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<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="utf-8">

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

  <style>

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

    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: 14px; }

  </style>

</head>

<body>

  <button type="button" id="run">POST as JSON</button>

  <div class="log" id="json-out">—</div>

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

  <script>

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

      $.post("https://jsonplaceholder.typicode.com/posts", {

        title: "Hello",

        body: "World",

        userId: 1

      }, function(data) {

        $("#json-out").text("id=" + data.id + ", title=" + data.title + " (typeof data: " + typeof data + ")");

      }, "json");

    });

  </script>

</body>

</html>

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jQuery.post() — dataType json (Try It)