N.J. Stat. Ann. § 19:49-5

Ballots voted for any person whose name does not appear on the machine as a nominated candidate for office are herein referred to as irregular ballots. Such irregular ballot shall be written or affixed in or upon the receptacle or device provided on the machine for that purpose. No irregular ballot shall be voted for any person for any office whose name appears on the machine as a nominated candidate for that office or for a delegate or alternate to a national party convention; any irregular ballot so voted shall not be counted. An irregular ballot must be cast in its appropriate place on the machine, or it shall be void and not counted.