“How to migrate GetIt to Bloc?”<\/strong> Trust me \u2014 I searched the same things.<\/p>\n My first Flutter project wasn\u2019t big. I built it fast using GetIt because dependency injection felt clean and effortless. But as the project grew, something changed \u2014 the state became harder to track, debugging felt unpredictable, and suddenly my widget tree held too much logic.<\/p>\n That’s when I knew it was time to migrate GetIt to Bloc<\/strong>.<\/p>\n This guide is everything I wish I knew before starting the migration.<\/p>\n Before you start refactoring, you should ask:<\/p>\n Why do I want to migrate GetIt to Bloc?<\/p>\n<\/blockquote>\n For me \u2014 the answer was:<\/p>\n I needed predictable state behavior<\/strong><\/p>\n<\/li>\n I wanted clearer event \u2192 state \u2192 UI flow<\/strong><\/p>\n<\/li>\n I needed better scalability and testing<\/strong><\/p>\n<\/li>\n Multiple screens were sharing state and things felt messy<\/p>\n<\/li>\n<\/ul>\n \ud83d\udc4d You should<\/em> migrate if:<\/p>\n The project is growing or becoming long-term<\/p>\n<\/li>\n Multiple screens need shared state<\/p>\n<\/li>\n You want cleaner business logic separation<\/p>\n<\/li>\n You need robust unit testing<\/p>\n<\/li>\n<\/ul>\n \ud83d\udc4e You should NOT<\/em> migrate if:<\/p>\n The app is small and static<\/p>\n<\/li>\n No shared\/global state exists<\/p>\n<\/li>\n GetIt already works perfectly for your use case<\/p>\n<\/li>\n<\/ul>\n Migration should solve a problem \u2014 not create one.<\/p>\n Before removing anything, list what GetIt currently handles.<\/p>\n For example, in one of my projects, I had:<\/p>\n GetIt makes it easy to write this:<\/p>\n But the problem? Don\u2019t migrate the entire app at once.<\/p>\n Start with something simple \u2014 like theme switching.<\/p>\n Why theme? touches the UI<\/p>\n<\/li>\n requires state sharing<\/p>\n<\/li>\n is easy to test<\/p>\n<\/li>\n<\/ul>\n This will help you validate the flow before migrating more complex features like authentication.<\/p>\n Instead of throwing everything into one giant Bloc, break things down:<\/p>\n AuthBloc<\/strong><\/p>\n<\/li>\n ThemeBloc<\/strong><\/p>\n<\/li>\n UserBloc<\/strong><\/p>\n<\/li>\n SettingsBloc<\/strong><\/p>\n<\/li>\n<\/ul>\n Each Bloc handles one responsibility. <\/p>\n <\/p>\n Let\u2019s look at a real example.<\/p>\n Notice how:<\/p>\n UI triggers business logic<\/p>\n<\/li>\n Service updates state<\/p>\n<\/li>\n UI updates manually<\/p>\n<\/li>\n<\/ul>\n We first create a Bloc:<\/p>\n Now the UI becomes clean and reactive:<\/p>\n No more This is what migrating GetIt to Bloc feels like \u2014 structured, predictable, and scalable.<\/p>\n We now use At this stage, GetIt still exists \u2014 and that’s okay. Once all features move to Bloc, you can decide:<\/p>\n Keep GetIt ONLY for dependency injection Remove GetIt entirely if Bloc + Repository pattern feels enough<\/p>\n<\/li>\n<\/ul>\n In my case, removing GetIt fully made the project feel clean \u2014 but this depends on your architecture preferences.<\/p>\n Migrating a Flutter app is not just moving code \u2014 it\u2019s improving how the app thinks and behaves.<\/p>\n If you’re ready to scale, test, and build long-term maintainable apps, then migrating GetIt to Bloc<\/strong> is one of the best decisions you\u2019ll make as a Flutter developer.<\/p>\n And when you finally delete that last Want to learn Flutter Course<\/a>, Javascript<\/a>, or React Js Course<\/a>,\u00a0Frontend Development Course<\/a>,\u00a0Full Stack Development Course<\/a>\u00a0and More, Visit Our Website\u00a0www.kaashivinfotech.com.<\/a><\/p>\n
“Is it worth moving from GetIt to Bloc?”<\/strong>
“Should I refactor my existing Flutter app to Bloc?”<\/strong><\/p>\n<\/blockquote>\n![\"\"](\"https:\/\/www.kaashivinfotech.com\/blog\/wp-content\/uploads\/2025\/11\/Flutter-web-app.webp\")
<\/p>\n\ud83e\udded Why Migrate GetIt to Bloc?<\/h2>\n
\n
\n
\ud83d\udea6 When Bloc Makes Sense<\/h3>\n
\n
\n
![\"\"](\"https:\/\/www.kaashivinfotech.com\/blog\/wp-content\/uploads\/2025\/11\/migrate-flutter-application.webp\")
<\/p>\nStep 1 \u2014 Identify What GetIt Manages<\/h2>\n
- ThemeService\r\n- AuthService\r\n- ApiClient\r\n- UserPreferences\r\n- CartService\r\n<\/pre>\n
final locator = GetIt.instance;\r\n\r\nvoid setupLocator() {\r\n locator.registerSingleton<ThemeService>(ThemeService());\r\n}\r\n<\/pre>\n
Services contain logic<\/strong>, and widgets eventually rely on them directly. Which means UI + logic blend together \u2014 and that\u2019s not ideal long-term.<\/p>\n![\"\"](\"https:\/\/www.kaashivinfotech.com\/blog\/wp-content\/uploads\/2025\/11\/flutter-getit.webp\")
<\/p>\nStep 2 \u2014 Choose Which Feature to Convert First<\/h2>\n
Because it:<\/p>\n\n
\n
Bloc embraces the Single Responsibility Principle<\/strong> \u2014 something GetIt doesn\u2019t enforce.<\/p>\nStep 3 \u2014 Before & After (GetIt \u2192 Bloc)<\/h2>\n
![\"\"](\"https:\/\/www.kaashivinfotech.com\/blog\/wp-content\/uploads\/2025\/11\/state-management-in-flutter.webp\")
<\/p>\n\ud83e\uddf5 Before: Using GetIt + setState<\/h3>\n
final themeService = GetIt.instance<ThemeService>();\r\n\r\nclass SettingsPage extends StatefulWidget {\r\n @override\r\n _SettingsPageState createState() => _SettingsPageState();\r\n}\r\n\r\nclass _SettingsPageState extends State<SettingsPage> {\r\n bool isDark = themeService.isDarkMode;\r\n\r\n void toggleTheme() {\r\n themeService.toggleTheme();\r\n setState(() {\r\n isDark = themeService.isDarkMode;\r\n });\r\n }\r\n\r\n @override\r\n Widget build(BuildContext context) {\r\n return Switch(value: isDark, onChanged: (_) => toggleTheme());\r\n }\r\n}\r\n<\/pre>\n\n
After: Using Bloc<\/h3>\n
class ThemeEvent {}\r\n\r\nclass ToggleThemeEvent extends ThemeEvent {}\r\n\r\nclass ThemeState {\r\n final bool isDark;\r\n ThemeState(this.isDark);\r\n}\r\n\r\nclass ThemeBloc extends Bloc<ThemeEvent, ThemeState> {\r\n final ThemeService themeService;\r\n\r\n ThemeBloc(this.themeService) : super(ThemeState(themeService.isDarkMode)) {\r\n on<ToggleThemeEvent>((event, emit) {\r\n themeService.toggleTheme();\r\n emit(ThemeState(themeService.isDarkMode));\r\n });\r\n }\r\n}\r\n<\/pre>\nBlocBuilder<ThemeBloc, ThemeState>(\r\n builder: (context, state) {\r\n return Switch(\r\n value: state.isDark,\r\n onChanged: (_) => context.read<ThemeBloc>().add(ToggleThemeEvent()),\r\n );\r\n },\r\n);\r\n<\/pre>\nsetState()<\/code>.
No direct service call in widgets.
UI reacts automatically.<\/p>\nStep 4 \u2014 Inject Blocs at the App Level<\/h2>\n
![\"\"](\"https:\/\/www.kaashivinfotech.com\/blog\/wp-content\/uploads\/2025\/11\/getit-to-bloc.webp\")
<\/p>\nMultiBlocProvider<\/code>:<\/p>\nvoid main() {\r\n setupLocator();\r\n\r\n runApp(\r\n MultiBlocProvider(\r\n providers: [\r\n BlocProvider(\r\n create: (_) => ThemeBloc(locator<ThemeService>()),\r\n ),\r\n ],\r\n child: const MyApp(),\r\n ),\r\n );\r\n}\r\n<\/pre>\n
Migration happens feature-by-feature.<\/p>\nStep 5 \u2014 Slowly Remove GetIt (When Ready)<\/h2>\n
\n
or<\/strong><\/p>\n<\/li>\n\ud83d\udca1 Common Mistakes<\/h2>\n
\n\n
\n \nMistake<\/th>\n Fix<\/th>\n<\/tr>\n<\/thead>\n \n Migrating everything at once<\/td>\n Do it feature by feature<\/td>\n<\/tr>\n \n Keeping logic in widgets<\/td>\n Move to Bloc<\/td>\n<\/tr>\n \n One giant Bloc managing everything<\/td>\n Create multiple feature Blocs<\/td>\n<\/tr>\n \n Not writing tests<\/td>\n Bloc makes testing easy \u2014 use it<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n \ud83c\udfaf Final Thoughts<\/h2>\n
GetIt.instance<\/code>, trust me\u2026
you\u2019ll feel like you just cleaned your entire room at 2 AM while listening to nostalgic songs. \ud83d\ude05\u2728<\/p>\nRelated Reads:<\/h2>\n