> For the complete documentation index, see [llms.txt](https://docs.cascade.io/cascade/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.cascade.io/cascade/functions-and-expressions/functions/logical/isnull.md).

# ISNULL

ISNULL( `value` )

Returns `true` if a value is null, returns `false` otherwise

### Arguments

| Argument | Description     |
| -------- | --------------- |
| `value`  | Value or column |

### Output

Outputs `true` if `value` is null

### Example

{% embed url="<https://datawrapper.dwcdn.net/KKn2y/1/>" %}