Rajat

This Plugin Create a options which can provide ability to disable all or particular routes for json api.This plugin 
help to restrict the use of public credentials of website.This will protect the data such as users details of wordpress 
etc

Restrict Json Rest Api

Plugin to restrict json rest api, which you want to restrict to use from outside

Ali Qureshi

JSON API Cincopa plugin extends the JSON API Plugin with a new Controller to provide Cincopa Easy Albums Listing for any user. This plugin is for WordPress/Mobile app developers who want to use Cincopa Easy Albums Plugin in conjunction with JSON API plugin as media gallery for their mobile app.
Features include:
<ul>
<li>Easy Albums Listing</li>
<li>Easy Albums Items Listing</li>
</ul>
The plugin was created to make available Cincopa Easy Albums Plugin Media listing for mobile apps via JSON API Plugin.
Hope this will help some.
For details, please check this: http://www.parorrey.com/solutions/json-api-cincopa/

JSON API Cincopa

Extends the JSON API Plugin to allow RESTful Cincopa Easy Albums Listing for any user

Restrict Json Rest Api vs JSON API Cincopa