She then moved to Stockholm and became a sub-editor for Dagny, the journal of the women's rights organisation the Fredrika Bremer Association.

In 1901 she left Dagny to write for Stockholms Dagblad, contributing literary criticism under her own name and humorous stories under the name Huck Leber.

[2] She wrote for the newspaper until 1912; during this period, The History of Nordic Women's Literature notes that Johanson "was described as Sweden's most eloquent critic with the highest aesthetic sensitivity".

[3] She translated the works of several other writers, including Henri-Frédéric Amiel's Fragments d'un journal intime and Rosa Mayreder's Geschlecht und Kultur.

After her death in 1948,[5] Nils Afzelius [sv] published three collections of Johanson's writing: K. J. själv (1952, childhood memories), Brev (1953, letters) and Kritik (1957, criticism).