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.

Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.

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.

Instance properties

name Read only Non-standard Deprecated

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 Non-standard Deprecated

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