N.J. Stat. § 40:74-18
If a majority of the qualified electors voting on the proposed ordinance shall vote in favor thereof, such ordinance shall thereupon become a valid and binding ordinance of the municipality. An ordinance proposed by petition, or which shall be adopted by a vote of the people, shall not be repealed or amended within 3 years of the date of adoption by the voters, except by a vote of the people; except that an ordinance proposed by petition to increase or decrease either the term of office of the members of the governing body or the number of members of the governing body, or regarding the division of the municipality into a number of wards, shall not be submitted to the voters of the municipality more than once in any 10-year period.
N.J.S. § 40:74-18