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    <p>Objects in JavaScript are collections of <em>unordered</em> properties. Objects are hashtables. </p> <p>If you want your properties to be in alphabetical order, one possible solution would be to create an index for your properties in a separate array. Just a few hours ago, I answered a question on Stack Overflow which you may want to check out:</p> <ul> <li><a href="https://stackoverflow.com/questions/4041762/iterating-over-a-javascript-object-in-sort-order-based-on-particular-key-value-of/4041878#4041878">Iterating over a JavaScript object in sort order based on particular key value of a child object</a></li> </ul> <p>Here's a quick adaptation for your object<sup>1</sup>:</p> <pre><code>var obj = { "set1": [1, 2, 3], "set2": [4, 5, 6, 7, 8], "set3": [9, 10, 11, 12] }; var index = []; // build the index for (var x in obj) { index.push(x); } // sort the index index.sort(function (a, b) { return a == b ? 0 : (a &gt; b ? 1 : -1); }); </code></pre> <p>Then you would be able to do the following:</p> <pre><code>console.log(obj[index[1]]); </code></pre> <p>The <a href="https://stackoverflow.com/questions/4041762/iterating-over-a-javascript-object-in-sort-order-based-on-particular-key-value-of/4041878#4041878">answer I cited</a> earlier proposes a reusable solution to iterate over such an object. That is unless you can change your JSON to as <a href="https://stackoverflow.com/questions/4044845/retrieving-a-property-of-a-json-object-by-index/4044892#4044892">@Jacob Relkin suggested in the other answer</a>, which could be easier.</p> <hr> <p><sup>1</sup> You may want to use the <a href="https://developer.mozilla.org/en/JavaScript/Reference/Global_Objects/Object/hasOwnProperty" rel="nofollow noreferrer"><code>hasOwnProperty()</code></a> method to ensure that the properties belong to your object and are not inherited from <code>Object.prototype</code>.</p>
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    1. USDaniel Vassallo
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    1. COThat is one elaborate answer that you got over there :) However, shouldn't you be doing a `hasOwnProperty` check inside the `for in` loop? (In case that something augmented the `Object.prototype` object.)
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      1. USŠime Vidas
    2. CO@Šime Vidas: Yes, didn't want to complicate the example too much... But good idea. I'll update that answer and this one with a note on that.
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