OAuth Authorization Server Setup: Implementation Guide & Configuration

This blog-style guide explains the core components and best practices for implementing an OAuth 2.0 / OpenID Connect authorization server, covering required endpoints (/authorize, /token, /introspect, /revoke, /jwks), client registration for public vs confidential apps, appropriate grant flows (authorization code with PKCE for mobile, client credentials for server-to-server), token validation strategies, and hardening measures like TLS, strong signing (RS256+), token revocation/blacklisting, and refresh token rotation.