After leaving WWE, Hennigan began wrestling on the independent circuit under his real name, as well as his previous ring name John Morrison. On his first post-WWE wrestling appearance, Hennigan rekindled an old feud facing off against Shelton Benjamin in the main event of the World Wrestling Fan Xperience (WWFX) Champions Showcase Tour in Manila, Philippines on February 4, 2012. Hennigan won the match to become the inaugural WWFX Heavyweight Champion. On August 12, 2012, Hennigan appeared at Juggalo Championship Wrestling's Bloodymania 6 event, defeating Matt Hardy and Breyer Wellington in a three-way match. On January 25, 2013, Morrison appeared at Dragon Gate USA's Open the Golden Gate, defeating Akira Tozawa in the main event of the show. Hennigan took part in the WrestleMania weekend, wrestling for the Pro Wrestling Syndicate. On April 4, Hennigan defeated Elijah Burke and on April 5, Morrison defeated Japanese legend Jushin Thunder Liger in an "International Dream Match" at a Pro Wrestling Syndicate (PWS) event. On April 19, Hennigan again defeated Sami Callihan in a no count-out, no disqualification falls count anywhere match at a 2CW event in Rome, New York. The next day, he defeated Kevin Steen at 2CW's first iPPV (Living on the Edge VIII), in Watertown, New York.  On June 21, 2013, Hennigan defeated Carlito Caribbean Cool in FWE Welcome to the Rumble II, winning the FWE Heavyweight Championship. The next day, Hennigan defended the title against Too Cold Scorpio at House of Hardcore 2. On September 6 and 8, Morrison wrestled against WWL World Heavyweight Champion Black Pain for the title, but he was defeated both times. On October 12, 2013, at FWE Grand Prix, Hennigan defeated Matt Morgan, retaining the FWE Heavyweight Championship. On March 11, 2015, Hennigan lost the FWE Heavyweight Championship to A.J. Styles. Morrison faced Rob Van Dam at Pro Wrestling Syndicate in Rahway, New Jersey on October 24, 2015 in a winning effort. After the match, Morrison shook hands with Van Dam and led the crowd in an "RVD" chant.  On June 28, 2016, it was announced that Hennigan would make his debut for Pro Wrestling Guerilla in the company's annual Battle of Los Angeles tournament. He won his match against Matt Sydal in the first round, but was eliminated by Ricochet in the quarter-finals.  On November 16, it was announced that Hennigan, under his Johnny Mundo ring name, would appear for What Culture Pro Wrestling on their Delete WCPW event on November 30. Mundo was scheduled to face Alberto El Patron, but due to Alberto's absence he was replaced by Gabriel Kidd. At the event, Mundo cut a heel promo, insulting Alberto El Patron and the crowd, before defeating Kidd. On January 28, 2017, Morrison won a tournament at a 5 Star Wrestling event for his 5 Star Wrestling Championship, defeating Moose, Drew Galloway, and Rey Mysterio to retain the title. On June 2, Hennigan defeated Rob Van Dam to become the Pacific Coast Wrestling Heavyweight Champion. On September 22, Morrison reunited with former MNM tag team partner Joey Mercury after ten years, defeating Reno Scum.

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