JJ Deveraux is a fictional character from the original NBC soap opera, Days of Our Lives. Born onscreen in 2004, the character was portrayed by several child actors between 2004 and 2006. In 2013, Casey Moss joined the cast as a rapidly aged JJ. JJ is the son of supercouple Jack Deveraux and Jennifer Horton and younger brother of Abigail Deveraux. The character is a member of the original core family, the Horton family as well as the Johnson family. JJ shares a connection to several of the show's most popular characters and is considered to be a legacy character. JJ's first significant storyline launched in 2013 focused on his rebellion following his father's death and his feud with his mother's new boyfriend, Dr. Daniel Jonas. In 2014, JJ's storyline shifts to him meeting Paige Larson (True O'Brien), JJ cheating on Paige with her mother, Eve Donovan, and Paige discovering their affair on her birthday in 2015. Further relationships have included Gabi Hernandez (Camila Banus) and Lani Price (Sal Stowers). In 2019, he began experiencing a romantic connection with Haley Chen (Thia Megia). Moss' performance has been met with critical acclaim, having garnered him a Daytime Emmy Award nomination for Outstanding Younger Actor in a Drama Series in 2018.