---
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title: isUndefinedOrNull()
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content_type: documentation
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---

# isUndefinedOrNull()

Checks if the object is `undefined` or `null`.

## Signature

`isUndefinedOrNull(Object obj)`

## Parameters

**_obj_:** Type: `Object`. The object to check.

## Returns

**Type: `Boolean`**

Returns `true` if the object is `undefined` or `null`, or `false` otherwise.