Dynamic related posts in Siteleaf using JSON

related.json.liquid

{% capture json %}
{
  {% for tag in site.pages['blog'].taxonomy['tags'] %}
    "{{tag.slug}}":
    [{% for post in tag.posts limit:10 %}
    {
      "title":  {{post.title | json}},
      "url":  {{post.url | json}},
      "img":  {{post.assets.first.url | json}}
    }{% unless forloop.last %},{% endunless %}
    {% endfor %}]
  {% unless forloop.last %},{% endunless %}
  {% endfor %}
}
{% endcapture %}{{ json | strip_newlines | replace:'  ','' }}

@sskylar this is incredibly powerful. Thanks for the tip!