Non-standard: This feature is non-standard and is not on a standards track. Do not use it on production sites facing the Web: it will not work for every user. There may also be large incompatibilities between implementations and the behavior may change in the future.

In the File and Directory Entries API, a FileSystemSync object represents a file system. It has two properties.

Warning: This interface is deprecated and is no more on the standard track. Do not use it anymore. Use the File and Directory Entries API instead.

Basic concepts

The FileSystemSync object is your gateway to the entire API and you will use it a lot. So once you have a reference, cache the object in a global variable or class property.


name Read only

A string that represents the name of the file system. The name must be unique across the list of exposed file systems.

root Read only

A DirectoryEntry that is the root directory of the file system.


This feature is not part of any specification anymore. It is no longer on track to become a standard.

Browser compatibility

BCD tables only load in the browser

See also