JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://unpkg.com/prop-types@15.5.10/prop-types.js"></script>
<script src="https://unpkg.com/react@16/umd/react.development.js"></script>
<script src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>
<div id="container"></div>

Babel + JSX

class App extends Component{
    constructor(props){
        super(props);
        this.state = {
          token: '',
          curUser: '',
          loggedIn: false
        };
      }

    
    login = () => {
        const hash = window.location.hash
        .substring(1)
        .split('&')
        .reduce((initial, item) => {
        if (item) {
            var parts = item.split('=');
            initial[parts[0]] = decodeURIComponent(parts[1]);
        }
        return initial;
        }, {});
        window.location.hash = '';
    
        // Set token
        let _token = hash.access_token;
        localStorage.setItem('token', _token);
        const authEndpoint = 'https://accounts.spotify.com/authorize';
    
        //github redirect
        let gh = 'https://info340c-au18.github.io/stage-0-topic-proposal-creiland/';
    
        //localhost redirect
        let lh = 'http://localhost:3000/';
    
        // Replace with your app's client ID, redirect URI and desired scopes
        const clientId = '92862003d4af472994d471f9cb5695fd';
        const redirectUri = lh;
        const scopes = [
            'user-read-private',
            'user-read-email',
            'playlist-modify-public',
            'playlist-modify-private',
            'user-top-read'
        ];
    
        // If there is no token, redirect to Spotify authorization
        if (!_token) {
        window.location = `${authEndpoint}?client_id=${clientId}&redirect_uri=${redirectUri}&scope=${scopes.join('%20')}&response_type=token`;
            
        } else {
            //spotifyApi.setAccessToken(_token);
            localStorage.setItem('token', _token);
            this.setState({loggedIn: true});
            return _token;
        }
    }

    loginUser = () => {
        let tk = this.login();
        //this.setState({token:this.login()});
        //localStorage.setItem('token', localStorage.getItem('token'));
        localStorage.setItem('token', tk);
       ...