This folder holds all API related routes/functions.
Notice that the file index.js has all the routes and uses an express router to make life more simple:
var router = express.Router()That router then must be exported (typically at the end of the file) so that the file requiring it (probably app.js) can know what to do when a request is sent to the API:
module.exports = router;Also, notice that because the file is called index.js and is inside its own directory, it can be required as simply the directory name (as seen on line 20 of app.js):
var api = require('api');The routes that live in the index.js file are private and protected by authentication. The routes that live in the public.js file are able to be accessed by any anonymous or authenticated user. These routes are how users can get there JWT to become authenticated.