Generally no, however, if you want to claim a refund of taxes you had withheld or you are eligible for a NJ earned income credit, then you still may want to file.
If you are a nonresident and have no New Jersey income or you are a resident of PA which is a NJ reciprocal state, you would not need to file a return, unless again, you are claiming a refund of taxes withheld for the state.
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