This post was heavily inspired more or less copied from Joe Kampschmidt’s post How to list your jekyll posts by tags.

In his post, Joe shows how to create a list of posts sorted by the tags which they appear in. I wanted to achieve the same but instead listing by category rather than tag. I prefer categories as they are added into the URL when generating your site which I think is better for organisation (see here for the differences).

  {% for category in site.categories %}
    {% assign category_name = category | first %}
    {% assign posts = category | last %}

    {{ category_name | capitalize }}
      {% for post in posts %}
        {% if post.categories contains category_name %}
            <a href="{{ post.url }}">{{ post.title }}</a>
            <span class="date">{{ | date: "%B, %Y"  }}</span>
        {% endif %}
      {% endfor %}
  {% endfor %}