Kruse was born in Oslo and started playing the piano at the age of 6.
 She sang in NRK's Girls' Choir, danced ballet, and joined Elisabeth Gordings Barne- og Ungdomsteaterskole while at primary school.
She joined the music program at Foss videregående skole in Oslo 1991.
She got the main role of Sonja in the play Reisen til Julestjernen at the Nationaltheatret in Oslo 1993, becoming the youngest Sonia ever at the Nationaltheatret.
She continued to play the role in 1994, before starting studies in music pedagogy and singing at Norges Musikkhøgskole in 1995.
She applied for Artisten in Göteborg (Högskolan för Teater, Opera och Musikal), and earned a bachelor there in 2001.
Before ending her studies at Artisten, she got the role as Annie Oakley in the musical Annie Get Your Gun at Riksteatret, coming up the next season (2002).
Meanwhile, (in 2001) she played the title role in the newly written Den syngende Frk Detektiv in Fredrikstad, and played a part in the success series Nissene på låven on TV Norge.

Kruse has played several main roles and some minor roles at different theaters in Norway, among them Reisen til Julestjernen, Hair (Det Norske Teatret), Fame, Annie get your gun (Riksteatret og Trøndelag Teater), Den syngende Frøken Detektiv (Oslo Nye Teater), Keisaren av Portugalia, Musical Musikal! (
Det Norske Teatret), and Spellemann på taket (Fiddler on the roof) at Oslo Nye Teater with among others Dennis Storhøi and Alexander Rybak as co-acters.
She was trained at Norwegian College Music in Oslo, and College Theater in Gothenburg.
She has also contributed in different TV series and some motion pictures, as well as given voice to a series of well known cartoon characters in Norwegian version.
Kruse has performed with many big orchestras and choirs around the world.
She has also done some dubbing jobs.

In December 2001 she was one of the fictive participant Marthe in the Christmas calendar series Nissene på låven (TV Norge).
She played a minor part in the TV series Det var en gang et eventyr on NRK1 2008, and did at the same period takes for a TV series by Nordisk Film of one of Unni Lindells books about Cato Isaksen.
Here she played a main character as Police investigator Randi Johansen.
In 2010 she played the character Merete in the comedy film A Somewhat Gentle Man, directed by Hans Petter Moland and with Stellan Skarsgård as Ulrik.

Lately Kruse Jåtog has done some acting at Agder Teater with more modern pieces.
She recently played the role as Annika Brennhagen, in NRK s success drama series "Hjem" (means Home), in 16 episodes (2 seasons) of 45 mins each.

Her debut album as a solo singer artist was the record Jannike Kruse – Med Andre Ord, 2009.
She has been joined by, among others, the text writers Jan Eggum, Ingrid Bjørnov, Anita Skorgan and Silje Nergaard, and she has even dared to show off her own songs and lyrics – in Norwegian.
In 2005 she made an album with childrensongs, Kjente, kjære og noen glemte barnesanger, with Forsvarets musikkorps Trøndelag.
Kruse was born in Oslo and started playing the piano at the age of 6.  She sang in NRK's Girls' Choir, danced ballet, and joined Elisabeth Gordings Barne- og Ungdomsteaterskole while at primary school. She joined the music program at Foss videregående skole in Oslo 1991. She got the main role of Sonja in the play Reisen til Julestjernen at the Nationaltheatret in Oslo 1993, becoming the youngest Sonia ever at the Nationaltheatret. She continued to play the role in 1994, before starting studies in music pedagogy and singing at Norges Musikkhøgskole in 1995. She applied for Artisten in Göteborg (Högskolan för Teater, Opera och Musikal), and earned a bachelor there in 2001. Before ending her studies at Artisten, she got the role as Annie Oakley in the musical Annie Get Your Gun at Riksteatret, coming up the next season (2002). Meanwhile, (in 2001) she played the title role in the newly written Den syngende Frk Detektiv in Fredrikstad, and played a part in the success series Nissene på låven on TV Norge.
Kruse has played several main roles and some minor roles at different theaters in Norway, among them Reisen til Julestjernen, Hair (Det Norske Teatret), Fame, Annie get your gun (Riksteatret og Trøndelag Teater), Den syngende Frøken Detektiv (Oslo Nye Teater), Keisaren av Portugalia, Musical Musikal! (Det Norske Teatret), and Spellemann på taket (Fiddler on the roof) at Oslo Nye Teater with among others Dennis Storhøi and Alexander Rybak as co-acters. She was trained at Norwegian College Music in Oslo, and College Theater in Gothenburg. She has also contributed in different TV series and some motion pictures, as well as given voice to a series of well known cartoon characters in Norwegian version. Kruse has performed with many big orchestras and choirs around the world. She has also done some dubbing jobs.
In December 2001 she was one of the fictive participant Marthe in the Christmas calendar series Nissene på låven (TV Norge). She played a minor part in the TV series Det var en gang et eventyr on NRK1 2008, and did at the same period takes for a TV series by Nordisk Film of one of Unni Lindells books about Cato Isaksen. Here she played a main character as Police investigator Randi Johansen. In 2010 she played the character Merete in the comedy film A Somewhat Gentle Man, directed by Hans Petter Moland and with Stellan Skarsgård as Ulrik.
Lately Kruse Jåtog has done some acting at Agder Teater with more modern pieces. She recently played the role as Annika Brennhagen, in NRK s success drama series "Hjem" (means Home), in 16 episodes (2 seasons) of 45 mins each.
Her debut album as a solo singer artist was the record Jannike Kruse – Med Andre Ord, 2009. She has been joined by, among others, the text writers Jan Eggum, Ingrid Bjørnov, Anita Skorgan and Silje Nergaard, and she has even dared to show off her own songs and lyrics – in Norwegian. In 2005 she made an album with childrensongs, Kjente, kjære og noen glemte barnesanger, with Forsvarets musikkorps Trøndelag.
Jannike Kruse