How to get FedCM API working on localhost?

Question

I am working with fedcm api for authentication. I am using this

if ('IdentityCredential' in window) {
    // AJAX call to login
    navigator.login.setStatus('logged-in');


    // TODO handle user canceling
    const credential = await navigator.credentials.get({
        identity: {
            // Specify the IdP (or multiple IdPs, supported from Chrome 136) this Relying Party supports
            providers: [
                {
                    configURL: 'https://accounts.google.com/gsi/fedcm.json',        
                    clientId: '<my-client-id>',
                    nonce: crypto.randomUUID() 
                }
            ]
        }
    });
    console.log(credential);
}

and the client id has 2 URL's in the authorized JS domains. One is a public https server i am running. When I test this there, it works ok and I get the credential. But when I run this on localhost:3000, and I have http://localhost:3000 in the authorized JS domain, i still get

The fetch of the id assertion endpoint resulted in a network error: ERR_FAILED
localhost/:1 Server did not send the correct CORS headers.
main.js:26 Uncaught (in promise) IdentityCredential
Error: Error retrieving a token.

how do I get this to work?

Check if your client config contains both http://localhost and http://localhost:3000, and that your referrer policy is set correctly - stackoverflow.com/a/78494068/1427878 — C3roe
– C3roe, Commented May 27 at 9:36

Zeta · Accepted Answer · 2025-06-09 09:17:03Z

0

If it works in a different enviroment but not in localhost may be due to chrome configuration that is not allowing pop-ups from localhost.

Try navigating to chrome://settings/content/federatedIdentityApi and enabling Third-party sign-in

answered Jun 9 at 9:17

Zeta

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