Defining a module 
A data module is just a JavaScript object containing a module name and a builder function.
The builder function receives two BaseClient instances when loaded: one for private data stored in /my-module-name/ and one for public data stored in /public/my-module-name/. A module must return an object, with the properties and functions to be used in an app as exports:
javascript
const Bookmarks = { name: 'bookmarks', builder: function(privateClient, publicClient) {
  return {
    exports: {
      addBookmark: function() {}
    }
  }
}};You can then load the module into your RemoteStorage instance, either on initialization or later using the addModule() function:
js
const remoteStorage = new RemoteStorage({ modules: [ Bookmarks ] });
// or later:
remoteStorage.addModule(Bookmarks);The module will then be accessible on the instance by its name, allowing you to call the functions and properties that it exports:
js
remoteStorage.bookmarks.addBookmark()