Accesing Sharepoint Online From Various Clients

I have a sharepoint online site were I'm using announcements. These announcements I would like to consume in a Cordova app and also on a HTML5 site that I have on some info screens

Solution 1:

If your Sharepoint online is connected with Azure AD, then you can use Azure AD application access sharepoint REST API with CORS enabled. Follow the steps at https://msdn.microsoft.com/en-us/office/office365/howto/create-web-apps-using-CORS-to-access-files-in-Office-365