@Kfeeney1025 -- If you lived in PA all year, your employer should not have withheld NJ taxes from your W-2 income. Your entire income is taxable by PA.
In order to obtain a refund of the incorrectly withheld NJ taxes, you'll have to file a non-resident NJ return, showing zero NJ income.
And if you haven't done so already, submit New Jersey Form NJ-165 to your NJ employer. Here's a link to that form: https://www.state.nj.us/treasury/taxation/pdf/current/nj165.pdf
**Answers are correct to the best of my ability but do not constitute tax or legal advice.
