title: replace the first two character in JSON object using javascript
body: <p>I need to replace the first two string from JSON object </p>
  
  <p>my JSON object is </p>
  
  <pre><code>{userName: "TT-RRR-000", sName: "KLIU"}
  </code></pre>
  
  <p>I need to update my JSON object to</p>
  
  <pre><code>{userName: "LL-RRR-000", sName: "KLIU"}
  </code></pre>
  
  <p>how can I do that? I tried with string <code>replace</code> method but it not working for me </p>
  
  <p><strong>EDIT:</strong></p>
  
  <p>The character[s] will not be <code>TT</code> it may be anything. I need to replace the first two characters of the string</p>