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.
FileReaderSync()Returns a new FileReaderSync object.
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 string 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 string 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 string 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 |
9 | 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 | 12 | 8 | 10 | ≤15 | 6 | 4.4 | 18 | 8 | ≤14 | 6 | 1.0 |
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https://developer.mozilla.org/en-US/docs/Web/API/FileReaderSync