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Checking if a key exists in a JS object

I have the following JavaScript object:

var obj = {
    "key1" : val,
    "key2" : val,
    "key3" : val

Is there a way to check if a key exists in the array, similar to this?

testArray = jQuery.inArray("key1", obj);

does not work.

Do I have to iterate through the obj like this?

jQuery.each(obj, function(key,val)){}


Use the in operator:

testArray = 'key1' in obj;

Sidenote: What you got there, is actually no jQuery object, but just a plain JavaScript Object.