MadelineProtoDocs/old_docs/API_docs_v42/methods/channels.checkUsername.md

title	description	image	redirect_from
channels.checkUsername	Check if a username is free and can be assigned to a channel/supergroup	https://docs.madelineproto.xyz/favicons/android-chrome-256x256.png	/API_docs/methods/channels_checkUsername.html

Method: channels.checkUsername

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Check if a username is free and can be assigned to a channel/supergroup

Parameters:

Name	Type	Description	Required
channel	Username, chat ID, Update, Message or InputChannel	The channel/supergroup that will assigned the specified username	Optional
username	string	The username to check	Yes

Return type: Bool

Can bots use this method: NO

MadelineProto Example (now async for huge speed and parallelism!):

if (!file_exists('madeline.php')) {
    copy('https://phar.madelineproto.xyz/madeline.php', 'madeline.php');
}
include 'madeline.php';

$MadelineProto = new \danog\MadelineProto\API('session.madeline');
$MadelineProto->start();

$Bool = $MadelineProto->channels->checkUsername(['channel' => InputChannel, 'username' => 'string', ]);

Or, if you're into Lua:

Bool = channels.checkUsername({channel=InputChannel, username='string', })

Errors

Code	Type	Description
400	CHANNEL_INVALID	The provided channel is invalid
400	CHANNELS_ADMIN_PUBLIC_TOO_MUCH	You're admin of too many public channels, make some channels private to change the username of this channel
400	CHAT_ID_INVALID	The provided chat id is invalid
400	USERNAME_INVALID	The provided username is not valid