---
url: /process-functions/workbook-columnindextoname.md
description: Returns a column's letter from its index.
---

# workbook.columnIndexToName

Returns a column's letter from its index, starting at `0`. For example, `0` returns `"A"` and `26` returns `"AA"`.

```js
workbook.columnIndexToName(column)
```

## Parameters

| Parameter | Type | Description |
|---|---|---|
| `column` | `number` | The column's index, starting at `0`. |

## Returns

The column's letter.

## Examples

```js
const name = workbook.columnIndexToName(27); // "AB"
```

## Related

* [workbook.columnNameToIndex](/process-functions/workbook-columnnametoindex)
* [ExcelWorkbook](/process-functions/excel-workbook)