Journalism++ was founded in 2011 par Nicolas Kayser-Bril, Anne Lise Bouyer and Pierre Romera, three former employees of OWNI (fr), a Paris-based news website that pioneered datajournalism in France.
Between 2013 and 2016, Journalism++ coordinated the Migrants' Files project, which aimed at measuring the number of persons who died in their attempt to reach or stay in Europe since 2000, and the cost associated with the so-called Fortress Europe policies. The project brought together 25 journalists and was published by several media outlets, notably Süddeutsche Zeitung, Libération and Český rozhlas in 2014 and 2015. The collected data served as the basis for the database of the International Organization for Migration on the same topic, which started in 2014.
- Alla Rybina (30 October 2014). "J++ Stockholm about the development of data journalism in Sweden". Open Knowledge Sweden.
- Ismaël Halissat (24 April 2014). "Rencontre avec deux journalistes++" (in French). Radio France Internationale.
- Antonie Rietzschel (18 June 2015). "So viel kostet die Festung Europa" (in German). Süddeutsche Zeitung.
- "Le projet "Migrants Files"" (in French). Libération. 17 June 2015.
- Jan Cibulka, Marcel Šulek, Petr Kočí (17 June 2015). "Kolik nás stojí "pevnost Evropa"" (in Czech). Český rozhlas.
- Fatal Journeys: Tracking Lives Lost during Migration (PDF). International Organization for Migration. 2014. p. 20.
- Alison Langley (12 November 2014). "European Union journalists cross borders for story collaboration". Columbia Journalism Review.
- "The Innovation Award – Winners 2015". European Press Prize.