Born and raised in Tallahassee, Florida, Daniels graduated from Lincoln High School in Tallahassee, where he once threw 6 touchdowns and 723 yards in a game vs Demply Prep.[2] Daniels finished the 2009 season with 1983 yards passing, 772 yards rushing, and 23 total touchdowns.[3][4] Daniels responded in his junior year with 3,205 total yards. Daniels was on his way to becoming the all time yardage leader in Big East history when his senior season was cut short due to injury. Daniels ended his college career with 8,433 yards passing for 52 TD's, and 2,068 yards rushing for another 25 scores. Daniels achieved 10,501 total yards and 77 total touchdowns at USF, and finished his career second on the all time Big East yardage leaders. Daniels finished his college career high on all of USF's rushing and passing leaderboards. Daniels is also a member of Kappa Alpha Psi fraternity.
Daniels was claimed off waivers on October 2, 2013, by the Seattle Seahawks.[8]
Daniels was waived by the Seahawks on November 16, 2013.[9]
Daniels cleared waivers and the Seahawks signed him to the practice squad on November 18, 2013.[10] On June 2, 2015, Seahawks offensive coordinator Darrell Bevell announced that Daniels would be making the switch to wide receiver for the 2015 season.[11] Daniels was waived by the Seahawks on October 13, 2015. The team re-signed him two days later.[12] On October 27, 2015, the Seahawks waived Daniels, but he re-signed with the team's practice squad soon after.[13][14] On November 24, 2015, he was promoted to the active roster.[15] On December 15, 2015, Daniels was waived.[16]
Houston Texans
On December 21, 2015, Daniels was signed off the Seattle Seahawks' practice squad by the Houston Texans.[17] On December 27, 2015, Daniels made his Texans debut against the Tennessee Titans, passing 1–2 for 7 yards and rushing for 6 yards.[18]
New York Giants
On May 9, 2016, Daniels signed a contract with the New York Giants.[19] On June 17, 2016, he was released by the Giants.[20]
Chicago Bears
On July 27, 2016, Daniels signed a contract with the Chicago Bears.[21] On September 3, 2016, he was released by the Bears as part of final roster cuts.[22]
Atlanta Falcons
On December 19, 2016, Daniels was signed to the Atlanta Falcons' practice squad.[23] He signed a reserve/future contract with the Falcons on February 7, 2017.[24] In June 2017, it was reported that Daniels had converted to running back.[25] He was released by the team on August 15, 2017.[26]
In 2019, Daniels was a member of the 2020 XFL Draft class, and was selected by the Seattle Dragons during the open phase.[32] He made his XFL debut in place of an injured Brandon Silvers and threw one incomplete pass. On February 29, 2020, Daniels came in for relief after Brandon Silvers was unable to be successful in the first half and helped his team score their first touchdown of the game, on a run by Kenneth Farrow, and then scored his first points as an XFL player, on a 1-Pt conversion. He had his contract terminated when the league suspended operations on April 10, 2020.[33]
^Knight, Joey (January 30, 2019). "Trio of former Bulls makes Orlando Apollos' roster". Tampa Bay Times. Retrieved January 31, 2019. Former Bulls QB B.J. Daniels, taken by Salt Lake in the second round of the inaugural AAF draft, isn't listed on the Stallions' final roster.