HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>.serializeArray() param</title>

  <style>

    body { font-family: sans-serif; padding: 16px; max-width: 520px; }

    label { display: block; margin-bottom: 8px; font-size: 14px; }

    input, select { width: 100%; padding: 6px 8px; box-sizing: border-box; margin-top: 2px; }

    button { margin-top: 10px; padding: 8px 14px; cursor: pointer; background: #7c3aed; color: #fff; border: none; border-radius: 6px; }

    .log { margin-top: 14px; padding: 12px; background: #f5f3ff; border-radius: 6px; font-size: 13px; word-break: break-all; }

  </style>

</head>

<body>

  <form id="demo-form">

    <label>Name <input type="text" name="name" value="Jane"></label>

    <label>Role <select name="role"><option value="dev" selected>Developer</option><option value="design">Designer</option></select></label>

  </form>

  <button type="button" id="run">Compare strings</button>

  <div class="log" id="match">—</div>

  <div class="log" id="string">—</div>

  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>

  <script>

    $("#run").on("click", function() {

      var $f = $("#demo-form");

      var fromArray = $.param($f.serializeArray());

      var fromSerialize = $f.serialize();

      $("#match").text(fromArray === fromSerialize ? "Match! Strings are identical." : "Mismatch!");

      $("#string").text(decodeURIComponent(fromSerialize));

    });

  </script>

</body>

</html>

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jQuery .serializeArray() — $.param equivalence (Try It)