# classes

- [ApiKeyRequiredException](/sdk-reference/justaname-core-sdk/classes/apikeyrequiredexception.md)
- [InvalidConfigurationException](/sdk-reference/justaname-core-sdk/classes/invalidconfigurationexception.md)
- [InvalidENSException](/sdk-reference/justaname-core-sdk/classes/invalidensexception.md)
- [InvalidSignInException](/sdk-reference/justaname-core-sdk/classes/invalidsigninexception.md)
- [JustaName](/sdk-reference/justaname-core-sdk/classes/justaname.md)
- [OffchainResolvers](/sdk-reference/justaname-core-sdk/classes/offchainresolvers.md)
- [SignIn](/sdk-reference/justaname-core-sdk/classes/signin.md)
- [SubnameChallenge](/sdk-reference/justaname-core-sdk/classes/subnamechallenge.md)
- [Subnames](/sdk-reference/justaname-core-sdk/classes/subnames.md)