Building a Secure PKCE Flow with Kotlin and Spring Boot
Proof Key for Code Exchange (PKCE) has become a standard security enhancement to the OAuth 2.0 Authorization Code Flow—especially in public clients like mobile and single-page applications. But PKCE isn’t just for frontend apps. When combined with a stateless backend built with Kotlin and Spring Boot, it strengthens your security posture, particularly when you’re avoiding client secrets. This guide walks you through how to implement a secure PKCE flow using Kotlin and Spring Boot, including endpoint structure, code challenge generation, and token exchange. ...