N.J. Stat. Ann. § 19:29-8

The judge shall pronounce judgment whether the incumbent or any contestant was duly elected, and the person so declared elected will be entitled to his certificate; and in the case of a proposition, whether the same was approved or disapproved. If misconduct is complained of on the part of the members of any district board it shall not be held sufficient to set aside the election unless the rejection of the vote of such district would change the result as to that office.