title: parse data from JSON url using javascript
body: <p>I want to make an ajax request and parse the JSON response.
  I have tried to do so with this code but with no luck</p>
  
  <pre><code>var url = 'http://api.steampowered.com/ISteamUser \
            /ResolveVanityURL/v0001/?key=private_key&amp;vanityurl=zacktm'
  $.getJSON(url, function(data) {
      alert(data);
  });
  </code></pre>
  
  <p>The response that I get is:</p>
  
  <pre><code>{
  "response": {
      "steamid": "76561198181548891",
      "success": 1
    }
  }
  </code></pre>
  
  <p>the output I want: <code>76561198181548891</code></p>