sheetjs/docbits/30_export.md

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## Writing Workbooks
For writing, the first step is to generate output data. The helper functions
`write` and `writeFile` will produce the data in various formats suitable for
dissemination. The second step is to actual share the data with the end point.
Assuming `workbook` is a workbook object:
<details>
<summary><b>nodejs write a file</b> (click to show)</summary>
```js
/* output format determined by filename */
XLSX.writeFile(workbook, 'out.xlsx');
/* at this point, out.xlsx is a file that you can distribute */
```
</details>
<details>
<summary><b>Browser download file</b> (click to show)</summary>
Note: browser generates binary blob and forces a "download" to client. This
example uses [FileSaver.js](https://github.com/eligrey/FileSaver.js/):
```js
/* bookType can be any supported output type */
var wopts = { bookType:'xlsx', bookSST:false, type:'binary' };
var wbout = XLSX.write(workbook,wopts);
function s2ab(s) {
var buf = new ArrayBuffer(s.length);
var view = new Uint8Array(buf);
for (var i=0; i!=s.length; ++i) view[i] = s.charCodeAt(i) & 0xFF;
return buf;
}
/* the saveAs call downloads a file on the local machine */
saveAs(new Blob([s2ab(wbout)],{type:"application/octet-stream"}), "test.xlsx");
```
</details>
<details>
<summary><b>Browser upload to server</b> (click to show)</summary>
A complete example using XHR is [included in the xhr demo](demos/xhr/), along
with examples for fetch and wrapper libraries. This example assumes the server
can handle Base64-encoded files (see the demo for a basic nodejs server):
```js
/* in this example, send a base64 string to the server */
var wopts = { bookType:'xlsx', bookSST:false, type:'base64' };
var wbout = XLSX.write(workbook,wopts);
var oReq = new XMLHttpRequest();
oReq.open("POST", "/upload", true);
var formdata = new FormData();
formdata.append('file', 'test.xlsx'); // <-- server expects `file` to hold name
formdata.append('data', wbout); // <-- `data` holds the base64-encoded data
oReq.send(formdata);
```
</details>
### Writing Examples
- <http://sheetjs.com/demos/table.html> exporting an HTML table
- <http://sheetjs.com/demos/writexlsx.html> generates a simple file