Twitch JavaScript

var executed = false;

setInterval(() => {
  $.ajax({
    type: 'GET',
    url: 'https://api.twitch.tv/helix/streams?user_login=username',
    dataType: 'json',
    headers: {
      'Client-Id': 'clientid',
      'Authorization': 'token'
    },
    success: function(channel) {
      if (channel["data"] == "") {
        executed = false;
      } else {
        if (!executed) {
          //do stuff
          executed = true;
        }
      }
    }
  });
}, 2000);