javascript - Getting first JSON property

Question

Is there a way to get the name of the first property of a JSON object?

I'd like to do something like this:

var firstProp = jsonObj[0];

edit: I'm getting a JSON object which hold categories of arrays with image URLs.

like so:

{
  "category1":["image/url/1.jpg","image/url/2.jpg"],
  "category2":["image/url/3.jpg","image/url/4.jpg"]
}

I am then iterating through the object to insert the images, and all I really wanted was an elegant way to see which category was inserted first. At first I just did

for (var cat in images) {
    if (i==0) firstCat = cat;
    ...
}

But that some how "felt" ugly... So it was basically just a question of elegance.

Answer 1

console.log(jsonObj[Object.keys(jsonObj)[0]]);