Understanding OpenID Connect: The Authorization Code Flow for Secure Login

Implementing secure user authentication is critical for modern web applications, yet understanding how identity protocols work behind the scenes can be challenging. This text-based course demystifies the OpenID Connect (OIDC) Authorization Code Flow, breaking down complex exchange patterns into readable, step-by-step explanations. You will transition from a basic understanding of web requests to confidently tracing and implementing secure authentication flows. What you'll learn: - Understand foundational identity concepts, distinguishing between OAuth 2.0 authorization and OpenID Connect authentication. - Trace the complete step-by-step journey of the Authorization Code Flow from the initial redirect to the final token exchange. - Configure scopes and claims to request specific user profile information securely. - Apply Proof Key for Code Exchange (PKCE) to protect your flows against interception attacks. - Validate ID tokens and access tokens to ensure payload integrity and authenticity. - Retrieve user details safely using the standard UserInfo endpoint. The course begins with core terminology and protocol basics, then guides you through the detailed request-response cycles, and concludes with modern security enhancements. It is designed for beginner developers and security enthusiasts with no prior experience in identity protocols. Start reading today to master the backbone of modern web security.