Johnson played as a youth with the Saskatoon Blazers in the SMAAAHL, before he was signed by major junior club, the Red Deer Rebels of the Western Hockey League (WHL).

[1] As an undrafted free agent, Johnson was signed by the Chicago Blackhawks to a three-year, entry-level contract on March 6, 2019.

[2] Following a first-round exit with the Rebels to complete his junior career, Johnson embarked on his professional career by joining the Blackhawks AHL affiliate, the Rockford IceHogs, for the final stages of the 2018–19 season, posting 4 assists through 6 games.

On January 21, 2021, he was added to Chicago's Taxi squad, and through a growing list of players ruled out through the COVID protocol, Johnson was called up to make his NHL debut with the Blackhawks against the Columbus Blue Jackets on January 31, 2021.

[4] After six seasons within the Blackhawks organization, Johnson left as a free agent and was signed to a one-year, two-way contract with the Minnesota Wild on July 1, 2024.