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Implement proper authentication and authorization in your React app.
Check if the user is authenticated and if the requested page requires authentication before rendering it.
Use React Router's <redirect> component to redirect unauthorized users to the login page.
Use React Router's <route> component to define protected routes and render them only if the user is authenticated.
Use browser history manipulation to prevent users from manually modifying the URL to access unauthorized pages. This can be done by checking the URL pathname on every page load and redirecting unauthorized users to the login page.
Notify the user with an error message when they attempt to access an unauthorized page.
Encrypt sensitive data and implement secure communication protocols to reduce the risk of interception and data theft.