> For the complete documentation index, see [llms.txt](https://dev.vulos.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://dev.vulos.io/reference/identity-javascript-sdk/the-base-package/authentication/application.md).

# Application

## Members

### `id : string`

The Client ID of this application.

### `secret : string?`

The Client Secret of this application.

### `scope : string`

The [OpenID scope](/identity/scopes-and-claims.md) of this application.

### `responseTypes : string[]`

The OpenID response types of this application.

### `redirectUrls : string[]`

The OpenID redirect URLs of this application.

### `postLogoutRedirectUrls : string[]?`

The OpenID post logout redirect URLs of this application.

## Methods

### `constructor(config)`

Create a Vulos Application object based on a configuration object that has the following properties:

* `id: string` (required): The Client ID of the Application (you can obtain this from the Vulos Identity dashboard by creating an application);
* `secret: string`: The Client Secret of the Application (you can obtain this from the Vulos Identity dashboard by creating an application, non-applicable for browser applications that use the implicit flow);
* `scope: string` (required): The OIDC scopes - "permissions" that your application has, they must match your application in the Vulos Identity dashboard.
* `redirectUrls: string[]` (required): The URLs where Vulos Identity redirects after a user interaction;
* `postLogoutRedirectUrls: string[]`: The URLs where Vulos Identity redirects after a successful logout;
* `responseTypes: string[]`: The OIDC response types (defaults to `['code']` if a client secret is provided);

```javascript
const application = new Application({
    // this is an example Client ID, replace with your own
    id: "796FZE9KLOLO0VSSBNOE",
    // this is an example Client Secret, replace with your own
    secret: "5a9b30a4f2f7f5edb5087e2258c3ecc0fc4129853e28f2f48f10b21b60388f1f",
    // this is an example scope string, modify according to your needs
    scope: "openid offline_access organization:manage",
    
    // change these URLs to match your site or application
    redirectUrls: [ "http://localhost/callback/login" ],
    postLogoutRedirectUrls: [ "http://localhost/callback/logout" ],
    
    // https://openid.net/specs/oauth-v2-multiple-response-types-1_0.html
    responseTypes: [ "code" ]
})
```

### `createAuth(authApi, endpoint?)`

Create an authentication object for this application based on a constructor specified in `authApi` that's provided by [`@vulos/identity-browser-sdk`](/reference/identity-javascript-sdk/the-frontend-auth-package.md) or [`@vulos/identity-node-sdk`](/reference/identity-javascript-sdk/the-backend-auth-package.md).

{% hint style="info" %}
If an `endpoint` argument is provided, that will be used instead of the default Vulos Identity endpoint.
{% endhint %}

```javascript
// If you intend to use this code in the frontend, 
// use "FrontendAuth" from "@vulos/identity-browser-sdk"
import { BackendAuth } from "@vulos/identity-node-sdk"

// ...

const auth = application.createAuth(BackendAuth)
```

{% hint style="info" %}
See [`BaseAuth`](/reference/identity-javascript-sdk/the-base-package/authentication/baseauth.md) for more information.
{% endhint %}