Jack "J.J." Deveraux Jr. 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. 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.