N.J. Stat. Ann. § 2A:44-177

Nothing in this article shall be construed so as to prevent the lien claimant from maintaining an action for the debt, notwithstanding the existence of the lien, either before or after the sale provided for by this article; provided, however, that the proceeds of any such sale after the deduction of the expenses thereof shall be credited upon the debt so due. If the sale should be held prior to the entry of judgment, judgment shall be entered only for the difference between the debt due and the net proceeds of the sale. If the sale be held subsequent to the entry of judgment, said judgment shall be credited with the net proceeds of such sale.