Currently, we have developed a SharePoint application which uses WebParts, Application Pages, JQuery and this solution runs On-Premise. Please let me know what will be the best way to move this to a SharePoint / Azure Hosted App and make it usable in a SharePoint Online En

Hi Karthick,

I would suggest you take a look at this MSDN documentation below, it will show more details about how to transform farm solutions to SharePoint Add-ins:

https://msdn.microsoft.com/en-us/library/office/Dn986827.aspx

Thanks 

Patrick Liang