---
schema_version: "1"
id: 26a47c3e0b5326bc620406aa79f72bd9bb18007bbb17fc597b30e341580b4948
title: baseTypeOf
collection: mulesoft
version: current
locale: en-us
portal_url: https://docs.salesforce.com/mulesoft/current/en-us/dataweave/2.4/dw-types-functions-basetypeof.md
canonical_url: https://docs.mulesoft.com/dataweave/2.4/dw-types-functions-basetypeof
source_site: docs.mulesoft.com
content_type: documentation
content_hash: 00f52c8b4a7ec3cb1075fbe63bd3c474b92635ec85d83a197003353cac8c87a7
description: MuleSoft Documentation Site
release: "2.4"
latest: false
---
---
product: DataWeave
version: 2.4
---

# baseTypeOf

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

## baseTypeOf(t: Type): Type

Returns an the base type of the given 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 `baseTypeOf` behaves with different inputs.

#### Source

```DataWeave
%dw 2.0
import * from dw::core::Types
type AType = String {format: "YYYY-MM-dd"}
output application/json
---
{
   a: baseTypeOf(AType)
}
```

#### Output

```Json
{
  "a": "String"
}
```