async fetch - SyntaxError: Unexpected token < in JSON at position 0

Question

I'm trying to make a ReactJS app that utilizes the Spotify API, but I keep receiving this error:

const client_id = ''; //hidden
const redirect_uri = 'http://localhost:3000/'
let accessToken;

const Spotify = {
    async getAccessToken(){
        if (accessToken){
            return accessToken;
        }

        try{
            let response = await fetch(`https://cors-anywhere.herokuapp.com/https://accounts.spotify.com/authorize?client_id=${client_id}&response_type=token&redirect_uri=${redirect_uri}`);
            if (response.ok){
                let jsonResponse = await response.json();
                console.log(jsonResponse);
            }
        }catch (e){
            console.log(e);
        }
    }
}

export default Spotify;

I've read around and I hear this is a server-side issue? If so, is there a work-around it? By the way I am using this https://cors-anywhere.herokuapp.com/ to prevent the CORS error.

Thanks for any help. I'll keep working on it. If I find anything, I'll post up the solution right away!