title: How do I extract value from Json
body: <p>I am getting a response String from server like below</p>
  
  <pre><code>{
    "name": "Json",
    "detail": {
      "first_name": "Json",
      "last_name": "Scott",
      "age": "23"
    },
    "status": "success"
  }
  </code></pre>
  
  <p>I want to get the value of First name. How can I do that? Thanks in Advance.</p>