# Check User Data Type Name Existence

This API can be used to check if a specified custom data type name is already defined in the system.

## Endpoint

`GET /dcapi/customColumn/udtNameExists`

## Request URL

`https://{serverurl}/dcapi/customColumn/udtNameExists`

[{serverurl}](https://www.manageengine.com/products/desktop-central/help/api/cloud/oauth-authentication-endpoint-domain.html)

## Scope

`DesktopCentralCloud.CustomField.READ`

### Header

`Authorization: Zoho-oauthtoken d92d4xxxxxxxxxxxxx15f52`

## Request Parameters

### Request Headers

- **Content-Type** `string` **Mandatory**: `application/udtExistsDetails.v1+json`

### Query Parameters

- **udtName** `string` **Mandatory**: The name of the custom data type to check for existence

## Sample Request

```curl
curl --request GET \
  --url 'https://appdomains/dcapi/customColumn/udtNameExists?udtName=SOME_STRING_VALUE' \
  --header 'Authorization: Zoho-oauthtoken  d92d4xxxxxxxxxxxxx15f52' \
  --header 'Content-Type: application/udtExistsDetails.v1+json'
```

## Response Parameters

### HTTP Code 200

#### Response Body — application/json

- `JSON Object`
  - **exists** `boolean`: Indicates whether the specified custom data type name already exists in the system (true/false)

## Sample Response: HTTP 200

```json
{
  "exists": true
}
```

## Rate Limits

**Duration:** 1 minute | **Threshold:** 30 | **Lock period:** 5 minutes

Duration - Time window for the threshold.  
Threshold - Number of API calls allowed within the specified duration.  
Lock Period - Wait time before consecutive API requests.