fix exp

app.js

@@ -58,7 +58,7 @@ app.post("/upload", upload.single("file"), (req, res) => {
 
     const filePath = req.file.filename;
     const expiresAt = Date.now() + EXPIRATION_TIME;
-    fileData[filePath] += expiresAt;
+    fileData[filePath] = expiresAt;
     fs.writeFile(META_FILE, JSON.stringify(fileData, null, 2), (err) => {
         if (err) console.error("Gagal menulis ke api.json:", err);
       });