Dev.to
6/19/2026

Understanding OIDC Authentication Flow Visually
Short summary
OpenID Connect is an identity layer on OAuth 2.0 enabling secure user authentication via external providers without password handling. The authorization code flow involves registering your app, redirecting users to the provider, validating tokens, and gracefully handling errors. Critical security practices include protecting client secrets, validating token signatures, using HTTPS, implementing CSRF protection, and monitoring suspicious activity.
- •OIDC extends OAuth 2.0 to provide standardized authentication and user profile retrieval
- •Authorization code flow requires registration, user consent, token exchange, and validation
- •Security essentials: protect secrets, validate tokens, use HTTPS, implement CSRF protection, monitor activity
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