The native data format for the Spreadsheet widget is JSON.
The Spreadsheet also features built-in support for Excel export that runs in the browser. To export huge datasets to Excel, you can use the RadSpreadStreamProcessing library which is part of Telerik Document Processing (TDP).
- For examples on how to export Excel files, refer to the RadSpreadProcessing library.
- For more information on the Spreadsheet server-side processing, refer to this article.