Javascript - check for an object

Question

I am trying to create for javascript / jquery test to check if my object is empty and cannot understand.

Here is an object when there is something in it:

{"mergedSellerArray":{"key1114":"1120"}}

And here is the object when empty:

{"mergedSellerArray":{}}

This is an ongoing test based on another SO answer, but it does not work:

var sellers = JSON.stringify({mergedSellerArray});
if(Object.keys(sellers).length === 0 && sellers.constructor === Object) {
    console.log("sellers is empty!");
}

Answer 1

You tested sellers, which is not empty, because it contains mergedSellerArray. You need to checksellers.mergedSellerArray

let sellers = {
  "mergedSellerArray": {}
};
if (Object.keys(sellers.mergedSellerArray).length === 0 && sellers.mergedSellerArray.constructor === Object) {
  console.log("sellers is empty!");
} else {
  console.log("sellers is not empty !");
}

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Answer 2

Here in jQuery:

$(document).ready(function(){
	var obj={"mergedSellerArray":{}};
	alert("is empty: "+$.isEmptyObject(obj.mergedSellerArray));

        var obj2={"mergedSellerArray":{"key1114":"1120"}};
	alert("is empty: "+$.isEmptyObject(obj2.mergedSellerArray));
})

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

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jsfidle: https://jsfiddle.net/nyqgbp38/