title: How to remove empty string fields in OutputRoot.JSON.Data esql
body: <p>How do I iterate OutputRoot.JSON.Data and remove empty string fields</p>
  
  <p><strong>Input</strong></p>
  
  <pre><code>{
  firstName : 'test,
  lastName : ''
  }
  </code></pre>
  
  <p><strong>Result</strong></p>
  
  <pre><code>{
  firstName : 'test'
  }
  </code></pre>