I want to export data in excel in server side and download that excel file to client side on button click . I created a web service method and made an ajax call from jQuery. In the web service, I was able to create excel and store it to the server side module but I am unable to download the file on client side. Here Mudassar Ahmed Khan has explained with an example, how to convert Excel (XLS and XLSX) file data to JSON using jQuery. Once File is selected in FileUpload control, it is read as Binary data and then the Binary data is read using the xlsx Excel plugin which returns the Excel file data in JSON array format.