Johnston's genet is a West African forest genet. Spots may join into lines along its back, and pale rings continue to the tip of its tail.
Blackish-brown to rufous-brown spots contrast with a dark mid-dorsal line. The first two rows of spots may join partly or completely, and pale rings continue to the tip of the tail.
Its behavior and diet in the wild are poorly known. A 2016 assessment describes it as an inhabitant of dense rainforest and reports records in swamp forest and riverine habitat in Taï National Park, Côte d'Ivoire. A specimen from moist woodland and savanna in Guinea leaves its habitat limits uncertain.
An extinction-risk assessment has not been added yet.