OAuth and JWT are both open standards that can form a core part of any SaaS application's authentication stack. While OAuth is an open standard for access delegation commonly used for both authentication and authorization, JWTs are compact tokens used for secure transmission of information between parties. For most scenarios, the combined approach works best: use OAuth for initial authentication and authorization, then issue that access token as a JWT. This provides the security and convenience of single sign-on with the flexibility of JWTs.