> ## Documentation Index
> Fetch the complete documentation index at: https://nango.dev/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# How to register your own Looker OAuth app

> Register an OAuth client application with Looker and connect it to Nango

This guide shows you how to register an OAuth client application with your Looker instance. This is required before any user can authenticate into the Looker API via OAuth.

<Steps>
  <Step title="Install the API Explorer">
    The API Explorer is a Looker Marketplace extension used to register OAuth apps.

    1. Log in to your Looker instance with admin access. You need the `develop`, `manage_models`, and `deploy` permissions to install from the Marketplace.
    2. Navigate to the **Looker Marketplace** and search for **API Explorer**.
    3. Install the extension. Once installed, it appears under **Applications** in the left sidebar.

    <Tip>If your admin has enabled **Auto Install** in Admin > Platform > Marketplace, the API Explorer is already installed and kept up to date automatically.</Tip>
  </Step>

  <Step title="Add your origin to the embedded domain allowlist">
    Looker requires your application's origin to be allowlisted before OAuth code exchange can succeed.

    1. Navigate to **Admin** > **Embed**.
    2. Under **Embedded Domain Allowlist**, add `https://api.nango.dev`.

    <Warning>Do not include a trailing slash (`/`) in the domain URL.</Warning>
  </Step>

  <Step title="Register the OAuth client application">
    1. Open the **API Explorer** from the **Applications** section of the left sidebar.

       <Tip>Admins can also open it via **Admin** > **API** > **Use API Explorer**.</Tip>
    2. Using the version drop-down at the top, select **4.0 - current**.
    3. Search for `register_oauth_client_app` in the Search field, or navigate to the **Auth** method category and find it there.
    4. Select the method and click **Run It** to open the request panel.
    5. In the **Request** tab, fill in the following parameters:

    | Parameter      | Value                                                   |
    | -------------- | ------------------------------------------------------- |
    | `client_guid`  | A unique identifier for your app (e.g., `my-nango-app`) |
    | `redirect_uri` | `https://api.nango.dev/oauth/callback`                  |
    | `display_name` | The name shown to users on the consent screen           |
    | `description`  | What your app does with the user's Looker account       |

    6. Check the **data change confirmation** checkbox (required for POST requests).
    7. Click **Run** to register the application. The **Response** tab will confirm the registration.
  </Step>

  <Step title="Next">
    Follow the [*Quickstart*](/getting-started/quickstart) to connect your first account.
  </Step>
</Steps>

For more details, see [Looker's OAuth authentication documentation](https://docs.cloud.google.com/looker/docs/api-cors#oauth_authentication_overview).

***