Javascript - Getting object's keys when object is an array of objects

I am having troubles getting key values in a block of code similar to the following:

var someArray = [];
someArray.push(objX, objY, objZ); //each of these objects pushed in have 1 key/value pair

for (var i = 0; i < someArray.length; i++) {
    switch (Object.keys(someArray[i][0])) { //Not sure that "[i][0]" is valid?
        //now set tags using Jquery
    }
}

So in the above code example I am passing in an array of objects (each object is a single key/value pair). And want to get the key of each of these so I can set the HTML tag that corresponds to each using Jquery.

Thought: just the [i] will be sufficient since the array of each object's keys will only every be 1?

Any help is appreciated!!