Prettify JSON data in textarea input in JavaScript?

Javascript Web Development Object Oriented Programming

For this, use JSON.parse() along with JSON.stringify().

Example

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initialscale=1.0">
<title>Document</title>
<link rel="stylesheet" href="//code.jquery.com/ui/1.12.1/themes/base/jquery-ui.css">
<script src="https://code.jquery.com/jquery-1.12.4.js"></script>
<script src="https://code.jquery.com/ui/1.12.1/jquery-ui.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/fontawesome/4.7.0/css/font-awesome.min.css">
</head>
<body>
<textarea id="prettyJSONFormat" cols=100 rows=20></textarea>
<button onclick="printTheJSONInPrettyFormat()">Click The Button To
get the Pretty JSON</button>
<script>
   function printTheJSONInPrettyFormat() {
      var badJSON = document.getElementById('prettyJSONFormat').value;
      var parseJSON = JSON.parse(badJSON);
      var JSONInPrettyFormat = JSON.stringify(parseJSON, undefined, 4);
      document.getElementById('prettyJSONFormat').value =
      JSONInPrettyFormat;
   }
</script>
</body>
</html>

To run the above program, just save the file name anyName.html(index.html) and right click on the file and select the option open with live server in VS Code editor.