FB.api(
      "/1493689654199431/insights/page_impressions/lifetime",
      function (response) {
        if (response && !response.error) {
          console.log(response);
        }
      }
  );

{
  "data": [
  ],
  "paging": {
    "previous": "https://graph.facebook.com/v2.6/1493689654199431/insights/page_impressions/lifetime?access_token=EAACEdEose0cBAGNO4tT95osm9KIaLlsoxoWPyk7g4J6m3iBwa5ZArxGEZBbeIpILExuTZAC6KFRHfCuccbsOCCQLmRZCItZAAmTs3PXzueCCJ0CVjr6UBB3gZCfClQeeI1PbHZCnJVqZBPHf00Vl6U4Lj6B1FpMhZAqUSdXNvcPDWlAZDZD&debug=all&format=json&method=get&pretty=0&suppress_http_code=1&since=1462194002&until=1462453202",
    "next": "https://graph.facebook.com/v2.6/1493689654199431/insights/page_impressions/lifetime?access_token=EAACEdEose0cBAGNO4tT95osm9KIaLlsoxoWPyk7g4J6m3iBwa5ZArxGEZBbeIpILExuTZAC6KFRHfCuccbsOCCQLmRZCItZAAmTs3PXzueCCJ0CVjr6UBB3gZCfClQeeI1PbHZCnJVqZBPHf00Vl6U4Lj6B1FpMhZAqUSdXNvcPDWlAZDZD&debug=all&format=json&method=get&pretty=0&suppress_http_code=1&since=1462712402&until=1462971602"
  }
}

FB.api(
    "/1493689654199431/insights/page_impressions/lifetime",
    {access_token: pageToken},
    function (response) {
        if (response && !response.error) {
            console.log(response);
        }
    }
);

FB.api('/page-id/insights/page_impressions/days_28',{access_token: page-access-token}, function(response){
    console.log('page impressions',response);
})