Stylistically, Japart's music is influenced by Busnois, one of the earlier group of Burgundian composers.
He was fond of the quodlibet, the combination of several pre-existing tunes in ingenious ways, and he also wrote puzzle canons — compositions which the singers were intended to figure out from clues given in the text.
For example, one of his chansons can only be performed correctly by transposing one of the parts down a twelfth and singing it in retrograde motion.
(When a puzzle canon is solved correctly, the parts fit together without violation of the prevailing rules of counterpoint, which in the 15th century are described in the works of theorists such as Tinctoris.)
Japart's music was evidently popular, since many of his chansons were reprinted by Petrucci and achieved wide distribution.