The FileReaderSync
interface allows to read File
or Blob
objects synchronously.
Note: This feature is available in Web Workers
Warning: This interface is only available in workers as it enables synchronous I/O that could potentially block.
The FileReaderSync
interface allows to read File
or Blob
objects synchronously.
Note: This feature is available in Web Workers
Warning: This interface is only available in workers as it enables synchronous I/O that could potentially block.
This interface does not have any properties.
FileReaderSync.readAsArrayBuffer()
This method converts a specified Blob
or a File
into an ArrayBuffer
representing the input data as a binary string.
FileReaderSync.readAsBinaryString()
Deprecated
This method converts a specified Blob
or a File
into a DOMString
representing the input data as a binary string. This method is deprecated, consider using readAsArrayBuffer()
instead.
FileReaderSync.readAsText()
This method converts a specified Blob
or a File
into a DOMString
representing the input data as a text string. The optional encoding
parameter indicates the encoding to be used (e.g., iso-8859-1 or UTF-8). If not present, the method will apply a detection algorithm for it.
FileReaderSync.readAsDataURL()
This method converts a specified Blob
or a File
into a DOMString
representing the input data as a data URL.
Specification |
---|
File API # FileReaderSync |
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
FileReaderSync |
7
|
12
|
8
|
10
|
≤12.1
|
6
|
4.4
|
18
|
8
|
≤12.1
|
6
|
1.0
|
FileReaderSync |
7
|
12
|
8
|
10
|
≤12.1
|
6
|
4.4
|
18
|
8
|
≤12.1
|
6
|
1.0
|
readAsArrayBuffer |
7
|
12
|
8
|
10
|
≤12.1
|
6
|
4.4
|
18
|
8
|
≤12.1
|
6
|
1.0
|
readAsBinaryString |
7
|
12
|
8
|
11
|
15
|
6
|
4.4
|
18
|
8
|
14
|
6
|
1.0
|
readAsDataURL |
7
|
12
|
8
|
10
|
≤12.1
|
6
|
4.4
|
18
|
8
|
≤12.1
|
6
|
1.0
|
readAsText |
7
|
12
|
8
|
10
|
≤12.1
|
6
|
4.4
|
18
|
8
|
≤12.1
|
6
|
1.0
|
worker_support |
7
From Chrome 59, not supported in service workers.
|
12
Not supported in service workers.
|
8
From Firefox 61, not supported in service workers.
|
10
|
≤15
From Opera 46, not supported in service workers.
|
6
Not supported in service workers.
|
≤37
From version 59, not supported in service workers.
|
18
From Chrome 59, not supported in service workers.
|
8
From Firefox 61, not supported in service workers.
|
≤14
From Opera 43, not supported in service workers.
|
6
Not supported in service workers.
|
1.0
From version 7.0, not supported in service workers.
|
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https://developer.mozilla.org/en-US/docs/Web/API/FileReaderSync