{% assign index = 0 %} {% assign tempindex = 0 %}posts_json=[

{%- for post in site.application-guidelines -%}
    {%- assign tempindex = forloop.index0 -%}
    {%- assign index = tempindex -%}
    {%- include post.json -%},
{%- endfor -%}

{%- for post in site.posts -%}

            {%- capture index -%} 
                    {{ tempindex | plus: forloop.index}}
            {%- endcapture -%}

    {%- include post.json -%},
{%- endfor -%}
{%- assign tempindex = index -%}

{%- for post in site.html_pages -%}

            {%- capture index -%} 
                    {{ tempindex | plus: forloop.index}}
            {%- endcapture -%}

    {%- include post.json -%}{% unless forloop.last %},{% endunless %}
{%- endfor -%}

]