customize sweetalert2 outputting raw json

I want to display a sweetalert message if registration is successful or fail (I wrote the sweetalert code in a jquery file) and included it inside the registration view page but instead of displaying the sweetalert error or success message, it keeps displaying parsed json format message.

These are the files are created. custom_file.js

$(document).ready(function () {

    var form = $('#registration');

    form.submit(function (e) {
        e.preventDefault();

        $.ajax({
                url: form.attr('action'),
                type: "POST",
                data: form.serialize(),
                dataType: "json"
            })
            .done(function (response) {
                if (response.success) {
                    swal({
                        title: "Hi " + response.name,
                        text: response.success,
                        timer: 5000,
                        showConfirmButton: false,
                        type: "success"
                    });

                    window.location.replace(response.url);

                } else {
                    swal("Oops!", response.errors, 'error');
                }
            })
            .fail(function () {
                swal("Fail!", "Cannot register now!", 'error');
            });
    });

the registraion.blade.php file

@extends('layouts.app')

@section('content')
    <div class="container">
        <div class="row">
            <div class="col-md-8 col-md-offset-2">
                <div class="panel panel-default">
                    <div class="panel-heading">AJAX Register</div>
                    <div class="panel-body">
                        <form class="form-horizontal" id="registration" method="POST" action="" data-parsley-validate="">
                            {!! csrf_field() !!}

                            <div class="form-group">
                                <label class="col-md-4 control-label">Name</label>

                                <div class="col-md-6">
                                    <input type="text" class="form-control" name="name" id="name" required="">
                                </div>
                            </div>

                            <div class="form-group">
                                <label class="col-md-4 control-label">E-Mail Address</label>

                                <div class="col-md-6">
                                    <input type="email" class="form-control" name="email" id="email" required="">

                                </div>
                            </div>

                            <div class="form-group">
                                <label class="col-md-4 control-label">Password</label>

                                <div class="col-md-6">
                                    <input type="password" class="form-control" name="password" id="password" required="">

                                </div>
                            </div>

                            <div class="form-group">
                                <label class="col-md-4 control-label">Confirm Password</label>

                                <div class="col-md-6">
                                    <input type="password" class="form-control" name="password_confirmation" id="password_confirmation" data-parsley-equalto="#password" required="">
                                </div>
                            </div>

                            <div class="form-group">
                                <div class="col-md-6 col-md-offset-4">
                                    <button type="submit" class="btn btn-primary ladda-button" data-style="expand-left" data-size="s" data-color="green">
                                        <i class="fa fa-btn fa-user"></i> Register
                                    </button>
                                    <a href="{!! asset('login/facebook') !!}"> <div class="btn btn-md btn-primary ladda-button" data-style="expand-left" data-size="s" data-color="blue"> <i class="fa fa-facebook"></i> Login with Facebook </div></a>
                                </div>
                            </div>
                        </form>
                    </div>
                </div>
            </div>
        </div>
    </div>
@endsection

and this is the RegisterController.php script

public function postRegister(Request $request)
    {

        $validator = Validator::make($request->all(), [
            'email' => 'required|email|unique:users,email',
            'name' => 'required|min:2',
            'password' => 'required|alphaNum|min:6|same:password_confirmation',
        ]);

        if ($validator->fails()) {
            $message = ['errors' => $validator->messages()->all()];
            $response = Response::json($message, 202);
        } else {

            // Create a new user

            $user = new User([
                'name' => $request->name,
                'email' => $request->email,
                'password' => $request->password,
                'facebook_id' => $request->email
            ]);
            $user->save();

            Auth::login($user);

            $message = ['success' => 'Thank you for joining us!', 'url' => '/', 'name' => $request->name];
            $response = Response::json($message, 200);
        }
        return $response;
    }

}

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