Ban Or Kick Member From A Group

Learn how to kick, ban, and unban members from groups using the CometChat Flutter SDK, including real-time event handling.

AI Integration Quick Reference

// Kick a member from group
CometChat.kickGroupMember(
  guid: "GROUP_ID",
  uid: "USER_ID",
  onSuccess: (String message) => debugPrint("Kicked: $message"),
  onError: (CometChatException e) => debugPrint("Error: ${e.message}"),
);

// Ban a member from group
CometChat.banGroupMember(
  guid: "GROUP_ID",
  uid: "USER_ID",
  onSuccess: (String message) => debugPrint("Banned: $message"),
  onError: (CometChatException e) => debugPrint("Error: ${e.message}"),
);

// Unban a member
CometChat.unbanGroupMember(
  guid: "GROUP_ID",
  uid: "USER_ID",
  onSuccess: (String message) => debugPrint("Unbanned: $message"),
  onError: (CometChatException e) => debugPrint("Error: ${e.message}"),
);

// Fetch banned members
BannedGroupMembersRequest request = (BannedGroupMembersRequestBuilder(guid: "GUID")
  ..limit = 30
).build();
request.fetchNext(
  onSuccess: (List<GroupMember> members) => debugPrint("Banned: $members"),
  onError: (CometChatException e) => debugPrint("Error: ${e.message}"),
);

Remove members from a group by kicking or banning them. Kicked users can rejoin; banned users cannot until they’re unbanned. Only admins and moderators can perform these actions.

There are certain actions that can be performed on the group members:

1. Kick a member from the group
2. Ban a member from the group
3. Unban a member from the group
4. Update the scope of the member of the group

All of the above actions can only be performed by the Admin or the Moderator of the group.

Available via: SDK | REST API | UI Kits

Kick a Group Member

The Admin or Moderator of a group can kick a member out of the group using the kickGroupMember() method.

Dart

String uid= "cometchat-uid-3";
String guid = "GUID";
CometChat.kickGroupMember(guid: guid,uid: uid,
  onSuccess: (String message) {
    debugPrint("Group Member Kicked  Successfully : $message");
  }, onError: (CometChatException e) {
    debugPrint("Group Member Kicked failed  : ${e.message}");
  });

The kickGroupMember() takes following parameters:

Parameter	Type	Description
guid	String	The GUID of the group from which user is to be kicked
uid	String	The UID of the user to be kicked
onSuccess	Function(String)	Callback triggered on successful kick
onError	Function(CometChatException)	Callback triggered on error

The kicked user will be no longer part of the group and can not perform any actions in the group, but the kicked user can rejoin the group.

Response

On Success — A String message confirming the member was kicked:

Parameter	Type	Description	Sample Value
message	string	Success confirmation message	"cometchat-uid-3 kicked successfully"

Error

Parameter	Type	Description	Sample Value
code	string	Error code identifier	"ERR_NOT_A_MEMBER"
message	string	Human-readable error message	"The user is not a member of this group."
details	string	Additional technical details	"Please verify the user ID and group ID and try again."

Ban a Group Member

The Admin or Moderator of the group can ban a member from the group using the banGroupMember() method. Unlike kicked users, banned users cannot rejoin until unbanned.

Dart

String uid= "cometchat-uid-3";
String guid = "GUID";
CometChat.banGroupMember(guid: guid,uid: uid,
                       onSuccess: (String message) {
                         debugPrint("Group Member Banned  Successfully : $message");
                       },onError: (CometChatException e) {
                         debugPrint("Group Member Ban failed  : ${e.message}");
                       });

The banGroupMember() method takes the following parameters:

Parameter	Type	Description
guid	String	The GUID of the group from which user is to be banned
uid	String	The UID of the user to be banned
onSuccess	Function(String)	Callback triggered on successful ban
onError	Function(CometChatException)	Callback triggered on error

The banned user will be no longer part of the group and can not perform any actions in the group. A banned user cannot rejoin the same group without being unbanned.

Response

On Success — A String message confirming the member was banned:

Parameter	Type	Description	Sample Value
message	string	Success confirmation message	"cometchat-uid-3 banned successfully"

Error

Parameter	Type	Description	Sample Value
code	string	Error code identifier	"ERR_NOT_A_MEMBER"
message	string	Human-readable error message	"The user is not a member of this group."
details	string	Additional technical details	"Please verify the user ID and group ID and try again."

Unban a Banned Group Member from a Group

Only Admin or Moderators of the group can unban a previously banned member from the group using the unbanGroupMember() method.

Dart

String uid= "cometchat-uid-3";
String guid = "GUID";
CometChat.unbanGroupMember(guid: guid,uid: uid,
                         onSuccess: (String message) {
                           debugPrint("Group Member Unbanned  Successfully : $message");
                         },
                         onError: (CometChatException e) {
                           debugPrint("Group Member Unban failed  : ${e.message}");
                         });

The unbanGroupMember() method takes the following parameters

Parameter	Type	Description
guid	String	The GUID of the group from which user is to be unbanned
uid	String	The UID of the user to be unbanned
onSuccess	Function(String)	Callback triggered on successful unban
onError	Function(CometChatException)	Callback triggered on error

The unbanned user can now rejoin the group.

Response

On Success — A String message confirming the member was unbanned:

Parameter	Type	Description	Sample Value
message	string	Success confirmation message	"cometchat-uid-3 unbanned successfully"

Error

Parameter	Type	Description	Sample Value
code	string	Error code identifier	"ERR_NOT_A_MEMBER"
message	string	Human-readable error message	"The user is not a member of this group."
details	string	Additional technical details	"Please verify the user ID and group ID and try again."

Get List of Banned Members for a Group

In order to fetch the list of banned groups members for a group, you can use the BannedGroupMembersRequest class. To use this class i.e to create an object of the BannedGroupMembersRequest class, you need to use the BannedGroupMembersRequestBuilder class. The BannedGroupMembersRequestBuilder class allows you to set the parameters based on which the banned group members are to be fetched.

The BannedGroupMembersRequestBuilder class allows you to set the below parameters:

The GUID of the group for which the banned members are to be fetched must be specified in the constructor of the GroupMembersRequestBuilder class.

Set Limit

This method sets the limit i.e. the number of banned members that should be fetched in a single iteration.

Dart

BannedGroupMembersRequestBuilder builder = BannedGroupMembersRequestBuilder(guid: conversationWith);
BannedGroupMembersRequest  bannedGroupMembersRequest = (builder
     ..limit = 50
     ).build();

Set Search Keyword

This method allows you to set the search string based on which the banned group members are to be fetched.

Dart

BannedGroupMembersRequestBuilder builder = BannedGroupMembersRequestBuilder(guid: conversationWith);
BannedGroupMembersRequest  bannedGroupMembersRequest = (builder
     ..limit = 50
     ..searchKeyword = "abc"
     ).build();

Finally, once all the parameters are set to the builder class, you need to call the build() method to get the object of the BannedGroupMembersRequest class.

Once you have the object of the BannedGroupMembersRequest class, you need to call the fetchNext() method. Calling this method will return a list of GroupMember objects containing n number of banned members where n is the limit set in the builder class.

Dart

BannedGroupMembersRequestBuilder builder = BannedGroupMembersRequestBuilder(guid: conversationWith);
BannedGroupMembersRequest  bannedGroupMembersRequest = (builder
     ..limit = 50
     ).build();

bannedGroupMembersRequest.fetchNext( onSuccess: (List<GroupMember> groupMembers) {
        debugPrint("Banned Group Members Fetched Successfully : $groupMembers");
      },onError: (CometChatException e) {
        debugPrint("Banned Group Members Fetch failed with exception: ${e.message}");
      });

Response

On Success — A List<GroupMember> containing the banned group members for the specified group (each item is a GroupMember object):

GroupMember Object (per item in array):

Parameter	Type	Description	Sample Value
uid	string	Unique identifier of the user	"cometchat-uid-3"
name	string	Display name of the user	"Kevin Hart"
link	string	Profile link	null
avatar	string	Avatar URL	"https://assets.cometchat.io/sampleapp/v2/users/cometchat-uid-3.webp"
metadata	object	Custom metadata	{}
status	string	Online status	"offline"
role	string	User role	"default"
statusMessage	string	Status message	null
tags	array	User tags	[]
hasBlockedMe	boolean	Whether this user has blocked the current user	false
blockedByMe	boolean	Whether the current user has blocked this user	false
lastActiveAt	number	Epoch timestamp of last activity	1745554700
scope	string	Member scope in the group	"participant"
joinedAt	number	Epoch timestamp when the member joined the group	1745550000

Error

Parameter	Type	Description	Sample Value
code	string	Error code identifier	"ERR_NOT_A_MEMBER"
message	string	Human-readable error message	"The user is not a member of this group."
details	string	Additional technical details	"Please verify the group ID and try again."

Real-Time Group Member Kicked/Banned Events

In other words, as a member of a group, how do I know when someone is banned/kicked when my app is running?

Implement these GroupListener methods to receive real-time notifications:

Method	Triggered When
onGroupMemberKicked()	A member is kicked
onGroupMemberBanned()	A member is banned
onGroupMemberUnbanned()	A member is unbanned

Dart

class Class_Name  with GroupListener {

//CometChat.addGroupListener("group_Listener_id", this);

@override
void onGroupMemberKicked(Action action, User kickedUser, User kickedBy, Group kickedFrom) {
  print("onGroupMemberKicked ");
}
void onGroupMemberBanned(Action action, User bannedUser, User bannedBy, Group bannedFrom) {

  print("onGroupMemberBanned ");
}

@override
void onGroupMemberUnbanned(Action action, User unbannedUser, User unbannedBy, Group unbannedFrom) {
  print("onGroupMemberUnbanned ");
}
}

Always remove group listeners when they’re no longer needed (e.g., in the dispose() method). Failing to remove listeners can cause memory leaks and duplicate event handling.

CometChat.removeGroupListener("group_Listener_id");

Missed Group Member Kicked/Banned Events

In other words, as a member of a group, how do I know when someone is banned/kicked when my app is not running?

When you retrieve the list of previous messages if a member has been kicked/banned/unbanned from any group that the logged-in user is a member of, the list of messages will contain an Action message. An Action message is a sub-class of BaseMessage class.

Kicked event:

Field	Value/Type	Description
action	"kicked"	The action type
actionBy	User	The user who kicked the member
actionOn	User	The member who was kicked
actionFor	Group	The group from which the member was kicked

Banned event:

Field	Value/Type	Description
action	"banned"	The action type
actionBy	User	The user who banned the member
actionOn	User	The member who was banned
actionFor	Group	The group from which the member was banned

Unbanned event:

Field	Value/Type	Description
action	"unbanned"	The action type
actionBy	User	The user who unbanned the member
actionOn	User	The member who was unbanned
actionFor	Group	The group from which the member was unbanned

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Next Steps

Add Members

Add new members to your groups

Change Member Scope

Update member roles and permissions

Retrieve Group Members

Fetch the list of members in a group

Leave a Group

Allow members to leave a group