MadelineProto/old_docs/API_docs_v66/methods/channels_checkUsername.md

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---
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title: channels.checkUsername
description: channels.checkUsername parameters, return type and example
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---
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## Method: channels.checkUsername
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[Back to methods index](index.md)
### Parameters:
| Name | Type | Required |
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|----------|---------------|----------|
|channel|[InputChannel](../types/InputChannel.md) | Optional|
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|username|[string](../types/string.md) | 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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### Errors this method can return:
| Error | Description |
|----------|---------------|
|CHANNEL_INVALID|The provided channel is invalid|
|CHAT_ID_INVALID|The provided chat id is invalid|
|USERNAME_INVALID|The provided username is not valid|
### Example:
```
$MadelineProto = new \danog\MadelineProto\API();
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$MadelineProto->session = 'mySession.madeline';
if (isset($number)) { // Login as a user
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$MadelineProto->phone_login($number);
$code = readline('Enter the code you received: '); // Or do this in two separate steps in an HTTP API
$MadelineProto->complete_phone_login($code);
}
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$Bool = $MadelineProto->channels->checkUsername(['channel' => InputChannel, 'username' => 'string', ]);
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```
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Or, if you're using the [PWRTelegram HTTP API](https://pwrtelegram.xyz):
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### As a user:
POST/GET to `https://api.pwrtelegram.xyz/userTOKEN/channels.checkUsername`
Parameters:
channel - Json encoded InputChannel
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username - Json encoded string
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Or, if you're into Lua:
```
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Bool = channels.checkUsername({channel=InputChannel, username='string', })
```