54 lines
1.4 KiB
Markdown
54 lines
1.4 KiB
Markdown
---
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title: account.checkUsername
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description: Validates a username and checks availability.
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image: https://docs.madelineproto.xyz/favicons/android-chrome-256x256.png
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redirect_from: /API_docs/methods/account_checkUsername.html
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---
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# Method: account.checkUsername
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[Back to methods index](index.md)
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Validates a username and checks availability.
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### Parameters:
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| Name | Type | Description | Required |
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|----------|---------------|-------------|----------|
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|username|[string](../types/string.md) | Username<br>Accepted characters: A-z (case-insensitive), 0-9 and underscores.<br>Length: 5-32 characters. | Yes|
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### Return type: [Bool](../types/Bool.md)
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### Can bots use this method: **NO**
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### MadelineProto Example ([now async for huge speed and parallelism!](https://docs.madelineproto.xyz/docs/ASYNC.html)):
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```php
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if (!file_exists('madeline.php')) {
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copy('https://phar.madelineproto.xyz/madeline.php', 'madeline.php');
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}
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include 'madeline.php';
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$MadelineProto = new \danog\MadelineProto\API('session.madeline');
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$MadelineProto->start();
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$Bool = $MadelineProto->account->checkUsername(['username' => 'string', ]);
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```
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Or, if you're into Lua:
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```lua
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Bool = account.checkUsername({username='string', })
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```
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### Errors
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| Code | Type | Description |
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|------|----------|---------------|
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|400|USERNAME_INVALID|The provided username is not valid|
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|406|AUTH_KEY_DUPLICATED|An auth key with the same ID was already generated|
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