HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>input hidden demo</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 28rem; }
    #log { margin-top: 12px; padding: 12px; background: #f1f5f9; font-family: monospace; white-space: pre-wrap; }
  </style>
</head>
<body>
  <form>
    <input type="hidden" name="csrf" value="abc123">
    <input type="hidden" name="userId" value="42">
    <input type="text" name="username" value="ada">
  </form>
  <div id="log"></div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    var lines = [];
    $("input:hidden").each(function () {
      lines.push(this.name + " = " + this.value);
    });
    $("#log").text(lines.join("\n"));
  </script>
</body>
</html>

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input:hidden — form tokens (Try It)