---
title: "License | Customer's Canvas On-Premises"
canonical: "https://customerscanvas.com/docs/on-premises/design-atoms-js/reference/design-atoms/License/"
---

# License

> [`LicenseHandler`](#licensehandler)

## Classes

### LicenseHandler

#### Constructors

##### Constructor

```ts
new LicenseHandler(viewer, apiClient): LicenseHandler;
```

###### Parameters

| Parameter | Type |
| ------ | ------ |
| `viewer` | [`Viewer`](https://customerscanvas.com/docs/on-premises/design-atoms-js/reference/design-atoms/Viewer-1.md#viewer) |
| `apiClient` | [`IDesignAtomsApiClient`](https://customerscanvas.com/docs/on-premises/design-atoms-js/reference/design-atoms/IDesignAtomsApiClient.md#idesignatomsapiclient) |

###### Returns

#### Methods

##### checkLicense()

```ts
checkLicense(): Promise<void>;
```

###### Returns

[`Promise`](https://customerscanvas.com/docs/on-premises/design-atoms-js/reference/design-atoms/finally.md#promise)\<`void`\>