OAuth 2.1: The Future of API Security
summary
OAuth 2.1 consolidates current best practices: only three grants remain — authorization code with PKCE, device authorization, and client credentials — while the implicit and password flows are removed. Tokens are short lived, delivered in headers or POST bodies, refresh tokens use rotation or sender-constraining and can be one‑time use, redirect URIs must match exactly, state is mandatory, and features like DPoP, JWT access tokens, and pushed or signed authorization requests are the concrete protections being adopted.
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chapters (10)
- 0:00OAuth 2.1 and API security
- 1:32OAuth 2.0 fundamentals
- 6:30Token management and refresh tokens
- 8:21Key OAuth 2.0 extensions
- 9:22PKCE explained
- 11:49Device authorization flow
- 13:34OAuth 2.0 security best practices
- 19:36OAuth 2.1 best practices
- 22:27Emerging OAuth security
- 24:15Adopt OAuth 2.1
