N.J. Stat. § 13:17-53
Every assessment for any improvement together with interest thereon and all costs and charges connected therewith shall be upon authorization of the assessment by ordinance or resolution a first lien on the land described in the assessment, paramount to all prior or subsequent alienations and descents of such land or encumbrances thereon, shall constitute a lien in the same manner as taxes and assessments for State purposes notwithstanding any mistake in the name or names of any owner or owners, or any omission to name any owner or owners who are unknown, and notwithstanding any lack of form therein, or in any proceeding which does not impair the substantial rights of the owner or owners or person or persons having a lien upon or interest in any such land. Confirmation of the amount of the assessment by the commission or by the court shall be considered as determining the amount of the existing lien and not as establishing the lien. All assessments for improvements shall be presumed to have been regularly assessed and confirmed and every assessment or proceeding preliminary thereto shall be presumed to have been regularly made or conducted until the contrary be shown.
N.J.S. § 13:17-53