The junior championships for club teams (juniormästerskap för klubblag, also junior-SM or JSM) for boys have been played since 1982, but the competition had several unofficial precursors.

[1][2] A cup tournament, Allsvenska ungdomscupen, was played from 1945 to 1976, and was open to member clubs of the Swedish Professional Football Leagues.

[1] The title unofficial junior champions was awarded to the winners of the tournament, which was discontinued when the newspaper Expressen withdrew their sponsorship.

A champion was decided through a final match between group winners, and was open to all Swedish Professional Football Leagues members from 1977.

[5] The championship is played in league format, currently named P19 Allsvenskan, until 2021 consisting of two regional groups, followed by a final between the two winning teams to determine the junior champions.