# 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
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