# Check if channel username is already in use

Used for inline validation during channel creation. Scoped to the group. Returns a result object indicating whether the username is taken within the specified group.

RBAC: requires GroupChannels.Manage

Endpoint: GET /api/v1/groups/{groupId}/channels/namecheck/{channelUsername}
Version: 1.0
Security: 

## Path parameters:

  - `channelUsername` (string, required)
    The channel username (slug) to check for availability

  - `groupId` (string, required)
    The unique identifier of the group
    Example: "us_01hxcvk1hjexere4pvtrj0ymqq"

## Response 200 fields (application/json):

  - `exists` (boolean, required)
    Whether the group name already exists in the database
    Example: true