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FileSystemEntry - Web APIs | MDN

The FileSystemEntry interface of the File and Directory Entries API represents a single entry in a file system. The entry can be a file or a directory (directories are represented by the FileSystemDirectoryEntry interface). It includes methods for working with files—including copying, moving, removing, and reading files—as well as information about a file it points to—including the file name and its path from the root to the entry.

You don't create FileSystemEntry objects directly. Instead, you will receive an object based on this interface through other APIs. This interface serves as a base class for the FileSystemFileEntry and FileSystemDirectoryEntry interfaces, which provide features specific to file system entries representing files and directories, respectively.

The FileSystemEntry interface includes methods that you would expect for manipulating files and directories, but it also includes a convenient method for obtaining the URL of the entry: toURL(). It also introduces a new URL scheme: filesystem:.

You can use the filesystem: scheme on Google Chrome to see all the files and folders that are stored in the origin of your app. Just use filesystem: scheme for the root directory of the origin of the app. For example, if your app is in http://www.example.com, open filesystem:http://www.example.com/temporary/ in a tab. Chrome shows a read-only list of all the files and folders stored the origin of your app.

To see an example of how toURL() works, see the method description. The snippet below shows you how you can remove a file by name.

// Taking care of the browser-specific prefixes.
window.requestFileSystem =
  window.requestFileSystem || window.webkitRequestFileSystem;

// …

// Opening a file system with temporary storage
window.requestFileSystem(
  TEMPORARY,
  1024 * 1024 /* 1MB */,
  (fs) => {
    fs.root.getFile(
      "log.txt",
      {},
      (fileEntry) => {
        fileEntry.remove(() => {
          console.log("File removed.");
        }, onError);
      },
      onError,
    );
  },
  onError,
);

This interface provides the following properties.

filesystem Read only

A FileSystem object representing the file system in which the entry is located.

fullPath Read only

A string which provides the full, absolute path from the file system's root to the entry; it can also be thought of as a path which is relative to the root directory, prepended with a "/" character.

isDirectory Read only

A boolean value which is true if the entry represents a directory; otherwise, it's false.

isFile Read only

A Boolean which is true if the entry represents a file. If it's not a file, this value is false.

name Read only

A string containing the name of the entry (the final part of the path, after the last "/" character).

This interface defines the following methods.

copyTo() Deprecated Non-standard

Copies the file or directory to a new location on the file system.

getMetadata() Deprecated Non-standard

Obtains metadata about the file, such as its modification date and size.

getParent()

Returns a FileSystemDirectoryEntry representing the entry's parent directory.

moveTo() Deprecated Non-standard

Moves the file or directory to a new location on the file system, or renames the file or directory.

remove() Deprecated Non-standard

Removes the specified file or directory. You can only remove directories which are empty.

toURL() Deprecated Non-standard

Creates and returns a URL which identifies the entry. This URL uses the URL scheme "filesystem:".

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