How can I detect if my Flutter app is running in the web?

There is a global boolean kIsWeb which can tell you whether or not the app was compiled to run on the web.

Documentation: https://api.flutter.dev/flutter/foundation/kIsWeb-constant.html

import 'package:flutter/foundation.dart' show kIsWeb;

if (kIsWeb) {
  // running on the web!
} else {
  // NOT running on the web! You can check for additional platforms here.
}

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