You'll need to create a Spotify developer app to use this mod.
Why? In short, because it's easier for everyone. Since Spotify's API ratelimits are per app, not per user, if everyone has their own app, Hudify can poll the API much more frequently without worrying about hitting ratelimits. This allows Hudify to display far more accurate info, with much less risk of getting desynchronized.

Note: Playback controls are locked behind a Spotify Premium subscription, which is out of my control.
The CustomHud variables work fine without a subscription.

Installation instructions:

1. Create a Spotify app according to the "Create an App" section in Spotify's docs.
2. Set your app name and description to anything you want
3. Set your Redirect URI to http://localhost:8001/callback.
4. Get your Client ID from your newly created app
5. Put your Client ID in Hudify's config via ModMenu, or by manually editing .minecraft/config/hudify.json.
6. Press a Hudify keybind to initialize, and that's it!. No need to request an access token like the docs prompt you to, because Hudify takes care of that for you.

To uninstall, also be sure to also disconnect the app from https://www.spotify.com/us/account/apps

This process is very easy, only takes ~5 minutes, and does not cost any money nor require a Premium subscription. If you're still not interested, I suggest you try the mod Blockify, which doesn't require this process.

=if: sp_track=
{sp_track}
{sp_album}
{sp_artists}
{sp_progress} / {sp_duration}
{{sp_context_name, "Playing from {sp_context_name} ({sp_context_type})"}}

Shuffle: {sp_shuffle}
Repeat: {sp_repeat}

{{sp_message, "{sp_msg} {sp_msg_dur}"}}
=endif=