React JWT Authentication Tutorial

Implement JWT Login Flow

Create a React login form that authenticates a user and stores a JWT token securely.

Expected output: A working login form that stores the JWT token and allows access to protected routes.

Hint: Use fetch or axios to send credentials and store the token in HttpOnly cookies or localStorage.

Create a PrivateRoute Component

Build a PrivateRoute component that restricts access based on JWT token presence.

Expected output: Routes that redirect unauthenticated users to the login page.

Hint: Use React Router's Route and Redirect components.

Handle Token Expiration

Add logic to check JWT token expiration and log out users automatically.

Expected output: Users are logged out or prompted to re-login when the token expires.

Hint: Decode the token payload to read the expiration time.

A JWT is a JSON Web Token used to securely transmit information between parties. In React authentication, it enables stateless session management by encoding user identity and claims, allowing the client to prove authentication without server-side sessions.

You can create protected routes by checking for a valid JWT token before rendering components. If the token is missing or invalid, redirect users to the login page to prevent unauthorized access.

Storing JWT tokens in localStorage exposes them to XSS attacks. Using HttpOnly cookies is safer as they are inaccessible to JavaScript. Always use HTTPS and validate tokens on the server.