Update server.js

server.js

@@ -55,17 +55,11 @@ app.post('/login', async (_req, res) => {
     return res.status(500).json(out);
   }
 
-  const boundary = '---PNG_BOUNDARY';
-  res.set('Content-Type', `multipart/mixed; boundary=${boundary}`);
-
-  res.write(`--${boundary}\r\n`);
-  res.write('Content-Type: application/json\r\n\r\n');
-  res.write(JSON.stringify({ ok: true }) + '\r\n');
-
-  res.write(`--${boundary}\r\n`);
-  res.write('Content-Type: image/png\r\n\r\n');
-  res.write(out.png);
-  res.end(`\r\n--${boundary}--`);
+  const b64 = out.png.toString('base64');           // <-- encode once
+  res.json({
+    ok: true,
+    screenshot_b64: `data:image/png;base64,${b64}`, // or just b64
+  });
 });
 
 console.log('🛰️  Public URL will be:', HOSTNAME);