In Laravel 5.1 Can't post value of checkbox

I have 2 checkboxs inside a form, I can't post value of them. I have already tried this:

<div class="form-group col-md-4">
                <label class="col-md-6" for="invoiced">
                    <input type="checkbox" id="invoiced" value="false" name="project[invoiced]"> 
                     Invoiced </label>
                <label class="col-md-6" for="tobeinvoiced">
                    <input type="checkbox" id="tobeinvoiced" value="true" name="project[tobeinvoiced]" checked> 
                    To be Invoiced </label>
            </div>

with this script that changes the value of 2 checkboxes in true or false:

<script type="text/javascript">
            $('#tobeinvoiced').change(function(){
                cb = $(this);
                cb.val(cb.prop('checked'));
            });
            $('#invoiced').change(function(){
                cb = $(this);
                cb.val(cb.prop('checked'));
            });
            </script>

but when I submit, the values passed are set to null.

via Chebli Mohamed