React Token Auth

The `react-token-auth` library, currently at version 2.3.8, offers a specialized solution for managing JWT `accessToken` and `refreshToken` pairs within React applications. Its primary function is to abstract the complexities of token storage (e.g., `localStorage` for web or custom async storage for React Native), synchronize the application's authentication state, and automatically handle token expiration and refreshing. A key feature is its `onUpdateToken` callback, which allows developers to integrate with their backend's token refresh endpoint, and its mechanism to prevent concurrent token update requests. While the author acknowledges that cookie-based sessions are generally preferred for web security, `react-token-auth` addresses specific use cases where client-side JWT storage is a requirement. The library provides a concise API including `createAuthProvider` to configure the system, `useAuth` to access the authentication state in components, and `authFetch` to automatically attach tokens to requests. The project appears actively maintained with regular updates and ships with TypeScript type definitions, making it suitable for modern React development practices.