N.H. Rev. Stat. Ann. § 601:3-a

If there is no provision in RSA 601:2 or 3, any county attorney may charge a person with a felony not punishable by death by preparing a complaint charging such felony and serving the same on the defendant in order that the defendant may have an opportunity to waive indictment on such felony, and if the defendant does so waive indictment, and the superior court approves the waiver, after an affidavit of service on the defendant has been filed, the defendant shall be held to answer and the superior court shall have as full jurisdiction of the complaint as if an indictment had been found.