OpenID Connect (OIDC): Identity Layer Over Authorization

Stop misusing authorization for identity. It’s time to upgrade your authentication stack to OpenID Connect (OIDC). 🪙🔒

A common architectural anti-pattern is trying to use pure OAuth 2.0 access tokens to handle user registration and login profiles. OAuth is an authorization framework. If you want a secure, interoperable identity verification layer, you build on top of it with OIDC.

The Identity Protocol Architecture:
1️⃣ The OpenID Scope: By injecting scope: "openid profile", you transition the handshake from simple API access delegation to a formal identity claim request.
2️⃣ The ID Token Contract: The server responds with a signed JSON Web Token (JWT) called the ID Token. It contains cryptographically immutable identity parameters (sub for unique user identifier, iss for issuer validation, aud for application client ID).
3️⃣ Standardized Discovery: OIDC standardizes identity providers. Because of the /.well-known/ discovery specification, your microservices instantly know where to fetch public keys to verify incoming signatures. 🛠️🛡️

The Core Metric: Use OAuth 2.0 when your application needs a token to perform actions on a database or external API. Use OIDC when your application simply needs to know exactly who the logged-in user is.

👇 The Identity Dilemma: When verifying the OIDC ID Token in a high-concurrency microservice system, do you fetch the identity provider's JWKS (JSON Web Key Set) dynamically on every request or cache it locally with an expiration policy? Let’s talk architecture below! 👇
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