How do I implement logout functionality in my Express.js app using JWT?

How do I implement logout functionality in my Express.js app using JWT?

To implement logout functionality, you can simply delete the JWT from the client side. This can be done by removing it from local storage or cookies.

What if I want to invalidate the token on the server side?

You can maintain a blacklist of tokens on the server. When a user logs out, add their token to this blacklist.

How do I check if a token is blacklisted?

You can create middleware that checks incoming tokens against the blacklist before allowing access to protected routes.

Is there a way to set a token expiration?

Yes, when generating the JWT, you can set an expiration time using the 'expiresIn' option.