Posting data from ionic to wordpress

I’m working with ionic v1 and wordpress using the JSON API to get posts from the wordpress web site to my ionic app , now I want that any user can post something ( create a post) from the ionic app to the website , any help ? do I need to know something about authentification ? Thank you I tried this

    .controller('EmailCtrl', function ($scope, $http) {
    $scope.sendFeedback = function (params) {

            function () {

            }, function (err) {

and I got errors

ionic.bundle.js:25005 POST http://localhost/backend3/api/create_post/?nonce=14aa094055&title=add%tag&content=tagtagtag&&status=publish net::ERR_CONNECTION_REFUSED