Update OAuth2-Backend-Approach.md

OAuth2-Backend-Approach.md

@@ -245,7 +245,7 @@ curl -X GET "https://www.googleapis.com/oauth2/v3/userinfo" \
 }
 ```
 
-### Frontend Code
+### Frontend Dashboard Code
 
 ```js
 import { useEffect, useState } from 'react';
@@ -301,3 +301,24 @@ function DashboardPage() {
 }
 ```
 
+### Backend Dashboard
+
+```js
+app.get('/api/dashboard-data', (req, res) => {
+  // The auth cookie is automatically included in req.cookies
+  const authToken = req.cookies.auth_token;
+  
+  if (!authToken) {
+    return res.status(401).json({ error: 'Not authenticated' });
+  }
+
+  // Verify the token and get data in one go
+  try {
+    // verify token...
+    // get dashboard data...
+    res.json({ dashboardData: 'your data here' });
+  } catch (err) {
+    res.status(401).json({ error: 'Invalid token' });
+  }
+});
+```