Baseline Widely available
Note: This feature is available in Web Workers.
The File
interface provides information about files and allows JavaScript in a web page to access their content.
File
objects are generally retrieved from a FileList
object returned as a result of a user selecting files using the <input>
element, or from a drag and drop operation's DataTransfer
object.
A File
object is a specific kind of Blob
, and can be used in any context that a Blob can. In particular, the following APIs accept both Blob
s and File
objects:
FileReader
URL.createObjectURL()
Window.createImageBitmap()
and WorkerGlobalScope.createImageBitmap()
body
option to fetch()
XMLHttpRequest.send()
See Using files from web applications for more information and examples.
Blob File ConstructorFile()
Returns a newly constructed File
.
The File
interface also inherits properties from the Blob
interface.
File.lastModified
Read only
Returns the last modified time of the file, in millisecond since the UNIX epoch (January 1st, 1970 at Midnight).
File.lastModifiedDate
Deprecated Read only Non-standard
Returns the last modified Date
of the file referenced by the File
object.
File.name
Read only
Returns the name of the file referenced by the File
object.
File.webkitRelativePath
Read only
Returns the path the URL of the File
is relative to.
The File
interface also inherits methods from the Blob
interface.
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