)
    } catch(e) {}
    if (!error) {
        setTimeout(() => window.location = `exportPlaylist.view?id=${i}`, index * 100);
    }
}