Authorization code flow is an OAuth pattern in which a client first receives an authorization code and then exchanges it for tokens through a back-channel request. It matters because token exchange is safer when sensitive issuance happens over a more controlled channel.
What is Authorization Code Flow?
In this flow, the user authenticates and approves access through an authorization server, which returns a short-lived code to the client. The client then redeems that code for tokens, often with PKCE or client authentication depending on the client type.
What Authorization Code Flow Commonly Supports
Common uses include web applications, mobile sign-in, OIDC login, delegated SaaS access, and modern user-facing OAuth implementations.
Authorization Code Flow vs. Implicit Flow
Authorization code flow uses a code exchange step and is generally safer than older direct token-return approaches such as implicit flow.
Frequently Asked Questions
Why is authorization code flow important?
Because it is one of the most common and better-protected ways to implement modern delegated access.
Should it be used with PKCE?
Usually yes, especially for public clients and modern browser or mobile app deployments.
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