Category archive example with jekyll-archives

jekyll_category_archive.html

{%- for page in site.archives -%}
    {%- if page.type == 'category' -%}
        <h2>{{ page.title }}</h2>
        <ul class="posts">
            {%- assign date_format = site.date_format | default: "%b %-d, %Y" -%}
            {%- for post in page.posts -%}
                <li>
                    <span class="post-date">{{ post.date | date: date_format }}</span>
                    <a href="{{ post.url | relative_url }}" class="post-link">{{ post.title }}</a>
                </li>
            {%- endfor -%}
        </ul>
    {%- endif -%}
{%- endfor -%}