# Nullify empty string

> Supported in: Batch, Faster, Streaming

Convert empty strings to null.

**Expression categories:** String

## Declared arguments

* **Expression:** *no description*<br>*Expression\<String>*

**Output type:** *String*

## Examples

### Example 1: Base case

**Argument values:**

* **Expression:** *empty string*

**Output:** *null*

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### Example 2: Base case

**Argument values:**

* **Expression:** hello world

**Output:** hello world

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### Example 3: Null case

**Argument values:**

* **Expression:** *null*

**Output:** *null*

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