Spotify Client Credentials Auth using Fetch

How can I get the spotify api token using fetch?

The spotify website has an example like this:

var client_id = 'CLIENT_ID';
var client_secret = 'CLIENT_SECRET';

var authOptions = {
  url: 'https://accounts.spotify.com/api/token',
  headers: {
    'Authorization': 'Basic ' + (new Buffer(client_id + ':' + client_secret).toString('base64'))
  },
  form: {
    grant_type: 'client_credentials'
  },
  json: true
};

request.post(authOptions, function(error, response, body) {
  if (!error && response.statusCode === 200) {
    var token = body.access_token;
  }
});

Can that be translated into fetch? If yes, how?

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