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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>$.ajax() dataType json</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 560px; }
    button { margin-right: 8px; padding: 8px 14px; cursor: pointer; border: none; border-radius: 6px; color: #fff; }
    #ok { background: #16a34a; }
    #bad { background: #dc2626; }
    .log { margin-top: 14px; padding: 12px; background: #fefce8; border-radius: 6px; font-size: 13px; white-space: pre-wrap; }
  </style>
</head>
<body>
  <button type="button" id="ok">Valid JSON</button>
  <button type="button" id="bad">404 error</button>
  <div class="log">Try both buttons.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    function run(url) {
      $(".log").text("Sending…");
      $.ajax({ url: url, dataType: "json" })
        .done(function(data) { $(".log").append("\n✓ done: userId=" + data.userId); })
        .fail(function() { $(".log").append("\n✗ fail"); })
        .always(function() { $(".log").append("\n→ always (finished)"); });
    }
    $("#ok").on("click", function() { run("https://jsonplaceholder.typicode.com/posts/1"); });
    $("#bad").on("click", function() { run("https://httpbin.org/status/404"); });
  </script>
</body>
</html>

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jQuery.ajax() — dataType json + done/fail/always (Try It)