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

# workbook.getColumnName

Returns a column's letter from its index, starting at `0`. For example, `0` returns `"A"` and `26` returns `"AA"`. It works the same as [workbook.columnIndexToName](/process-functions/workbook-columnindextoname).

```js
workbook.getColumnName(columnNumber)
```

## Parameters

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

## Returns

The column's letter.

## Examples

```js
const columnName = workbook.getColumnName(2); // "C"
```

## Related

* [workbook.columnIndexToName](/process-functions/workbook-columnindextoname)
* [workbook.columnNameToIndex](/process-functions/workbook-columnnametoindex)