Koen Jansen (born 26 March 1980), better known by his stage name Diggy Dex, is a Dutch rapper. He was a member of the rap group De Amersfoortse Coöperatie (D.A.C.) and started in 2006 as a solo artist.
The group started to perform, at first mostly school parties. Around 2000, they started releasing songs on the internet as mp3. In 2001, they released the clip De Amersfoortse Pracht and won the Small Price of Amersfoort (). They are joined by two new members, drummer Kroes en dj UrbQ. In 2002, they won the people's choice award of the Grote Prijs van Nederland. They released their first album DiDACtici in 2002, of which only 1,000 copies were produced. In 2003, they made a breakthrough with the song Springstof, which is played often on The Box. The increased attention led to concerts on Lowlands and the Uitmarkt. In 2005, they released their second album Professioneel Chillen.
In 2009, Jansen released the single Slaap lekker (Fantastig toch), which was a remix of the song Fantastig toch of Belgian singer Eva De Roovere. It became a hit in both the Netherlands and Flanders. In 2010, Jansen released his third album, Lange nachten korte dagen (Long nights short days). In 2014, Jansen released his fourth album, Do It Yourself.
In 2016, Jansen participated in the TV show Ali B op volle toeren, in which he collaborated with Herman van Veen and Boudewijn de Groot. The same year, Jansen released his fifth album, Golven. In 2018, Jansen released his sixth album, Karavaan. He participated in the Beste Zangers in 2020
In 2021, Jansen was part of the Streamers, a group of Dutch artists who held free livestream-concerts during the COVID-19 lockdowns. After the restrictions had been lifted, a few physical concerts were held. Later that year, he released his seventh album, Carroussel.
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