Favorite tracks on Jellyfin from a list of tracks

favJellyfin.js

// 1. Navigate to: https://your.jellyfin.instance/web/index.html#!/search.html
// 2. Define `const tracks`, each track is an object with `title` and `artist`
// 3. Define `section_title` to match the section title for tracks
// 4. Call `await favItems(tracks);`

const section_title = 'Lieder';
const delay = 750;

async function favItems(items) {
	const success = [];
	const fail = [];

	for (const item of items) {
		await search(item);

		const favSuccessful = await favItem(item);
		if (favSuccessful) {
			console.debug(`${item.artist} – ${item.title} succeeded`);
			success.push(item);
		} else {
			console.debug(`${item.artist} – ${item.title} failed`);
			fail.push(item);
		}
	}
	return {
		fail: fail,
		success: success
	};
}
async function favItem(track) {
	// Find tracks-container
	const containers = [...document.querySelectorAll('.searchResults .verticalSection')].filter((container) => {
		return container.querySelector('.sectionTitle').textContent === section_title;
	});
	if (containers.length !== 1) {
		return false;
	}
	const container = containers[0];

	// Find track-card
	const cards = [...container.querySelectorAll('.card')].filter((card) => {
		const title = card.querySelector('.cardText-first').textContent;
		const artist = card.querySelector('.cardText-secondary').textContent;

		return normaliseTitle(track.title) === normaliseTitle(title) && (normaliseTitle(track.artist) === normaliseTitle(artist) || artist === 'Various Artists');
	});
	if (cards.length !== 1) {
		return false;
	}
	const card = cards[0];

	// Fav track
	const fav = card.querySelector('.favorite');
	if (!fav.matches('.ratingbutton-icon-withrating')) {
		fav.click();
		await (new Promise((resolve) => setTimeout(resolve, delay)));
	}
	return true;
}
function normaliseTitle(title) {
	return title.split(' feat. ')[0].replace(/ &/g, ',');
}
async function search(item) {
	const fields = document.querySelectorAll('.searchfields-txtSearch');
	const field = fields[fields.length - 1];
	field.value = item.title;

	field.dispatchEvent(new Event('input'));
	await (new Promise((resolve) => setTimeout(resolve, delay)));
}