Supa KJB is a Ugandan music artist whose real name is Katama John Bosco, born on Saturday, 13th June 2003, in Busonga Village, Busonga Parish, Luuka District. He comes from a family of nine people and is the third-born, growing up with four girls and three boys. His father is Katama John Bosco, and his mother is Kilabira Norah.

Supa KJB began his education at Kiyunga Parents Primary School, later joined Immaculate Heart of Mary for his O-Level studies, and completed his A-Level education at Lwanda High School.

His passion for music started in Primary Five, and over the years, it grew into a serious career pursuit. In January 2026, Supa KJB officially began his professional music journey when he entered Woyo Records Studio. Although he had written several songs, he chose to record his debut single titled “Nkulowoza”, produced by Kash Beats. Supa KJB writes his own songs and is currently managed by Kiss Nation Management. As of now, “Nkulowoza” is his first official release and is available on all social media and digital streaming platforms.