Baseline Widely available
Note: This feature is only available in Web Workers, except for Service Workers.
The FileReaderSync
interface allows to read File
or Blob
objects synchronously. 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.
Instance methodsFileReaderSync.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.
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