I am trying to get the Kubernetes cluster details from google cloud using google cloud Kubernetes API for node js.

Below is the example i have found in google documentation.

var google = require('googleapis');
var container = google.container('v1');

authorize(function(authClient) {
  var request = {
     projectId: 'my-project-id',  
     zone: 'my-zone',  
     clusterId: 'my-cluster-id',  
     auth: authClient,
  };

  container.projects.zones.clusters.get(request, function(err, response){
    if (err) {
       console.error(err);
    return;
  }

// TODO: Change code below to process the `response` object and send the detail back to client.

  console.log(JSON.stringify(response, null, 2));
  });
});

function authorize(callback) {
   google.auth.getApplicationDefault(function(err, authClient) {
     if (err) {
       console.error('authentication failed: ', err);
       return;
   }
   if (authClient.createScopedRequired && authClient.createScopedRequired()) {
       var scopes = ['https://www.googleapis.com/auth/cloud-platform'];
       authClient = authClient.createScoped(scopes);
   }
   callback(authClient);
  });
}

As the google get API is asynchronous function, how can I return the response from API back to client.