You may not have to declare that you earned all your wages in NJ. It depends whether you were forced to work from home or did so for your own convenience.
During the coronavirus pandemic, New Jersey kept in place pre-COVID-19 tax arrangements with regards to employee residency even if an employee was working from home in a different state. Meaning, a New York resident who worked in a NJ office but was forced to work from home was considered to still be "working in NJ" and subject to NJ tax.
NJ changed its rules on September 30. See Teleworking – End of COVID-19 Temporary Suspension Period for Nexus and Withholding Purposes.
The state still follows the "convenience of the employer" rule. You are still liable for NJ tax after September 30 if you are working from home our of choice and not for any business purpose.
Check you W-2 to see whether your NJ Box 16 wages are 100% of your income.
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