The montane Javan niviventer is a rodent of Java's highlands. Its back is described as soft gray-brown, with a white to cream underside.
The back is soft and velvety gray-brown. The underside is white or cream, and the tail is dark above and lighter below.
Records from the study area place it in montane forest at about 1,800–2,200 m. The account documents forest occurrence but does not detail its diet or activity period.
An extinction-risk assessment has not been added yet.