This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

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.
Draft Initial specification.

This API has no official W3C or WHATWG specification.

Browser compatibility

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support13 ? No No No No
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support Yes Yes ? No No No ?

See also

Document Tags and Contributors

Contributors to this page: fscholz, Sheppy
Last updated by: fscholz,