N.J. Stat. Ann. § 2A:56-18

Where lienors have not been made parties, the court may, before ordering sale of the premises, on motion of any party, admit as a party a person having a lien, by mortgage, judgment, decree, or otherwise, on the undivided interest, share or estate of any of the parties, and may thereupon ascertain and determine whether the shares or interests of the parties to the action, or any of them, are subject to a lien or encumbrance by mortgage, devise, judgment or decree or otherwise, and if so, to what liens or encumbrances, and by whom they are held.