title: Unmarshal JSON with unknown field name
body: <p>I have a JSON object, something like this:</p>
  
  <pre><code>{
      "randomstring": {
          "everything": "here",
          "is": "known"
      }
  }
  </code></pre>
  
  <p>Basically everything inside the <code>randomstring</code> object is known, I can model that, but the <em>randomstring</em> itself is random. I know what it's going to be, but it's different every time. Basically all the data I need is in the <em>randomstring</em> object. How could I parse this kind of JSON to get the data?</p>