Is User Logged In

// Initialize provider
import Fortmatic from 'fortmatic';
import Web3 from 'web3';
const fm = new Fortmatic('YOUR_API_KEY');
window.web3 = new Web3(fm.getProvider());
let isUserLoggedIn = await fm.user.isLoggedIn();
console.log(isUserLoggedIn); // false
fm.user.login().then(() => {
isUserLoggedIn = await fm.user.isLoggedIn();
console.log(isUserLoggedIn); // true
});

You may get a user's Fortmatic id and email by calling fm.user.getUser()

let isUserLoggedIn = await fm.user.isLoggedIn(); // false
let userData = await fm.user.getUser();
// {
// id: null
// email: null
// }
fm.user.login().then(() => {
userData = await fm.user.getUser();
// {
// id: 'FORTMATIC_USER_ID'
// email: 'example@fortmatic.com'
// }
});