That failed for most of my playlists and favorites.
However, it's also possible to get some playlists from your browsers local cache:
https://www.dropbox.com/s/h9ubz6l2uedt6mc/Screenshot%202015-...
Thank you, that worked great as it had majority of my library saved in JSON format.
Yeah, looks like it keeps track of songs added to your collection in JSON format under the key "library<some big number>". Thanks for the heads-up.
As incontrovertibly illegal and probably unethical as this website was, I'm going to miss it. It was a great way to discover new music and I've become a fan of many artists that I found through it. There really is nothing like throwing a bunch of songs in the queue and saying "give me more music like this" using its radio service.
Likewise, I was able to get most of my library from the "library" key
WONDERFUL
It didn't have all of my playlists, but I was able to at least recover a small portion of my songs. Some is better than none...
If you act quick, you can access some of your playlist data by logging in here: http://groovebackup.com/