If you want to convert node content to json . Url of the json will be password protected .This module is helpful, create a basic framework for drupal developer to create password protected content for android or iPhone applications.
This is the Devel / MimeMail module. It adds a custom mail system:
"DevelMimeMailSystem", which is a mashup of DevelMailLog and MimeMailSystem.
It stores HTML mail to the file system so you can debug or style html messages
sent out by Drupal.
The main idea for this module is to add the functionality of a fieldable menu entity to the entity_menu_links module. Eventually it would be nice to have this code within that module, however for the sake of speed we whipped up a module that users alters to do the work.
If you are considering downloading this module, there is probably a better way to solve whatever problem you are having. However, I believe in a free democracy that allows people to make their own choices.