Anthony Parker returned the favor, nailing a turnaround 3 from the corner with 2.9 seconds left in the extra session to tie it at 127, but Carter won it with a reverse dunk on Bobby Simmons' inbounds pass with 2.1 seconds left.
The Raptors lost forward Jermaine O'Neal to a strained his left knee when he was pulled down on a flagrant foul by New Jersey's Sean Williams with 11:37 left in the fourth.
O'Neal, who is averaging 13.5 points and 9.5 rebounds, stayed down for a minute before walking gingerly to the bench. He returned after a timeout but missed both free throws before being replaced by Kris Humphries and hobbling into the locker room alongside the trainer. A team official said O'Neal, who finished with seven points and seven rebounds, would undergo further tests.
Andrea Bargnani scored a career-high 29 points and had 10 rebounds for Toronto, but missed a pair of 3-pointers in the final 30 seconds of overtime.
Jose Calderon had 26 points and 15 assists for Toronto.
Brook Lopez and Jarvis Hayes each had 14 points for New Jersey.
O'Neal fell backward when Williams tugged on the bottom of O'Neal's jersey as he was going up for a shot. O'Neal landed awkwardly, clutching at his left thigh, above a brace he wears on the knee.
O'Neal missed 40 games last season because of lingering pain from a torn ligament in his left knee that was surgically repaired the previous summer. He joined Toronto in an offseason trade that sent guard T.J. Ford to Indiana.
Harris, New Jersey's leading scorer so far this season, had to go to the locker room early in the third because of an upset stomach, but he returned before the end of the quarter.
Notes: Calderon made all six of his free throws and is 31-for-31 from the line this season. ... Toronto recorded its highest-scoring first quarter (33 points) and first half (61) of the season. ... New Jersey's Eduardo Najera appeared in his 500th career game. ... Buffalo Bills receiver Lee Evans attended the game.
