title: JSON parsing in javascript
body: <p>I'm trying to parse JSON in JavaScript. If my JSON data looks like below, I want to iterate through all the JSON elements that start with "custom" and not with any other string. How do I do this? </p>
  
  <pre><code>{
      "fields": {
          "custom12": {
              value: "dsada"
          },
          "custom45": {
              value: "adsadad"
          },
          "test12": {
              value: "12323"
          }
      }
  }​
  </code></pre>