This module does not do any thing by its own but adds a filter which theme developers ca use to decode a JSON data as an array. This module takes a JSON data as input and returns JSON decoded value as an array.
An example code code be:

{% for item in data | decode_json %}
  <div class="reqinfoitem">
    <span class="reqlableinfo">{{ item.label }} : </span>
    <span class="reqinputinfo">{{ item.answer }}</span>
  </div><!--end reqinfoitem-->
{% endfor %}