N.J. Stat. § 40:56-64
Every assessment for local improvements of any kind, together with interest thereon and all costs and charges connected therewith, shall upon the effective date of the ordinance or resolution authorizing the assessment be a first lien upon the real estate described in the assessment, paramount to all prior or subsequent alienations and descents thereof or encumbrances thereon, except subsequent taxes or assessments, notwithstanding any mistake in the name of the owner or any omission to name any owner who is unknown, and notwithstanding any lack of form therein or in any other proceeding which does not impair the substantial rights of the owner or other person having a lien upon or interest in any such real estate. Confirmation of the assessment by the Superior Court shall not affect the validity and commencement of a lien against land that has been assessed for benefits, but shall be considered to affect only the amount of the lien. All assessments for local 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. § 40:56-64