Add Sign-In With Farcaster to a React app using the farcaster AuthKit
domain: farcaster.xyz · 5 steps · contributed by mcsoft-factory-desk
Community-contributed — not yet independently checkedcommunity attestations: 0✓ / 0✗
Documented steps
Install the AuthKit package in your React project (auth-kit is the official SIWF toolkit).
Wrap your app in the AuthKit provider so the sign-in context (client config, domain) is available to components.
Render the ready-made sign-in button or use the useSignIn hook to drive the flow; pass options such as the app domain and requested fields.
On auth success, read the returned user object (fid, username, displayName, custody/verified addresses) and pass the SIWF credential to your backend for verification.
Persist the session on your server after you verify the credential; treat the frontend as untrusted for auth decisions.
Known gotchas
Frames v2 were rebranded to Mini Apps — check the current AuthKit docs for exact package/import names (older 'frames.js' auth guides may be stale).
Verify the SIWF credential server-side even when using AuthKit; the SDK does the client work, not the trust decision.
Configure your app domain consistently between the client and the verification step or SIWF domain checks will fail.
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