N.J. Stat. § 52:27-21
Unless a suit, action or proceeding questioning the validity of notes or bonds, purporting to be issued by virtue of any such resolution, be commenced prior to the expiration of the thirty-day period mentioned in section 52:27-18 of this title, any such notes or bonds reciting that they are issued pursuant to this chapter shall, after their issuance and delivery, if no suit relating thereto is then pending, be conclusively presumed to be fully authorized by all the laws of this state and to have been issued, sold, executed and delivered by the municipality in conformity therewith, and shall not be questioned by the municipality or any taxpayer thereof in any court, anything herein or in other statutes to the contrary notwithstanding.
N.J.S. § 52:27-21