title: how to configure extjs reader to read this json?
body: <p>I've configured extjs store to load data from useragentstring.com api, this api return data like this</p>
  
  <pre><code>{"agent_type":"Browser","agent_name":"Opera","agent_version":"9.70","os_type":"Linux","os_name":"Linux","os_versionName":"","os_versionNumber":"","os_producer":"","os_producerURL":"","linux_distibution":"Null","agent_language":"English - United States","agent_languageTag":"en-us"}
  
  Ext.define('Oms.model.Userinfo', {
      extend  : 'Ext.data.Model',
      fields  : ['agent_type', 'agent_name', 'agent_version', 'os_type', 'os_name']
  });
  
  Ext.define('Oms.store.Userinfo', {
      extend      : 'Ext.data.Store',
      model       : 'Oms.model.Userinfo',
      proxy: {
          type    : 'jsonp',
          reader  : {
              type: 'json',
              root: ''
          }       
      }
  });
  </code></pre>
  
  <p>this store throws a error </p>
  
  <p><img src="https://i.stack.imgur.com/TCE9u.jpg" alt="enter image description here"></p>
  
  <p>maybe this happen because there is no root in this json ?</p>
  
  <p>any idea how to read this output and load store correctly?</p>
  
  <p>Regards</p>