HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

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

  <style>

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

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

    input { width: 100%; padding: 6px 8px; box-sizing: border-box; }

    button { margin-top: 10px; padding: 8px 14px; cursor: pointer; background: #2563eb; color: #fff; border: none; border-radius: 6px; }

    pre { margin-top: 14px; padding: 12px; background: #eff6ff; border-radius: 6px; font-size: 12px; overflow: auto; }

  </style>

</head>

<body>

  <form id="demo">

    <label>Username <input type="text" name="username" value="john"></label>

    <label>Email <input type="email" name="email" value="john@example.com"></label>

    <button type="submit">Serialize array</button>

  </form>

  <pre id="json-out">Submit to see array.</pre>

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

  <script>

    $("#demo").on("submit", function(event) {

      event.preventDefault();

      $("#json-out").text(JSON.stringify($(this).serializeArray(), null, 2));

    });

  </script>

</body>

</html>

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jQuery .serializeArray() — basic array on submit (Try It)