His mother is a nurse while his father served as the public address announcer for the Victoriaville Tigres of the Quebec Major Junior Hockey League (QMJHL).

[3] Danault set new career highs during the 2010-11 season and was recognized with accolades from the Quebec Major Junior Hockey League (QMJHL).

[3] Danault received the Guy Carbonneau Trophy as the QMJHL's best defensive forward after he recorded 23 goals and 44 assists through 64 games.

[8] Danault's final draft ranking was 27th among North American skaters[7] and he was selected in the first round, 26th overall, by the Chicago Blackhawks.

[11] He started the season strong by recording 18 points in his first 19 games and was selected to represent Team QMJHL in the 2011 Subway Super Series.

Upon the Tigers' elimination from the 2012 playoffs, Danault was reassigned to the Blackhawks' American Hockey League (AHL) affiliate, the Rockford IceHogs, for the remainder of their season.

[32] After tallying five points through 30 games, Danault was traded to the Montreal Canadiens (along with Chicago's second-round pick in the 2018 NHL entry draft) in exchange for forwards Dale Weise and Tomáš Fleischmann on February 26, 2016.

[34] On January 13, 2018, during a game against the Boston Bruins, Danault was hit in the head by a shot from Zdeno Chára and remained motionless on the ice for several minutes.

[39] After becoming an unrestricted free agent, Danault signed a six-year, $33 million contract with the Los Angeles Kings on July 28, 2021.

[40] Danault finished the 2021–22 season with a career-high 27 goals,[1] en route to helping them clinch a playoff spot for the first time since 2018.

[45] Danault finished the first-round series with three goals and two assists through seven games[1] and was recognized with numerous team, fan and local media honours.

[47] At the conclusion of the regular season, Danault received the Daryl Evans Youth Hockey Service Award for his role in the Kings Learn-to-Play programming.