HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>ajaxPrefilter json scope</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; }
    #load-user { background: #16a34a; }
    #load-html { background: #64748b; }
    .log { margin-top: 14px; padding: 12px; background: #f0fdf4; border-radius: 6px; font-size: 14px; }
    .hint { color: #64748b; font-size: 13px; margin-top: 8px; }
  </style>
</head>
<body>
  <button type="button" id="load-user">JSON request</button>
  <button type="button" id="load-html">HTML request</button>
  <div class="log">Try both buttons — check the console.</div>
  <p class="hint">Only the JSON button triggers the scoped prefilter.</p>
  <script src="https://code.jquery.com/jquery-3.7.1.min.js"></script>
  <script>
    $.ajaxPrefilter("json", function(options) {
      console.log("JSON prefilter:", options.url);
    });

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

    $("#load-html").on("click", function() {
      $.ajax({
        url: "https://jsonplaceholder.typicode.com/posts/1",
        dataType: "html"
      }).done(function() {
        $(".log").text("HTML request — JSON prefilter was skipped");
      });
    });
  </script>
</body>
</html>

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jQuery.ajaxPrefilter() — JSON-scoped prefilter (Try It)