usernameless.GetAssertion.js

document.getElementById('login').addEventListener('submit', function(event) {
    event.preventDefault();

    return getGetAssertionChallenge()
        .then((getAssertionChallenge) => {
            /*{
                "challenge": "Ld0vp5byLeFZBOpclgKP3BEc8AA4aBewYPlwbkgLh98",
                "status": "ok"
            }*/
            getAssertionChallenge = preformatGetAssertReq(getAssertionChallenge);
            return navigator.credentials.get({ 'publicKey': getAssertionChallenge })
        })
        .then((newCredentialInfo) => {
            newCredentialInfo = publicKeyCredentialToJSON(newCredentialInfo)

            return getAssertionResponse(newCredentialInfo)
        })
        .then((serverResponse) => {
            if(serverResponse.status !== 'ok')
                throw new Error('Error registering user! Server returned: ' + serverResponse.errorMessage);

            alert('Success!');
        })
        .catch((error) => {
            alert('FAIL' + error)
            console.log('FAIL', error)
        })
})