HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>$.param() nested</title>

  <style>

    body { font-family: sans-serif; padding: 16px; max-width: 560px; }

    button { padding: 8px 14px; cursor: pointer; background: #16a34a; color: #fff; border: none; border-radius: 6px; }

    .log { margin-top: 14px; padding: 12px; background: #f0fdf4; border-radius: 6px; font-size: 13px; word-break: break-all; }

    .label { font-weight: 600; color: #166534; margin-bottom: 4px; }

  </style>

</head>

<body>

  <button type="button" id="run">Serialize nested object</button>

  <div class="log">

    <div class="label">Encoded</div>

    <div id="encoded">—</div>

    <div class="label" style="margin-top:10px">Decoded</div>

    <div id="decoded">—</div>

  </div>

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

  <script>

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

      var myObject = {

        a: { one: 1, two: 2, three: 3 },

        b: [1, 2, 3]

      };

      var encoded = $.param(myObject);

      $("#encoded").text(encoded);

      $("#decoded").text(decodeURIComponent(encoded));

    });

  </script>

</body>

</html>

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jQuery.param() — nested recursive encoding (Try It)