title: how to get String data from jsonobject
body: <p>I have a json array like below and want to get firstname and lastname from form it any help form guzs please </p>
  
  <pre><code>{
      "message": "Verification",
      "data": {
          "accountStatus": "OPEN",
          "firstName": "Y",
          "lastName": "SHITTU",
          "customerType": "SUD",
          "invoicePeriod": 1,
          "dueDate": "2017-09-09T00:00:00+01:00",
          "customerNumber": 309804811
      },
      "status": "success"
  }
  </code></pre>