Fetching all jekyll posts in a json

site.json

---
layout: null
---

[
  {% for post in site.posts %}
  {
    "title"     : "{{ post.title }}",
    "url"       : "{{ post.url }}",
    "date"      : "{{ post.date | date: "%B %d, %Y" }}",
    "content"   : "{{ post.content | strip | strip_html | strip_newlines | replace: '"', '' | slice: 0, 600 }}"
  }{% if forloop.last %}{% else %},{% endif %}
  {% endfor %}
]