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.

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

The Metadata interface contains information about a file system entry. This metadata includes the file's size and modification date and time.

Note: This interface isn't available through the global scope; instead, you obtain a Metadata object describing a FileSystemEntry using the method FileSystemEntry.getMetadata().

Instance properties

modificationTime Read only Experimental Non-standard

A Date object indicating the date and time the entry was modified.

size Read only Experimental Non-standard

A 64-bit unsigned integer indicating the size of the entry in bytes.


This feature has been removed from all specification and is not in the process of being standardized.

Browser compatibility

BCD tables only load in the browser

See also