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

Ryuhei Yokokawa

Plugin will allow you to fetch the WP-API (WP-JSON-API) call with a “lang” variable. It will retrieve the right content from WPML/WP.
This only works with WPML and WP-API installed. I tested only with the latest version as of now: 
* WPML 3.1.9.6 
* WP REST API 1.2.1

WPML to WP API

Allows you to request a language with your WP-API and WPML site.

REST API Log vs WPML to WP API