Here is a copy of the init config used for our api:

superTokens.init({
  supertokens:{
    connectionURI: "http://localhost:3567",
  },
  appInfo: {
    appName: 'My API',
    apiDomain: process.env.API_DOMAIN,
    websiteDomain: process.env.WEBSITE_DOMAIN
  },
  recipeList: [
    Session.init({
      sessionExpiredStatusCode: 440,
      disableDefaultImplementation: false,
  }) // initializes session features
  ]
});

On the server, I've made WEBSITE_DOMAIN http://localhost:8080 (my assumption here is that this url would represent my web app running locally)