N.J. Stat. § 40:37A-46
The governing body of a county may by ordinance or resolution, as appropriate, create a public body corporate and politic under and pursuant to this act, under the name and style of "the county improvement authority," with all or any significant part of the name of said county inserted. Said body shall consist of the 5 members thereof, who shall be residents of the county and be appointed by ordinance or resolution of said governing body as hereinafter provided, and it shall constitute the authority contemplated and provided for in this act and an agency or instrumentality of said county. Copies of said ordinance or resolution for the creation of the authority, certified by the clerk of said governing body, shall be filed in the office of the Secretary of State and in the office of the Division of Local Government Services in the Department of Community Affairs. A copy of any such certified ordinance or resolution, duly certified by or on behalf of the Secretary of State, shall be admissible in evidence in any action or proceeding and shall be conclusive evidence of due and proper adoption and filing thereof as aforesaid. After such filing in the office of the Secretary of State, a copy of said ordinance or resolution shall be published at least once in a newspaper published or circulating in the county, together with a notice stating the fact and date of its adoption and the date of the first publication of such notice. If no action questioning the validity of the creation or establishment of the authority shall be commenced within 45 days after the first publication of such notice, then said authority shall be conclusively deemed to have been validly created and established and authorized to transact business and exercise powers as a public body created pursuant to this act.
N.J.S. § 40:37A-46