This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.

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.

The FileSystemEntry interface's method getMetadata() obtains a Metadata object with information about the file system entry, such as its modification date and time and its size.


FileSystemEntry.getMetadata(successCallback[, errorCallback]);


A function which is called when the copy operation is succesfully completed. Receives a single input parameter: a Metadata object with information about the file.
errorCallback Optional
An optional callback which is executed if an error occurs while looking up the metadata. There's a single parameter: a FileError describing what went wrong.

Return value



The FileSystemEntry refers to an item which doesn't exist.
Security restrictions prohibit obtaining the requested metadata.


This example checks the size of a log file in a temporary folder and, if it exceeds a megabyte, moves it into a different directory.

workingDirectory.getFile("tmp/log.txt", {}, function(fileEntry) {
  fileEntry.getMetadata(function(metadata) {
    if (metadata.size > 1048576) {
      workingDirectory.getDirectory("log", {}, function(dirEntry) {
      }, handleError);
}, handleError);


Specification Status Comment
File and Directory Entries API
The definition of 'getMetadata()' in that specification.
Editor's Draft Initial specification.

This API has no official W3C or WHATWG specification.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 13 webkit No support No support No support No support
Feature Android Chrome for Android Firefox Mobile (Gecko) IE Phone Opera Mobile Safari Mobile
Basic support No support 0.16webkit No support No support No support No support

See also


© 2016 Mozilla Contributors
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.

API File and Directory Entries API File System API Files FileSystemEntry getMetadata Method Non-Standard Non-standard Reference