You can motion the court if it has not been more than a year since it was entered
RULE 4:50. Relief From Judgment Or Order
4:50-1. Grounds of Motion
On motion, with briefs, and upon such terms as are just, the court may relieve a party or the party's legal representative from a final judgment or order for the following reasons: (a) mistake, inadvertence, surprise, or excusable neglect; (b) newly discovered evidence which would probably alter the judgment or order and which by due diligence could not have been discovered in time to move for a new trial under R. 4:49; (c) fraud (whether heretofore denominated intrinsic or extrinsic), misrepresentation, or other misconduct of an adverse party; (d) the judgment or order is void; (e) the judgment or order has been satisfied, released or discharged, or a prior judgment or order upon which it is based has been reversed or otherwise vacated, or it is no longer equitable that the judgment or order should have prospective application; or (f) any other reason justifying relief from the operation of the judgment or order.
Note: Source-R.R. 4:62-2 (first sentence); amended July 15, 1982 to be effective September 13, 1982; amended July 13, 1994 to be effective September 1, 1994.
4:50-2. Time of Motion
The motion shall be made within a reasonable time, and for reasons (a), (b) and (c) of R. 4:50-1 not more than one year after the judgment, order or proceeding was entered or taken.
Note: Source-R.R. 4:62-2 (second sentence).
4:50-3. Effect of Motion
A motion under R. 4:50 does not suspend the operation of any judgment, order or proceeding or affect the finality of a final judgment, nor does this rule limit the power of a court to set aside a judgment, order or proceeding for fraud upon the court or to entertain an independent action to relieve a party from a judgment, order or proceeding.
If it has been more than a year here Chapter 7 is your only option at this point.