SPA

Single Page Applications (SPAs) face unique challenges when implementing OAuth 2.0 authorization flows due to their inability to securely store client secrets. The Authorization Code Flow with PKCE provides a secure, modern approach to handle user authentication and authorization in SPAs while protecting against common attacks such as code interception. Why Use Authorization Code Flow with PKCE for SPAs? Unlike the traditional Implicit Flow, which exposes access tokens directly in the browser URL and has been deprecated by many providers, Authorization Code Flow with PKCE shifts token exchanges to a secure backend or a secure client-side mechanism. PKCE ensures that authorization codes cannot be intercepted or reused by attackers. ...

OAuth 2.0 is a widely used authorization framework that allows applications to obtain limited access to user resources without handling user credentials directly. The Authorization Code Flow with PKCE (Proof Key for Code Exchange) is a security-enhanced version of the Authorization Code Flow, specifically designed to address vulnerabilities in public clients like mobile apps and single-page applications (SPAs) that cannot safely store a client secret. Why PKCE Is Needed Traditional Authorization Code Flow relies on a client_secret to authenticate the client when exchanging an authorization code for a token. In public clients (like browser apps or mobile apps), this secret cannot be safely stored. Without proper safeguards, attackers could intercept the authorization code during redirection and exchange it for tokens. ...