Hey Joy,

Currently we do not have any docs for this Rest API for Easysocial, because this REST api is not complete yet, but i believe it quite similar how you build for Jomsocial.

For example :
If you would like to do the login layer, you can take a look of this following view.json.php file which POST Parameters is required, JoomlaFolder/components/com_easysocial/views/account/view.json.php

Those API file most likely located at the view folder JoomlaFolder/components/com_easysocial/views/../view.json.php

e.g. stream part is located at this file JoomlaFolder/components/com_easysocial/views/stream/view.json.php

Hope this will help.