fix-krishnaacharyaa#358: set json response limit

Author: rushil-b-patel

Diff for: backend/app.js

@@ -15,7 +15,7 @@ app.use(cors({
     origin: FRONTEND_URL,
     credentials: true
 }));
-app.use(express.json());
+app.use(express.json( { limit: '50kb' }));
 app.use(express.urlencoded());
 app.use(cookieParser());
 app.use(compression());