Directory Illustration for Flutter BLoC Projects

This folder structure illustrates a modular organization for a Flutter project following the BLoC (Business Logic Component) pattern, which is commonly used to manage and separate the different layers of an application’s logic and UI. In this structure, folders such as blocs, models, repositories, services, views, utils, and config each serve a specific role within the app.

The blocs folder holds the business logic of the application. Each feature or screen’s BLoC has its own folder to keep the logic, events, and states related to that feature in one place. This modular approach helps maintain separation of concerns and improves scalability. models contain data structures used throughout the app, while repositories are responsible for managing and centralizing data access, such as retrieving data from APIs or databases. services are utility classes that handle specific functions, like network requests or storage.

The views folder contains the visual components and user interfaces, typically divided into screens for full pages and widgets for reusable components, allowing a clear distinction between different UI layers. Utility functions and constants are organized within utils and config, respectively, providing a centralized space for commonly used elements and configuration data.

Illustrating this structure helps developers understand the clear separation and purpose of each folder, promoting a modular and maintainable codebase. As the project grows, this structure simplifies navigation, debugging, and scaling, allowing developers to quickly identify where different parts of the application logic and UI components are located.

lib/
├── blocs/                   # Business logic layer
│   └── example_bloc/        
│       ├── example_bloc.dart
│       ├── example_event.dart
│       └── example_state.dart
│
├── models/                  # Data models
│   └── example_model.dart
│
├── repositories/            # Data repositories
│   └── example_repository.dart
│
├── services/                # API, local storage, or other services
│   └── example_service.dart
│
├── views/                   # UI layer
│   ├── screens/             # Screens for each app page
│   │   └── example_screen.dart
│   └── widgets/             # Reusable widgets
│       └── example_widget.dart
│
├── utils/                   # Utility classes or functions
│   └── example_utils.dart
│
├── config/                  # Configurations and constants
│   └── app_constants.dart
│
└── main.dart                # App entry point