# Method: account.checkUsername

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Validates a username and checks availability.

# Parameters:

Name Type Description Required
username string username
Accepted characters: A-z (case-insensitive), 0-9 and underscores.
Length: 5-32 characters.		 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->account->checkUsername(['username' => 'string', ]);

Or, if you’re into Lua:

Bool = account.checkUsername({username='string', })

# Errors

Code Type Description
400 USERNAME_INVALID The provided username is not valid
406 AUTH_KEY_DUPLICATED An auth key with the same ID was already generated
401 SESSION_PASSWORD_NEEDED 2FA is enabled, use a password to login
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