N.J. Stat. § 2A:50-33
When, in cases where the whole sum secured by a mortgage is not due, a judgment of the court shall be made for the sale of the mortgaged premises, either for the nonpayment of any portion or installment of the debt or demand intended to be secured by the mortgage, or the nonpayment of interest due, or both, and it shall appear to the court that a part of the mortgaged premises cannot be sold to satisfy the amount due without material injury to the remaining part of the mortgaged premises, and that it is just and reasonable that the whole of the mortgaged premises should be sold together, the court may order a sale to be made of all of the mortgaged premises, the proceeds of such sale, or so much thereof as shall be necessary, to be applied, as well to the payment of the interest, installments or portions then due, and also the costs then due and payable, as to the payment of the whole or residue of the debt or demand not then due and payable; and the residue of the proceeds of such sale to be paid to the person or persons entitled to receive the same, or to be brought into court to abide the further order of the court, as the equity and circumstances of the case require.
When, however, the residue of the debt or demand intended to be secured by the mortgage is payable at a future day without interest, and the mortgagee is willing to receive the same, the court shall deduct a rebate of legal interest for the amount the mortgagee shall receive on such debt or demand, to be computed from the time of the actual payment thereof to the time when such residue would have become due and payable.
N.J.S. § 2A:50-33