How do I count number of objects in array?

Hi. I wanna count number of objects in array. For example: **jsonObj["array"]** is object that store another objects. I can access them by **jsonObj["array"][0]["something"]**, **jsonObj["array"][1]["something"]**, **jsonObj["array"][2]["something"]**, and so on. So how do I count number of objects in **jsonObj["array"]**?

Thank you. :)