There are a few ways to manage token expired in MERN auth:

• Use a token expiration middleware: A token expiration middleware can be used to check the expiration date of the token before it is used. If the token is expired, the middleware will return an error.
• Use a refresh token: A refresh token is a token that can be used to get a new access token. If the access token expires, the user can use the refresh token to get a new access token.
• Use a token blacklist: A token blacklist is a list of tokens that have expired. If the token is in the blacklist, it will not be accepted.

No matter which approach you choose, it is important to manage token expired in MERN auth gracefully. This means that you should handle expired tokens in a way that does not disrupt the user experience.

Here are some additional tips for managing token expired in MERN auth:

• Set a reasonable expiration date for tokens: The expiration date for tokens should be long enough to allow users to complete their tasks without having to re-authenticate, but not so long that the token is likely to expire before the user needs it.
• Notify users when their token expires: This can help users to be prepared for the token to expire and to take steps to refresh the token before it expires.
• Allow users to refresh their tokens: This can help users to avoid getting locked out of their account if their token expires.