He is on the books of Sporting San Miguelito and wears shirt number 9. His main role on the pitch is Forward. He measures 193cm in height and weighs 78kg.

During the CONCACAF Central American Cup 2025 campaign, J. Cox made 8 appearances, scoring 1 goals and adding 1 assists. He averaged 0.1 goals per match from 6 shots, with 3 on target.