In 1998 the career of Alx in karting. Back in 1999, drove Danielsson in the next class racing (Formula Ford, Sweden). From 2004, he gained experience in Asia and Europe racing class Formula Renault V6. Since 2005 Alx Danielsson was a regular in the World Series by Renault for the British team Comtec Racing. To win this championship in 2006 was his greatest success so far. Danielsson benefited from a disqualification of Pastor Maldonado, which was confirmed in January 2007.
In 2007 he joined the Euro Series 3000, today the Auto GP, but where he faces a victory, only the first half of the season could deny and was replaced by Luiz Razia. Alx Danielsson has since no longer active in Formula racing, 2011, he starts in the Scandinavian Touring Car Championship.