fix atob()

src/components/RefreshTokenProvider.js

@@ -48,7 +48,18 @@ const RefreshTokenProvider = ({ children }) => {
   const checkTokenExpiry = useCallback(() => {
     // Check if token is present and its expiry time
     if (token.current) {
-      const tokenExp = JSON.parse(atob(token.current.split('.')[1])).exp;
+      let tokenExp;
+      try {
+        // JWT payload is base64url; atob needs standard base64
+        let payload = token.current.split('.')[1]
+          .replace(/-/g, '+')
+          .replace(/_/g, '/');
+        payload += '='.repeat((4 - (payload.length % 4)) % 4);
+        tokenExp = JSON.parse(atob(payload)).exp;
+      } catch (e) {
+        token.current = null;
+        return;
+      }
       const currentTime = Math.floor(Date.now() / 1000);
       const expiryTime = tokenExp - 30; // Refresh 30 seconds before expiry
     //   console.log("check refresh Token");