json working

<!DOCTYPE html>
<html>
<head>
  <script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.10/angular.min.js"></script>
  <script src="https://d3js.org/d3.v3.min.js" charset="utf-8"></script>
</head>
<body ng-app="myApp" ng-controller="MainCtrl">
  <donut-chart data="donutData"></donut-chart>
  <script>
var myApp = angular.module('myApp', []);
var data;

myApp.controller('MainCtrl', function($scope, $http, $interval){
  $interval(function(){
    $http.get('data.json').then(function(response){
      // your API would presumably be sending new data, not the same
      // data each time!
      data = response.data
        .map(function(d){ return d  });
		
      $scope.donutData = data;
	  //console.log(data);
    }, function(err){
      throw err;
    });
  }, 1000);
});

myApp.directive('donutChart', function(){
  function link(scope, el, attr){
    var color = d3.scale.category10();
    var width = 800;
    var height = 800;
    var min = Math.min(width, height);
    var svg = d3.select(el[0]).append('svg');

svg.attr({width: width, height: height});

// center the donut chart
    var g = svg.append('g');
    
    // add the <path>s for each arc slice
    var arcs = g.selectAll('path');

scope.$watch('data', function(data){
      if(!data){ return; }
      arcs = arcs.data(data);
      arcs.exit().remove();
      arcs.enter().append('circle')
	  .attr("cx",function(d,i) {return 100+i*100;})
	  .attr("cy",function(d,i) {return 200;})
	  .attr("r",function(d,i) {return d.age;})
        .style('stroke', 'white')
        .attr('fill', function(d, i){ return color(3) });
    }, true);
  }
  return {
    link: link,
    restrict: 'E',
    scope: { data: '=' }
  };
});
  </script>
</body>
</html>

Modified http://d3js.org/d3.v3.min.js to a secure url

https://ajax.googleapis.com/ajax/libs/angularjs/1.2.10/angular.min.js

https://d3js.org/d3.v3.min.js