How to Implement Authorization Code Flow with PKCE in a Single Page Application (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. ...