As a resident of New Jersey with less than $10K of taxable income, you have no tax liability in the state of NJ. See the chart on page 3 for filing requirements. NJ 1040 Filing Instructions
You should however, file a return if any of the following apply:
• You had New Jersey Income Tax withheld and are due a refund.
• You paid New Jersey estimated taxes for 2018 and are due a refund.
• You are eligible for a New Jersey Earned Income Tax Credit or other credit (Wounded Warrior Caregiver or Renter's/Property Tax) and are due a refund.