Update server.js

server.js

@@ -14,13 +14,28 @@ function generateRandomHex(length) {
 }
 
 const rand = (length) => 
-  [...Array(length)].map(() => (Math.random().toString(36)[2] || '0')).join('');
+  [...Array(length)].map(() => "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"[Math.floor(Math.random() * 62)]).join('');
+
+const deleteOldFiles = (folderPath, maxAgeMinutes = 10) => {
+  setInterval(() => {
+    fs.readdir(folderPath, (err, files) => {
+      if (err) return;
+      const now = Date.now(), maxAgeMs = maxAgeMinutes * 60 * 1000;
+      files.forEach(file => {
+        const filePath = path.join(folderPath, file);
+        fs.stat(filePath, (err, stats) => {
+          if (!err && now - stats.mtimeMs > maxAgeMs) fs.unlink(filePath, () => {});
+        });
+      });
+    });
+  }, 60000);
+};
 
+deleteOldFiles(tempDir, 5)
 app.use("/tmp", express.static(tempDir));
 
 app.all("/", async (req, res) => {
     const captcha = new CaptchaGenerator({ height: 200, width: 600 })
-      .setDimension(200, 6000)
       .setCaptcha({ text: rand(6) })
     const fileName = `temp_${generateRandomHex(8)}.png`;
     const filePath = path.join(tempDir, fileName);