CORS problem resolve

server/server.js

@@ -20,6 +20,16 @@ const appPort = 3000;
 
 const app = express();
 app.use(express.json());
+app.use((req, res, next) => {
+    res.setHeader('Access-Control-Allow-Origin', '*');
+    res.setHeader('Access-Control-Allow-Headers', 'Content-Type');
+    res.setHeader('Access-Control-Allow-Methods', 'GET,POST,PUT,DELETE');
+    if (req.method === 'OPTIONS') {
+        res.sendStatus(204);
+        return;
+    }
+    next();
+});
 
 const adapter = new DBAdapter({
     dbHost: HOST,