Utility to count watchers in an AngularJS app. The higher the number of watchers, the slower your app will run.

ng-watcher-counter

/**
 * Utility to count watchers in an AngularJS app.
 */
 
function countWatchers() {
  var root = angular.element(document.getElementsByTagName('body'));
  var watchers = [];
 
  var f = function (element) {
    if (element.data().hasOwnProperty('$scope')) {
      angular.forEach(element.data().$scope.$$watchers, function(watcher) {
        watchers.push(watcher);
      });
    }
 
    angular.forEach(element.children(), function(childElement) {
      f(angular.element(childElement));
    });
  };
 
  f(root);
  console.log('watchers.length: ', watchers.length);
}
 
(function() {
  countWatchersTimeout = window.setTimeout(countWatchers, 10000);
})();