HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

  <title>.serialize() $.post</title>

  <style>

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

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

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

    button { margin-top: 10px; 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; }

  </style>

</head>

<body>

  <form id="save-form" action="https://jsonplaceholder.typicode.com/posts">

    <label>Title <input type="text" name="title" value="Serialized post"></label>

    <label>Body <textarea name="body">Sent via .serialize()</textarea></label>

    <input type="hidden" name="userId" value="1">

    <button type="submit">Save via $.post()</button>

  </form>

  <div class="log" id="status">Submit to Ajax POST.</div>

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

  <script>

    $("#save-form").on("submit", function(event) {

      event.preventDefault();

      var $form = $(this);

      $("#status").text("Sending: " + $form.serialize());

      $.post($form.attr("action"), $form.serialize(), function(data) {

        $("#status").text("Saved! id=" + data.id + " — " + data.title);

      }, "json");

    });

  </script>

</body>

</html>

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jQuery .serialize() — $.post() Ajax submit (Try It)