How to get data from google analytics

Sorry about my english. I would like to get data from my Google Analytics. I show this api: https://developers.google.com/analytics/devguides/reporting/core/v4/

But I use the script and it doesn't return anything.

In my Google Analytics I have this:

I have a panel control with angular and html, and backend with sailsjs and nodejs, and I would like to show this data in my own panel control.

Like I say, I put this script in my html:

    <script>
  // Replace with your view ID.
  var VIEW_ID = 'XXXXXXXX';

  // Query the API and print the results to the page.
  function queryReports() {
    gapi.client.request({
      path: '/v4/reports:batchGet',
      root: 'https://analyticsreporting.googleapis.com/',
      method: 'POST',
      body: {
        reportRequests: [
          {
            viewId: VIEW_ID,
            dateRanges: [
              {
                startDate: '7daysAgo',
                endDate: 'today'
              }
            ],
            metrics: [
              {
                expression: 'ga:sessions'
              }
            ]
          }
        ]
      }
    }).then(displayResults, console.error.bind(console));
  }

  function displayResults(response) {
    var formattedJson = JSON.stringify(response.result, null, 2);
    document.getElementById('query-output').value = formattedJson;
  }
</script>

Thanks you!!

via oihi08