N.J. Stat. § 2A:50-4
If, after the foreclosure and sale of mortgaged premises, the person entitled to the debt shall recover a judgment in an action on the bond or note for any balance of debt, such recovery shall open the foreclosure and sale of the premises, and the person against whom the judgment has been recovered may redeem the property by paying the full amount of money for which the judgment in the foreclosure action was granted, with interest to be computed from the date of the judgment in the foreclosure action, and all costs of the action for deficiency, and all reasonable expenses which the purchaser may have incurred in the meantime for taxes, assessments, other prior liens, necessary repairs upon the premises and interest on same, after deducting from the amount thereof such income as the holder may have derived from the possession of the premises, either as rent or otherwise.
An action for redemption of the premises shall be brought within 6 months after the entry of the judgment for the balance of the debt.
N.J.S. § 2A:50-4