sheetjs-clone/docbits/31_writestream.md

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### Streaming Write
The streaming write functions are available in the `XLSX.stream` object. They
take the same arguments as the normal write functions but return a Readable
Stream. They are only exposed in NodeJS.
- `XLSX.stream.to_csv` is the streaming version of `XLSX.utils.sheet_to_csv`.
- `XLSX.stream.to_html` is the streaming version of `XLSX.utils.sheet_to_html`.
- `XLSX.stream.to_json` is the streaming version of `XLSX.utils.sheet_to_json`.
<details>
2017-09-24 23:40:09 +00:00
<summary><b>nodejs convert to CSV and write file</b> (click to show)</summary>
```js
var output_file_name = "out.csv";
var stream = XLSX.stream.to_csv(worksheet);
stream.pipe(fs.createWriteStream(output_file_name));
```
</details>
<details>
<summary><b>nodejs write JSON stream to screen</b> (click to show)</summary>
```js
/* to_json returns an object-mode stream */
var stream = XLSX.stream.to_json(worksheet, {raw:true});
/* the following stream converts JS objects to text via JSON.stringify */
var conv = new Transform({writableObjectMode:true});
conv._transform = function(obj, e, cb){ cb(null, JSON.stringify(obj) + "\n"); };
stream.pipe(conv); conv.pipe(process.stdout);
```
</details>
<https://github.com/sheetjs/sheetaki> pipes write streams to nodejs response.