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# Code Generation Assistance

## Requested Task
Generate boilerplate code for a user authentication system in React.js

## Generated Code
```javascript
// AuthenticationService.js

class AuthenticationService {
  constructor() {
    this.apiUrl = 'https://api.example.com/auth';
  }

  async login(email, password) {
    const response = await fetch(`${this.apiUrl}/login`, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
      },
      body: JSON.stringify({ email, password }),
    });
    return await response.json();
  }

  async register(email, password) {
    const response = await fetch(`${this.apiUrl}/register`, {
      method: 'POST',
      headers: {
        'Content-Type': 'application/json',
      },
      body: JSON.stringify({ email, password }),
    });
    return await response.json();
  }
}

// Usage Example
const authService = new AuthenticationService();
authService.login('user@example.com', 'password123')
  .then(data => console.log(data))
  .catch(error => console.error(error));
```

## Notes
- Ensure to replace the API URL with your actual backend endpoint
- Add error handling as per your application's requirements
- Consider adding token storage and retrieval logic