Jani was born in Gothenburg, Sweden to a Finnish mother and a Serbian father. He moved to Helsinki, Finland in 1993 with his mom, little brother and sister. Jani lived in Finland until 2000. Jani moved back to Gothenburg, Sweden in 2000. After joining Sins of omission in 2002 he moved to Stockholm. Jani is an educated chef. Jani Stefanovic is married to fellow artist Katja Stefanovic a singer songwriter from Finland. They have one daughter.