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If you are looking for proof of a marriage that took place in New Jersey between 1961 and 2016, check the New Jersey Marriage Index, provided on archive.org thanks to Reclaim the Records. This index allows you to easily browse the index to find the full names of the bride and groom, the date and place they were married, and the file number, which may help you acquire a copy of the license, which would provide you with more information.
For marriages prior to 1961, check the New Jersey Resources page or the Marriage Records page.