Authentication Mechanisms: JWT, OAuth, and Single Sign-On (SSO)

Introduction In modern application development, securing user authentication is a foundational requirement. As systems scale and threats become more sophisticated, choosing the right authentication and authorization strategy becomes critical. Three widely adopted approaches are JWT (JSON Web Token) , OAuth 2.0 , and Single Sign-On (SSO) . While often mentioned together, they solve different problems and are frequently used in combination. This article provides a clear, practical comparison along