# Create a new group channel

Creates a new channel within the specified group. Requires group administrator privileges. The channel's privacy is constrained by the parent group's privacy settings (private groups can only have private channels). The first channel created is automatically designated as both main and default. Channels can have both scoped usernames (group-specific) and optional global usernames (platform-wide). Note: Avatar and header images must be set via the update endpoint after channel creation.

RBAC: requires GroupChannels.Manage

Endpoint: POST /api/v1/groups/{groupId}/channels
Version: 1.0
Security: 

## Query parameters:

  - `htmlContent` (any)
    Returns text as html if true or original text if false. Applicable only to local posts and users. Default is true.

## Path parameters:

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

## Request fields (application/json):

  - `username` (string, required)
    Channel identifier scoped to the group. Must be unique within the group. Used to generate the channel's username in format 'groupname:channelname' for private channels.
    Example: "news"

  - `displayName` (string, required)
    Human-readable display name for the channel. Shown in channel listings and UI.
    Example: "Group News"

  - `summary` (string, required)
    Brief description of the channel's purpose and content (max 1024 characters)
    Example: "Read group news and announcements here"

  - `privacy` (string, required)
    Channel privacy level. PUBLIC channels are visible to everyone, PRIVATE channels only to group members. Private groups can only have private channels.
    Enum: "PUBLIC", "PRIVATE"

  - `isMain` (boolean)
    Whether this channel should be the main channel for the group. Only one main channel allowed per group. The first channel created is automatically made main.

  - `isDefault` (boolean)
    Whether this channel should be a default channel. Default channels are automatically followed by new group members. The first channel created is automatically made default.
    Example: true

  - `globalUsername` (string,null)
    Global username for public channels. Must be unique across the entire platform. Allows the channel to be accessed via '@globalUsername' in addition to the scoped username. Only available for public channels in public groups.
    Example: "platform-news"

## Response 200 fields (application/json):

  - `groupUserName` (string,null)
    Name of the channel inside a group

  - `id` (string, required)
    internal id of this user
    Example: "us_01hxcvk1hjexere4pvtrj0ymqq"

  - `username` (string, required)
    unique user name
    Example: "john_smith"

  - `domain` (string, required)
    user's domain, remote only, empty for local
    Example: "wlsly1.net"

  - `displayName` (string, required)
    full name of the user
    Example: "John Smith"

  - `summary` (string, required)
    User's summary or bio
    Example: "Pixels are my paint, code is my canvas, creativity is my brush."

  - `uri` (string, required)
    URI of this user
    Example: "https://wlsly1.net/users/john_smith"

  - `stats` (object, required)
    User stats

  - `stats.posts` (integer, required)
    number of posts

  - `stats.followers` (integer, required)
    number of followers

  - `stats.following` (integer, required)
    number of following

  - `stats.followingHidden` (boolean, required)
    privacy setting to hide followings

  - `stats.totalStorageBytes` (integer, required)
    total storage volume in bytes

  - `stats.comments` (integer, required)
    number of comments

  - `fields` (object, required)
    User fields

  - `avatar` (object,null)
    User's avatar

  - `avatar.uploadId` (string, required)
    Internal id
    Example: "us_01hxcvk1hjexere4pvtrj0ymqq"

  - `avatar.userId` (string, required)
    User id this upload belongs to
    Example: "us_01hxcvk1hjexere4pvtrj0ymqq"

  - `avatar.uploadType` (string, required)
    Type of the upload
    Enum: "VIDEO", "IMAGE", "AUDIO", "DOCUMENT", "OTHER"

  - `avatar.meta` (object, required)
    Meta data

  - `avatar.meta.blurhash` (string,null)

  - `avatar.meta.name` (string,null)

  - `avatar.meta.altText` (string,null)

  - `avatar.size` (integer, required)
    Size in bytes of all the files in this upload

  - `avatar.files` (array, required)
    List of all the files this upload has

  - `avatar.files.uri` (string,null, required)
    Full url of the file

  - `avatar.files.fileId` (string, required)
    File id
    Example: "us_01hxcvk1hjexere4pvtrj0ymqq"

  - `avatar.files.extension` (string, required)
    File extension
    Example: "mp4"

  - `avatar.files.original` (boolean, required)
    true if this file is original, false if it is a derivative

  - `avatar.files.meta` (object, required)
    File metadata. Contains optional values for width, height etc.

  - `avatar.files.meta.duration` (number,null)
    Video duration in seconds

  - `avatar.files.meta.width` (integer,null)
    Media width

  - `avatar.files.meta.height` (integer,null)
    Media height

  - `avatar.files.meta.codec` (string,null)
    Video codec

  - `avatar.files.meta.rotate` (integer,null)
    Rotation in degrees

  - `avatar.files.size` (integer, required)
    File size in bytes

  - `avatar.files.createdAt` (string, required)
    Example: "2022-03-10T16:15:50Z"

  - `avatar.files.updatedAt` (string, required)
    Example: "2022-03-10T16:15:50Z"

  - `avatar.files.type` (string, required)
    File type
    Enum: "VIDEO", "IMAGE", "AUDIO", "DOCUMENT", "OTHER"

  - `avatar.tags` (array, required)
    List of tags attached to upload
    Enum: "Post", "Avatar", "Header", "Album", "Emoji", "Event"

  - `avatar.error` (string,null)
    Upload processing error

  - `avatar.cached` (boolean)
    true if cached

  - `avatar.logs` (string,null)
    Logs

  - `avatar.remote` (boolean)
    true if this upload is remote

  - `header` (object,null)
    User's header

  - `deleted` (boolean,null)

  - `state` (string, required)
    User's moderation state
    Enum: "REGULAR", "SENSITIVE", "LIMITED", "SUSPENDED"

  - `relationship` (object,null)
    Relationship with this user

  - `relationship.following` (string,null)
    Does the viewer follow the target?
    Enum: "PENDING", "ACCEPTED", "REJECTED"

  - `relationship.followed` (string,null)
    Does the target follow the viewer?
    Enum: "PENDING", "ACCEPTED", "REJECTED"

  - `relationship.blocked` (boolean,null)
    Viewer blocked the target

  - `relationship.blockedBy` (boolean,null)
    Target blocked the viewer

  - `relationship.muted` (object,null)
    Viewer mutes the target

  - `relationship.muted.state` (boolean)

  - `relationship.muted.expiresAt` (string,null)
    Example: "2022-03-10T16:15:50Z"

  - `relationship.note` (string,null)
    Viewer's private note about the target

  - `emojis` (array,null)

  - `emojis.shortcode` (string, required)

  - `emojis.category` (string,null)

  - `emojis.url` (string, required)

  - `emojis.staticUrl` (string, required)

  - `emojis.visibleInPicker` (boolean)

  - `location` (object,null)
    User's location, geo and name

  - `location.geo` (object,null)
    Coordinates and other geo data

  - `location.geo.latitude` (number)

  - `location.geo.longitude` (number)

  - `location.geo.altitude` (number,null)

  - `location.geo.accuracy` (number,null)

  - `location.geo.verticalAccuracy` (number,null)

  - `location.geo.speed` (number,null)

  - `location.geo.bearing` (number,null)

  - `location.geo.timestamp` (integer,null)

  - `location.autoUpdate` (boolean)

  - `location.show` (boolean)

  - `timezone` (object,null)
    User's timezone

  - `timezone.ianaTimezone` (string,null)

  - `birthday` (object,null)
    User's birthday

  - `birthday.date` (string,null)
    Example: "2022-03-10T16:15:50Z"

  - `software` (string, required)
    Software platform type (wellesley, mastodon, threads.net)
    Example: "wellesley"

  - `channel` (boolean)
    is channel user

  - `groupId` (string,null)
    UUID with type prefix
    Example: "us_01hxcvk1hjexere4pvtrj0ymqq"

  - `groupPrivacy` (string,null)
    * PUBLIC - Channel is visible to everyone and can be followed by anyone.
      * PRIVATE - Channel is visible only to group members and can only be followed by group members.
    Enum: "PUBLIC", "PRIVATE"

  - `groupMain` (boolean,null)

  - `groupDefault` (boolean,null)

  - `actorType` (string,null)
    Whether this user is a person, application or a service
    Enum: "Application", "Group", "Organization", "Person", "Service"


## Response 400 fields