# Add a custom domain to the application.

**POST /api/applications/{id}/protected-app-metadata/custom-domains**

Add a custom domain to the application. You'll need to setup DNS record later.


## Servers
- Logto endpoint address.: https://[tenant_id].logto.app (Logto endpoint address.)


## Authentication methods
- OAuth2


## Parameters

### Path parameters
- **id** (string)
  The unique identifier of the application.


### Body: application/json (object)

- **domain** (string)
  The domain to be added to the application.


## Responses
### 201
The domain has been added to the application.

### 400
Bad Request

### 401
Unauthorized

### 403
Forbidden

### 404
Not Found

### 409
The domain already exists.

### 422
Exeeded the maximum number of domains allowed or the domain is invalid.

### 501
Not Implemented


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