Jansson started playing football in IFK Sollentuna. In the summer of 2012, she went to Hammarby IF.[1] Jansson made her debut on 1 August 2012 in a 3–1 win over Vasalunds IF, where she was substituted at the end of the first half and also scored her first goal.[2] She made her Allsvenskan debut in 2015 and played a total of four seasons in the club.[3][4]
In November 2016, Jansson was recruited by KIF Örebro, where she signed a two-year contract.[7][8] KIF Örebro were relegated to Elitettan and after the 2017 season Jansson left the club.[9][10]
Before the 2018 season, Jansson returned to Hammarby IF, where she signed a two-year contract.[11] Jansson won the internal shooting league in 2018 with six goals scored and after the season she extended her contract by two years.[12] In November 2020, Jansson extended his contract in Hammarby by two years.[13]
In December 2022, Jansson was signed by FC Rosengård, where she signed a three-year contract.[14]
National team career
Emma Jansson made her national team debut during the qualifying game for the U-19 European Championship. She was selected for the national team that played during the playoffs in Israel in 2015. Sweden took gold after defeating Spain 3–1 in the final.