MadelineProtoDocs/old_docs/API_docs_v91/methods/channels.checkUsername.md

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---
title: channels.checkUsername
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description: Check if a username is free and can be assigned to a channel/supergroup
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image: https://docs.madelineproto.xyz/favicons/android-chrome-256x256.png
---
# Method: channels.checkUsername
[Back to methods index](index.md)
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Check if a username is free and can be assigned to a channel/supergroup
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### Parameters:
| Name | Type | Description | Required |
|----------|---------------|-------------|----------|
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|channel|[Username, chat ID, Update, Message or InputChannel](../types/InputChannel.md) | The [channel/supergroup](https://core.telegram.org/api/channel) that will assigned the specified username | Optional|
|username|[string](../types/string.md) | The username to check | Yes|
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### Return type: [Bool](../types/Bool.md)
### Can bots use this method: **NO**
### MadelineProto Example ([now async for huge speed and parallelism!](https://docs.madelineproto.xyz/docs/ASYNC.html)):
```php
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:
```lua
Bool = channels.checkUsername({channel=InputChannel, username='string', })
```
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### Errors
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| Code | Type | Description |
|------|----------|---------------|
|400|CHANNEL_INVALID|The provided channel is invalid|
|400|CHAT_ID_INVALID|The provided chat id is invalid|
|400|USERNAME_INVALID|The provided username is not valid|
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