SharePoint Site Explorer 365 (SPSE 365) is a cloud-based app for Office 365 and SharePoint 2013 On-Premise.
It provides you with an in-depth understanding of your Office 365 site configuration, structure and settings.
It lets you quickly perform breadth-first or depth-first site analysis. It offers a faster way of exploring the site objects than using out-of-the box user interface.
If you are technicologically savvy then it can reveal the JSON requests/response data. Furthermore, SPSE 365 installation is breeze with no server side code deployment.
Whether you have your site in the cloud (SharePoint online/Office 365) or on Premise in SharePoint 2013, SharePoint Site Explorer 365 App can be added to your site in no time.