N.J. Stat. Ann. § 2A:34-23a

If a party in any action to enforce and collect child support ordered by a court pursuant to the provisions of N.J.S. 2A:34-23 has incurred counsel fees, the court shall require the defaulting party to pay those counsel fees unless the court finds that the default was substantially justified or that other circumstances make an award of counsel fees unjust. The court shall determine the appropriate award for counsel fees and shall consider the financial circumstances of the parties and whether each acted in good faith.