Does Ktor have is own method for JWT generation or Should I use another library like java-jwt?

They have their own: https://ktor.io/servers/features/authentication/jwt.html

I thought that only contains authentication methods. It's quite confusing. I wonder if there are more detailed and beginner friendly documents.

If you google, you'll should find some tutorials about ktor and jwt.

I found some helpful materials but sadly not that many. Thank you.

Did you figure this one out? Did you have to use additional libraries?

No, you just need a dependency

implementation("io.ktor:ktor-auth-jwt:1.2.2")

. I found a sample project: https://github.com/AndreasVolkmann/ktor-auth-jwt-sample Check it out. Code size is small and JwtConfig.kt file in the repository is all you need. Thanks to Andreas Volkmann.

Thanks for the reply!