Laravel ajax returns undefined value

I have an dropdown that I want it to make dynamic. In my example, a service has many categories and a categories belongs to a specific service. When a dropdown service is selected. It will display only all the categories that belongs to that service in the second dropdown.

So here's what I have done so far.

In my fields.blade.php

<!-- Client Id Field -->
<div class="form-group col-sm-6">
    {!! Form::label('client_id', 'Client Name:') !!}
     {!! Form::select('client_id', $client, null, ['class' => 'form-control','required'])!!}
</div>

<!-- Service Id Field -->
<div class="form-group col-sm-6">
    {!! Form::label('service_id', 'Service:') !!}
     {!! Form::select('service_id', $services, null, ['class' => 'form-control','required'])!!}
</div>

In my JS script

$(function() {
            $('#service_id').change(function() {

                var url = '' + '/service/' + $(this).val() + '/categories/';

                $.get(url, function(data) {
                    var select = $('form select[name= category_id]');

                    select.empty();

                    $.each(data,function(key, value) {
                        select.append('<option value=' + value.id + '>' + value.name + '</option>');
                    });
                });
            });
        });

In my routes web.php

Route::group(['prefix' => 'encoder','namespace' => 'Encoder'], function () {
Route::get('service/{service}/categories', 'ServiceController@getCategories');
});

In my ServieController.php

public function getCategories($idService)
    {
        if(!is_numeric($idService)) abort(404);

        $service = Service::findOrFail($idService);
        return $service->categories->pluck('name', 'id');
    }

I think I am already fetching the right data because when a specific service has 2 categories. It returns me also 2, but the value is undefined in the dropdown.

Appreciate if someone could help. Thanks in advance.

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