.

mccs-it/thermal/public/index.html

@@ -12,8 +12,11 @@
     <script>
         document.getElementById('testPrintBtn').addEventListener('click', () => {
             fetch('/test-print', { method: 'POST' })
-                .then(response => response.json())
-                .then(data => alert(data.message))
+                .then(response => response.blob())
+                .then(blob => {
+                    const url = URL.createObjectURL(blob);
+                    window.open(url);
+                })
                 .catch(error => alert('Error: ' + error));
         });
     </script>