[1][2] Janson became the youngest child to have a regular radio spot in a show named Victoria when she was five years old.
[citation needed] Janson's first major television work was as Nicole Owen on Hollyoaks.
She made her West End debut in 2009, playing Louise in New Boy at Trafalgar Studios.
She is married to Swedish singer, Eurovision Song Contest 2015 winner and presenter Måns Zelmerlöw.
In December 2017, Zelmerlöw revealed to Swedish press that the couple were expecting a child together.