Index: Of Joker 2012 New
If you want to watch the Joker content available from the 2012 era, you do not need to risk the "index of" dark web. Here are the legitimate sources for what you are likely seeking:
This is the most likely match for your search. In 2012, Warner Bros released Batman: The Dark Knight Returns, Part 1. While the main villain is Two-Face and the Mutant Leader, the Joker appears in a terrifying, silent Hannibal Lecter-style cameo. Part 2 (2013) features the full Joker vs. Carrie Kelley Robin fight. This is a "new" (2012) Joker, and it is brilliant. index of joker 2012 new
This set included the "Joker's Favor" and "The Man Who Killed Batman" in pristine quality. If you want an "index" of Joker episodes from that era, search for the digital copy included with that Blu-ray set (purchasable on Vudu/FAH). If you want to watch the Joker content