Is it safe to save user role in JWT token with NextAuth?

It is generally safe to include the user's role in a JWT token with NextAuth, as long as the token is properly signed and encrypted to prevent tampering or unauthorized access. JWT tokens are designed to be self-contained and secure, and NextAuth takes steps to ensure that the tokens it generates are safe and secure. When using the JWT strategy, NextAuth automatically signs the token using a secret key, which ensures that the token can only be verified by someone who has access to the same key. This prevents attackers from tampering with the token or forging their own tokens. In addition, NextAuth allows you to encrypt the JWT token using a public/private key pair, which provides an additional layer of security. This ensures that even if an attacker were able to obtain a valid JWT token, they would not be able to read or modify the contents of the token without access to the private key. In general, it is safe to include the user's role in the JWT token as long as you are using a secure signing and encryption scheme, and you are careful to verify the token on the server side before granting access to protected resources. This will ensure that only authenticated users with the appropriate role can access the resources they are allowed to access.