My ex husband according to divorce papers in Bergen county NJ has to show proof of insurance policy every.year by January 31. How can I make him send

If you do not get the paperwork you are entitled to you can try sending the court order to the insurance company and see if they will provide you with the proof independent of getting it from your ex.  you can also file a motion to enforce judgment, and its fairly simple.  You can find the forms on the New Jersey Judiciary website.