Hinaloe

This plugin allow your site’s comment form makes ajax — non move/reload when user (including both subscriber, normal viewer, and admins too) post comment!
Most themes supports this plugin, but if your theme’s <code>class_form</code> have not <code>comment-form</code>, this plugin non supported.
And this plugin only can use for Pure WordPress Comment form. 
so, its not able to be used with like Jetpack comment form and other original/outside comment system/form.
Feature
<ul>
<li>post comment with ajax</li>
<li>Lite — this plugin only using a little of jQuery feature to modify DOM, and very tiny js & PHP code.</li>
</ul>
Require
You have to install <a href="https://wordpress.org/plugins/rest-api/" rel="ugc">WP REST API v2</a> to use this plugin if your site is running on WP 4.4-4.6.

ajax Post Comment

Post comment form on frontend tobe ajax using WP REST API Version.2

Frankie Jarrett

Did you find this plugin helpful? Please consider <a href="https://wordpress.org/support/view/plugin-reviews/json-rest-api-force-ssl" rel="ugc">leaving a 5-star review</a>.
Note: This plugin requires the <a href="https://wordpress.org/plugins/json-rest-api/" rel="ugc">WP REST API (WP API)</a> plugin.
For site owners who want the WP REST API served over SSL always and forever.
All HTTP requests to the WP REST API will be 301 redirected to their HTTPS equivalent.
Also, don’t use this plugin unless you have an SSL certificate as your endpoints will break! 🙂
Development of this plugin is done <a href="https://github.com/fjarrett/json-rest-api-force-ssl" rel="nofollow ugc">on GitHub</a>. Pull requests welcome. Please see <a href="https://github.com/fjarrett/json-rest-api-force-ssl/issues" rel="nofollow ugc">issues reported</a> there before going to the plugin forum.

WP REST API Force SSL

Force WP REST API endpoints to only be served over HTTPS.

ajax Post Comment vs WP REST API Force SSL