N.J. Stat. § 2C:29-7
A person set at liberty by court order, with or without bail, or who has been issued a summons, upon condition that he will subsequently appear at a specified time and place in connection with any offense or any violation of law punishable by a period of incarceration, commits an offense if, without lawful excuse, he fails to appear at that time and place. It is an affirmative defense for the defendant to prove, by a preponderance of evidence, that he did not knowingly fail to appear. The offense constitutes a crime of the third degree where the required appearance was to answer to a charge of a crime of the third degree or greater, or for disposition of any such charge and the actor took flight or went into hiding to avoid apprehension, trial or punishment. The offense constitutes a crime of the fourth degree where the required appearance was otherwise to answer to a charge of crime or for disposition of such charge. The offense constitutes a disorderly persons offense or a petty disorderly persons offense, respectively, when the required appearance was to answer a charge of such an offense or for disposition of any such charge. Where the bail imposed or summons issued is in connection with any other violation of law, the failure to appear shall be a disorderly persons offense.
This section does not apply to obligations to appear incident to release under suspended sentence or on probation or parole. Nothing herein shall interfere with or prevent the exercise by any court of this State of its power to punish for contempt.
N.J.S. § 2C:29-7