Crowder spent the summer holidays in Florida, working out and training with his father, then a professional basketball player with 2 years experience in the NBA who was playing in Europe.

[6] On January 1, 2011, Crowder recorded a career-high 29 points and 8 rebounds in a game against the West Virginia Mountaineers.

[3] After finishing his college career, Crowder decided to enter the 2012 NBA draft, where he was projected to be a second-round pick.

[19] The Mavericks were never able to recover from Nowitzki's injury and missed the playoffs for the first time in 12 years, with Crowder averaging 5 points and 2.4 rebounds per game in 17.3 minutes.

[23] With the offseason additions of forwards Al-Farouq Aminu and Richard Jefferson, Crowder's minutes subsequently dropped to start the 2014–15 season, falling out of coach Rick Carlisle's frontcourt rotation.

[27] On April 14, 2015, he hit an off-balance fall-away two-point shot from deep on the right wing with 0.8 seconds left, lifting Boston to a 95–93 win over the Toronto Raptors.

[36] In the Celtics' season opener on October 26, 2016, Crowder scored 21 points in a 122–117 win over the Brooklyn Nets.

[42] On August 22, 2017, Crowder was traded, along with Isaiah Thomas, Ante Žižić and the Brooklyn Nets' 2018 unprotected first round pick, to the Cleveland Cavaliers in exchange for Kyrie Irving.

[43] Eight days later, the Celtics agreed to send the Cavaliers a 2020 second-round draft pick via the Miami Heat to complete the trade.

[45] On February 8, 2018, Crowder was acquired by the Utah Jazz in a three-team trade that also involved the Cavaliers and the Sacramento Kings.

[46] In his debut for the Jazz three days later, Crowder scored 15 points in a 115–96 win over the Portland Trail Blazers.

[48] In Game 5 of the Jazz's first-round playoff series against the Oklahoma City Thunder, Crowder scored a career playoff-high 27 points in a 107–99 loss.

[50] On July 6, 2019, the Memphis Grizzlies acquired Crowder from the Jazz, along with Grayson Allen, Kyle Korver and draft picks for Mike Conley Jr.[51] He made his Grizzlies debut on October 23, recording 13 points, five rebounds and two assists in a 120–101 loss to the Miami Heat.

[52] On October 27, Crowder hit the buzzer beating, game-winning three-pointer to defeat the Brooklyn Nets 134–133 in overtime.

[54] On January 4, 2020, Crowder scored a season-high 27 points, alongside eight rebounds, seven assists, three steals and three blocks in a 140–114 win over the Los Angeles Clippers.

On February 9, Crowder made his Heat debut, recording 18 points, eleven rebounds, three assists and two steals in a 115–109 loss to the Portland Trail Blazers.

[59][60] He made his Suns debut on December 23, recording four points, nine rebounds and four assists in a 106–102 win over the Dallas Mavericks.

[61] On April 12, 2021, Crowder scored a season-high 26 points, alongside two rebounds and two assists, in a 126–120 win over the Houston Rockets.

On June 22, 2021, in Game 2 of the Western Conference Finals, with 0.9 seconds remaining in regulation, Crowder inbounded the ball from behind the baseline to Deandre Ayton for a buzzer-beating, game-winning alley-oop dunk to lift the Suns to a 104–103 victory over the Los Angeles Clippers.

On December 6, 2021, Crowder scored a season-high 19 points, alongside six rebounds, in a 108–104 win over the San Antonio Spurs.

He has a good three point shot and postplay, as well as being solid from long range, averaging .498 from the field and .345 from the three-point line in his senior season at Marquette.

[9] Crowder has a tremendous work ethic, growing from a chubby kid into a muscular player, training with intense will and commitment to improve his skills.

[2] Rick Carlisle compared him to Tayshaun Prince, whom he coached while with the Detroit Pistons, stating: "Jae just has a maturity beyond his years.

At his introductory press conference in Cleveland, he said, "The good thing about the whole ordeal was I was able to whisper it to my mom before she passed.