A pure liquid JSONFeed for Jekyll.

feed.json

---
layout: none
---
{
  "version": "https://jsonfeed.org/version/1",
  "title": {{ site.title | jsonify }},
  "description": {{ site.description | jsonify }},
  "home_page_url": "{{ '/' | absolute_url }}",
  "feed_url": "{{ '/feed.json' | absolute_url }}",
  "favicon": "{{ '/favicon-32x32.png' | absolute_url }}",
  {% if site.author %}
   "author": {
      "name": {{ site.author.name | default: site.author | json }},
      {% if site.author.uri %}
      "url": {{ site.author.uri | json }}
      {% endif %}
  },
  {% endif %}
  "items": [
    {% assign posts = site.posts | where_exp: "post", "post.draft != true" %}
    {% for post in posts limit: 10 %}
    {
      "id": "{{ post.url | absolute_url }}",
      "url": "{{ post.url | absolute_url }}",
      "title": {{ post.title | smartify | strip_html | normalize_whitespace | jsonify}},
      "summary": {{ post.excerpt | smartify | normalize_whitespace | jsonify }},
      "content_html": {{ post.content | markdownify | jsonify }},
      "date_published": "{{ post.date | date_to_rfc822 }}"
    }{% unless forloop.last %},{% endunless %}
    {% endfor %}
  ]
}

Adding this to your site is simple. Just paste the contents of this gist into a file called feed.json, then provide a link that your users can put into their feed reader in the same place that your RSS feed is linked, or in the footer.