# Excel Input&Output Demo

This example demonstrates how to use Spread.Services as server-side spreadsheet model, and use Spread.Sheets as the front-end side viewer and editor.

- Spread.Services can import an excel file and export to ssjson format, then transport the ssjson to client-side.
- Spread.Sheets at client-side can receive and load the ssjson from server-side.
- You can view the content of excel file through Spread.Sheets.
- You can also make some changes to the content, and send the whole document as ssjson to Spread.Services at server-side.
- Spread.Services at server-side then load the ssjson and then save to excel file, you can download the modified excel file.