The Enceladus Icy Jet Analyzer (ENIJA) is a time-of-flight mass spectrometer developed to search for prebiotic molecules like amino acids and biosignatures in the plumes of Saturn's moon Enceladus. Most of the ice particles in Enceladus' plume have been shown to be direct samples of subsurface waters, offering an opportunity to assess its internal ocean's geochemical and habitability potential without having to land and drill through the ice. The ENIJA instrument has been formally proposed to fly on two missions: the Enceladus Life Finder (ELF), and on the Explorer of Enceladus and Titan (E2T).