MadelineProto/docs/TD_docs/methods/getFileExtension.md

---
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

### Parameters:

| Name     |    Type       | Required | Description |
|----------|---------------|----------|-------------|
|mime\_type|[string](../types/string.md) | Yes|Mime type of the file|


### Return type: [Text](../types/Text.md)
docufix 2017-12-21 21:08:25 +01:00			`---`
			`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`

Documentation rework (#349) * Documentation rework * Apply fixes from StyleCI * Documentation fixes * Login as bot through web/cli API, allow using invite links in joinChannel, full invite links in importChatInvite and checkChatInvite, non-invite links in importChatInvite * Apply fixes from StyleCI * Logging fixes * Build docs * Add methods to modify start template, bugfix to logging and keyboard conversion * Add TL documentator * Document MTProto methods * Documenting methods... * 7% documented * Bugfixes * Update docs * Update docs * Simplify file management * Implement automatic object conversion for media, and more awesome stuff * Implement automatic object conversion for media, and more awesome stuff * Implement event update handler and file upload/download callback * Auto-detect mime type, duration, width and height of media * Update docs * Document new file functions * Fix links * Fix links * Update bot.php to use event loop * Implement webhook update handler and forking in main loop * Build docs * Better docs * Fixes to secret chats * Almost finished updating docs * Bugfixes, implemented infinite loop for loop() method, almost finished docs * Finish writing docs * Add automatic documentation builder script * Finished writing docs 2018-03-20 12:48:05 +01:00			`### Parameters:`
docufix 2017-12-21 21:08:25 +01:00
			`\| Name \| Type \| Required \| Description \|`
			`\|----------\|---------------\|----------\|-------------\|`
			`\|mime\_type\|[string](../types/string.md) \| Yes\|Mime type of the file\|`


			`### Return type: [Text](../types/Text.md)`