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copied!<p>You can loop through keys like this:</p> <pre><code>for (var key in data) { console.log(key); } </code></pre> <p>This logs "Name" and "Value".</p> <p>If you have a more complex object type (not just a plain hash-like object, as in the original question), you'll want to only loop through keys that belong to the object itself, as opposed to keys on the object's <a href="https://developer.mozilla.org/en/Core_JavaScript_1.5_Guide/Details_of_the_Object_Model" rel="noreferrer">prototype</a>:</p> <pre><code>for (var key in data) { if (data.hasOwnProperty(key)) { console.log(key); } } </code></pre> <p>As you noted, keys are not guaranteed to be in any particular order. Note how this differs from the following:</p> <pre><code>for each (var value in data) { console.log(value); } </code></pre> <p>This example loops through values, so it would log <code>Property Name</code> and <code>0</code>. N.B.: The <a href="https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Statements/for_each...in" rel="noreferrer"><code>for each</code></a> syntax is mostly only supported in Firefox, but not in other browsers.</p> <p>If your target browsers support ES5, or your site includes <a href="https://github.com/es-shims/es5-shim" rel="noreferrer"><code>es5-shim.js</code></a> (recommended), you can also use <code>Object.keys</code>:</p> <pre><code>var data = { Name: 'Property Name', Value: '0' }; console.log(Object.keys(data)); // => ["Name", "Value"] </code></pre> <p>and loop with <a href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach" rel="noreferrer"><code>Array.prototype.forEach</code></a>:</p> <pre><code>Object.keys(data).forEach(function (key) { console.log(data[key]); }); // => Logs "Property Name", 0 </code></pre>

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