---
schema_version: "1"
id: 9477ab213778aa3820c847d9ba643bb3a7111ee0bfb5034629e4fa74d4ae7c7b
title: isKeyType
collection: mulesoft
version: current
locale: en-us
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canonical_url: https://docs.mulesoft.com/dataweave/latest/dw-types-functions-iskeytype
source_site: docs.mulesoft.com
content_type: documentation
content_hash: 68db08e25bce4218d97dc4797b2dabb9a823b271846ad3b453ce52f630763a12
description: MuleSoft Documentation Site
release: "2.13"
latest: true
---
---
product: DataWeave
version: 2.13
is-latest-version: true
---

# isKeyType

> For the full documentation index, see: https://docs.mulesoft.com/llms.txt

## isKeyType(t: Type): Boolean

Returns `true` if the input is the Key type.

_Introduced in DataWeave version 2.3.0._

### Parameters

<table><colgroup><col> <col></colgroup><thead><tr><th>Name</th><th>Description</th></tr></thead><tbody><tr><td><p><code>t</code></p></td><td><p>The type to check.</p></td></tr></tbody></table>

### Example

This example shows how `isKeyType` behaves with different inputs.

#### Source

```DataWeave
%dw 2.0
import * from dw::core::Types
type AKey = Key
output application/json
---
{
   a: isKeyType(AKey),
   b: isKeyType(Key),
   c: isKeyType(Boolean),
}
```

#### Output

```Json
{
  "a": true,
  "b": true,
  "c": false
}
```