MadelineProto/docs/TD_docs/methods/getFileExtension.md

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---
title: getFileExtension
description: Returns file's extension guessing only by its mime type. Returns empty string on failure. Offline method. Can be called before authorization. Can be called synchronously
---
## Method: getFileExtension
[Back to methods index](index.md)
YOU CANNOT USE THIS METHOD IN MADELINEPROTO
Returns file's extension guessing only by its mime type. Returns empty string on failure. Offline method. Can be called before authorization. Can be called synchronously
### Params:
| Name | Type | Required | Description |
|----------|---------------|----------|-------------|
|mime\_type|[string](../types/string.md) | Yes|Mime type of the file|
### Return type: [Text](../types/Text.md)