Mimetype Aliases¶

Nextcloud allows you to create aliases for mimetypes, so that you can display custom icons for files. For example, you might want a nice audio icon for audio files instead of the default file icon.

By default Nextcloud is distributed with nextcloud/resources/config/mimetypealiases.dist.json. Do not modify this file, as it will be replaced when Nextcloud is updated. Instead, create your own nextcloud/config/mimetypealiases.json file with your custom aliases. Use the same syntax as in nextcloud/resources/config/mimetypealiases.dist.json.

Once you have made changes to your mimetypealiases.json, use the occ command to propagate the changes through the system. This example is for Ubuntu Linux:

$ sudo -u www-data php occ maintenance:mimetype:update-js

See Using the occ Command to learn more about occ.

Some common mimetypes that may be useful in creating aliases are:

image: Generic image
image/vector: Vector image
audio: Generic audio file
x-office/document: Word processed document
x-office/spreadsheet: Spreadsheet
x-office/presentation: Presentation
text: Generic text document
text/code: Source code