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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ajaxSetup dataType json</title>
  <style>
    body { font-family: sans-serif; padding: 16px; max-width: 520px; }
    button { margin-right: 8px; padding: 8px 14px; cursor: pointer; border: none; border-radius: 6px; color: #fff; }
    #load-user { background: #16a34a; }
    #load-posts { background: #2563eb; }
    .log { margin-top: 14px; padding: 12px; background: #f0fdf4; border-radius: 6px; font-size: 14px; }
  </style>
</head>
<body>
  <button type="button" id="load-user">Load user</button>
  <button type="button" id="load-posts">Load posts</button>
  <div class="log">Both buttons use $.get() with inherited dataType.</div>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $.ajaxSetup({ dataType: "json" });

    $("#load-user").on("click", function() {
      $.get("https://jsonplaceholder.typicode.com/users/1")
        .done(function(user) { $(".log").text("User: " + user.name); });
    });

    $("#load-posts").on("click", function() {
      $.get("https://jsonplaceholder.typicode.com/posts")
        .done(function(posts) { $(".log").text(posts.length + " posts loaded"); });
    });
  </script>
</body>
</html>

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jQuery.ajaxSetup() — default dataType json (Try It)