JSAs and JSBs were a model for organising the data protection supervision of several large-scale IT databases operated atthe European level, and for certain agencies in the law-enforcement field. Essentially, they comprised representatives of national DPAs. They existed for, among others, Europol and the Schengen Information System under the Schengen Convention.

Most JSAs and JSBs have been abolished. The remaining ones are the Customs JSA, dealing with parts of the Customs Information System and the Eurojust JSB, which will operate until the new Eurojust Regulation (EU) 2018/1727 becomes applicable. The two levels usually cooperate in Supervision Coordination Groups, the secretariats for which are usually provided by the EDPS.