N.J. Stat. Ann. § 40:73-2

No officer or employee, elected or appointed in any such municipality shall be interested, directly or indirectly, in any contract or job for work or materials, or the profits thereof, or services to be furnished or performed for the municipality, and no such officer or employee shall be interested, directly or indirectly, in any contract or job for work or materials or the profits thereof, or services to be furnished or performed, for any person operating interurban railway, street railway, gas works, waterworks, electric light or power plant, heating plant, telegraph line, telephone exchange, or other public utility within the territorial limits of the municipality.