N.J. Stat. Ann. § 46:10B-8

If any mortgage loan or written contract or commitment for such loan provides for an increase in the rate of interest during the term of such loan, or after the execution of a written contract or commitment for such a loan, the increased rate shall not exceed 6% per annum in the case of a loan or written contract or commitment made before the effective date of this act or such rate of interest as may be authorized by law at the time such loan or written contract or commitment for such loan is made in the case of a loan or written contract or commitment for such loan made on or after the effective date of this act.