React Native Login Template

A comprehensive React Native authentication template with Firebase, featuring modern UI components, secure token management, and rate limiting.

🚀 Features

• 🔐 Firebase Authentication - Complete email/password authentication
• 📱 Modern UI - Beautiful, accessible components with dark mode support
• 🔄 JWT Token Management - Automatic token refresh and secure storage
• 💾 Secure Storage - Cross-platform secure storage with AsyncStorage fallback
• 🚦 Rate Limiting - Built-in rate limiting with exponential backoff
• 📡 Context API - Global state management for authentication
• 🧭 React Navigation - Smooth navigation between auth and app flows
• ✨ TypeScript Ready - Fully typed for better development experience
• 🎨 Customizable - Easy to customize colors, fonts, and layouts

📁 Project Structure

src/
├── api/
│   └── firebase.js          # Firebase configuration and initialization
├── auth/
│   ├── AuthProvider.js      # Context provider for authentication state
│   ├── authActions.js       # Authentication actions (login, register, logout)
│   └── useAuth.js           # Custom hook for auth operations
├── components/
│   ├── CustomButton.js      # Reusable button component
│   └── CustomInput.js       # Reusable input component with validation
├── navigation/
│   ├── AppStack.js          # Navigation for authenticated users
│   ├── AuthStack.js         # Navigation for unauthenticated users
│   └── RootNavigator.js     # Main navigation controller
├── screens/
│   ├── HomeScreen.js        # Main app screen
│   ├── LoginScreen.js       # Login form
│   ├── ProfileScreen.js     # User profile and settings
│   └── RegisterScreen.js    # Registration form
├── utils/
│   ├── delay.js             # Rate limiting utilities
│   └── storage.js           # Secure storage utilities
└── App.js                   # Main app component

🛠 Setup

1. Install Dependencies

npm install
# or
yarn install

2. Firebase Setup

1. Create a new project at Firebase Console
2. Enable Authentication with Email/Password
3. Get your configuration from Project Settings
4. Copy env.example to .env
5. Fill in your Firebase configuration:

EXPO_PUBLIC_FIREBASE_API_KEY=your_api_key
EXPO_PUBLIC_FIREBASE_AUTH_DOMAIN=your_project.firebaseapp.com
EXPO_PUBLIC_FIREBASE_PROJECT_ID=your_project_id
EXPO_PUBLIC_FIREBASE_STORAGE_BUCKET=your_project.firebasestorage.app
EXPO_PUBLIC_FIREBASE_MESSAGING_SENDER_ID=your_sender_id
EXPO_PUBLIC_FIREBASE_APP_ID=your_app_id

3. Run the App

npm start
# or
yarn start

🔧 Configuration

Rate Limiting

Configure rate limiting in src/utils/delay.js:

const RATE_LIMIT_CONFIG = {
  MAX_LOGIN_ATTEMPTS: 5,
  MAX_REGISTER_ATTEMPTS: 3,
  LOGIN_COOLDOWN_MINUTES: 15,
  REGISTER_COOLDOWN_MINUTES: 5,
  BASE_DELAY_MS: 1000,
  MAX_DELAY_MS: 10000,
};

UI Customization

Colors and styling can be customized in each component's StyleSheet. Common colors used:

• Primary: #007AFF
• Secondary: #F2F2F7
• Success: #34C759
• Warning: #FF9500
• Error: #FF3B30
• Text: #1D1D1F
• Secondary Text: #8E8E93

📱 Usage

Authentication Hook

import { useAuth } from './src/auth/useAuth';

const MyComponent = () => {
  const {
    // State
    isAuthenticated,
    user,
    isLoading,
    error,
    
    // Actions
    login,
    register,
    logout,
    resetPassword,
    clearError,
    
    // Computed values
    userEmail,
    userId,
    userDisplayName,
    isEmailVerified,
  } = useAuth();

  return (
    // Your component JSX
  );
};

Custom Components

CustomButton

import CustomButton from './src/components/CustomButton';

<CustomButton
  title="Sign In"
  onPress={handleLogin}
  loading={isLoading}
  variant="primary" // primary, secondary, outline, text
  size="medium"     // small, medium, large
/>

CustomInput

import CustomInput from './src/components/CustomInput';

<CustomInput
  label="Email"
  placeholder="Enter your email"
  value={email}
  onChangeText={setEmail}
  keyboardType="email-address"
  error={emailError}
  required
/>

🔒 Security Features

• Secure Storage: Uses Expo SecureStore on mobile, AsyncStorage on web
• Token Management: Automatic JWT refresh and secure storage
• Rate Limiting: Prevents brute force attacks with exponential backoff
• Input Validation: Client-side validation for forms
• Error Handling: Comprehensive error handling with user-friendly messages

🚀 Deployment

Building for Production

# Build for iOS
expo build:ios

# Build for Android
expo build:android

# Or use EAS Build (recommended)
eas build --platform all

Environment Variables

Make sure to set up environment variables in your deployment platform:

• Vercel: Add to project settings
• Netlify: Add to build environment
• EAS: Use eas secret:create

🤝 Contributing

1. Fork the repository
2. Create your feature branch (git checkout -b feature/AmazingFeature)
3. Commit your changes (git commit -m 'Add some AmazingFeature')
4. Push to the branch (git push origin feature/AmazingFeature)
5. Open a Pull Request

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

🆘 Support

If you have any questions or run into issues:

1. Check the Issues page
2. Create a new issue with detailed information
3. Include device information, error messages, and steps to reproduce

🙏 Acknowledgments

• Expo for the amazing development platform
• Firebase for authentication services
• React Navigation for navigation
• The React Native community for inspiration and support

Built with ❤️ for the React Native community