No Tokens in the Browser!

Use Duende Backend for Frontend (BFF) to manage tokens on the server to simplify your front-end development and increase security for Angular, React, Vue, and Blazor WASM apps. Host anywhere.

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Simplify Front-End Development, Increase App Security

The BFF Framework handles session management, token handling, and API proxying for browser-based applications. Your single page application (SPA) never sees a token, and your team doesn't have to build the plumbing from scratch.

Server-Side Sessions, Not Browser-Stored Tokens

Access and refresh tokens stay on the server. The browser holds a standard HTTP session cookie. Aligns with current OAuth 2.0 BCP guidance for browser-based apps.

API Proxying Built In

Call downstream APIs from your SPA through the BFF host. Token acquisition, refresh, and forwarding are handled for you.

Framework-Agnostic on the Client

Works with React, Angular, Vue, Blazor WebAssembly, or any JavaScript client. The BFF host is ASP.NET Core, the client is whatever you ship.

Versions

BFF v3.0 - Stable release. Supported for current IdentityServer deployments.
BFF v4.0 - Latest release, aligned with Duende IdentityServer v8.x. Recommended for new deployments.

Both versions are included as a capability of Duende IdentityServer on eligible tiers.