---
title: PKCE
sidebar_custom_props:
    termName: PKCE
    tags:
        - OAuth2/OIDC
    shortDescription: Proof Key for Code Exchange hardens the code flow.
    longDescription: Binds the authorization request to the token exchange using a one-time code verifier and a code challenge (typically `S256`). Prevents intercepted codes from being redeemed by attackers.
---