How to access localstorage property in flutter windows app.

[rudraraj3004]

I received the error when data try to save on html side. Error = SecurityError: Failed to read the 'localStorage' property from 'Window': Access is denied for this document.

Here is my code

InAppWebView(
initialData: InAppWebViewInitialData(
data: widget.html,
encoding: 'utf-8',
mimeType: 'text/html',
baseUrl: WebUri("http://localhost:8080"),
),
initialSettings: _settings,
onWebViewCreated: (controller) async {
_appWebViewController = controller;
},
onLoadStop: (controller, url) async {
try {
await _loadAssets();

                String jsCode;

                if (Platform.isWindows) {
                  final jsonSignature = str_SignatureConfig;
                  final jsonUsername = jsonEncode(str_username);
                  final jsonUniqueID = jsonEncode(offline_uniqueNumber);

                  jsCode = '''
window.pumpermanifest_signature_config = $jsonSignature;
window.PumperName = $jsonUsername;
window.UniqueID = $jsonUniqueID;
console.log("✅ JS Config injected (Windows, no localStorage)");
if (typeof window.flutterDataReady === 'function') {
  window.flutterDataReady();
}

''';
} else {
jsCode = '''
localStorage.removeItem('pumpermanifest_signature_config');
localStorage.removeItem('PumperName');
localStorage.removeItem('UniqueID');

localStorage.setItem('pumpermanifest_signature_config', ${jsonEncode(str_SignatureConfig)});
localStorage.setItem('PumperName', ${jsonEncode(str_username)});
localStorage.setItem('UniqueID', ${jsonEncode(offline_uniqueNumber)});
console.log("✅ JS Config injected (Mobile/LocalStorage)");
if (typeof window.flutterDataReady === 'function') {
  window.flutterDataReady();
}

''';
}

                await _appWebViewController.evaluateJavascript(
                    source: jsCode);

                await controller.evaluateJavascript(
                    source: 'checkFlutterParams();');
              } catch (e) {
                debugPrint("❌ JS/CSS injection error: $e");
              }
            },
            onConsoleMessage: (controller, consoleMessage) {
              debugPrint("📢 JS: ${consoleMessage.message}");
            },
          )
          
          
          final InAppWebViewSettings _settings = InAppWebViewSettings(
javaScriptEnabled: true,
allowFileAccess: true,
domStorageEnabled: true,
allowUniversalAccessFromFileURLs: true,
allowFileAccessFromFileURLs: true,
javaScriptCanOpenWindowsAutomatically: true,
verticalScrollBarEnabled: true,
horizontalScrollBarEnabled: true,
clearCache: true,
useShouldInterceptAjaxRequest: true,
useShouldInterceptFetchRequest: true,
cacheEnabled: true,
geolocationEnabled: true,
safeBrowsingEnabled: true,

);