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

Pete Nelson

WordPress plugin to log <a href="http://v2.wp-api.org/" rel="nofollow ugc">REST API</a> requests and responses (for v2 of the API).
Includes:
<ul>
<li>WordPress admin page to view and search log entries</li>
<li>API endpoint to access log entries via JSON</li>
<li>Filters to customize logging</li>
<li>Custom endpoint logging</li>
<li>ElasticPress logging</li>
</ul>
Find us on <a href="https://github.com/petenelson/wp-rest-api-log" rel="nofollow ugc">GitHub</a>!
Roadmap
<ul>
<li>Better search capabilities for log entries via the REST API endpoint</li>
</ul>

REST API Log

Exactly what I needed

its trash.
whilst i do like the idea of the plugin, this tool is simply not working properly. guess it's abandoned. 
there is a filter build in to filter for the request type, but it does not work (simply doesn't filter at all). and there is an option, to purge logs, that are older than x days, but this doesn't work ether. and deleting the logs takes ages, you might want to do that in the db directly. so handle with care, as it will bloat the db and it'll be hard to find the data, you might be looking for..

don't!!1!

This is great tool to log REST API calls. Period.

1 star? 5 stars!

WordPress plugin to log REST API requests and responses

ajax Post Comment vs REST API Log