N.J. Stat. § 54:5-114.4
Any and all purchasers of the tax sale certificates and subsequent municipal liens purchased, as hereinabove described, must foreclose at their own expense, the right of redemption, and record the final judgment in the county wherein the land is situate within two years from the date of the confirmation of the sale by the governing body. Any and all further or additional assignments of the tax sale certificates shall be promptly recorded in the office of the county clerk or register of deeds, as the case may be, of the county wherein the real property is situate, and a photocopy of the recorded assignment shall be served upon the local tax collector by certified mail, return receipt requested. When assignments have not been recorded and served upon the tax collector, the tax collector and the municipality shall be held harmless for the payment of any redemption amounts to the holder of the tax sale certificate as appears on the records of the tax collector.
N.J.S. § 54:5-114.4