Connection Refused where I want to put my details - html

Question

I am making a test app on MEAN stack and whenever I try to update information in my database regarding the fields, Google chrome throws Connection refused to the Url where I am posting the stuff.
Code for the controller:
(function() {
angular.module('TimeSuck')
.controller('EditProfileController',['Upload','$scope','$state', '$http', function(Upload, $scope, $state, $http) {
$scope.user = localStorage['Userdata'] || undefined
$scope.$watch(function(){
return $scope.file
},function(){
$scope.upload($scope.file);
});
$scope.upload = function(file) {
if(file){
Upload.upload({
url:'api/profile/editPhoto',
method: 'POST',
data: {userId: $scope.user._id},
file: file
}).progress(function(event){
console.log("Uploaded");
}).success(function(data){
}).error(function(error){
console.log(error);
})
}
};
$scope.updateUsername = function() {
var request = {
userId: $scope.user[0]._id,
username: $scope.username
}
$http.post('api/profile/updateUsername', request).success(function(){
console.log("success");
}).error(function(error){
console.log(error);
})
}
$scope.updateBio = function() {
var request = {
userId: $scope.user[0]._id,
bio: $scope.bio
}
$http.post('api/profile/updateBio', request).success(function(){
console.log("success");
}).error(function(error){
console.log(error);
});
}
$scope.post = function() {
console.log("successfully Posted.");
}
and the code for the html is here:
<div class="jumbotron">
<div class="col-sm-8 col-sm-offset-2">
<div class="row"> <div class="button" ngf-select ng-model="file" name="file" ngf-pattern="'image/*'"
ngf-accept="'image/*'" >Select</div> </div>
<div class="row">
<input class="form-control" ng-model="username" ng-blur="updateUsername()">
</div>
<div class="row">
<textarea class="form-control" ng-model="Bio" ng-blur="updateBio()"> </textarea>
<button type="submit" ng-click="post()"> Post </button>
</div>
</div>
</div>