FileReaderSync: readAsBinaryString() method
Deprecated: This feature is no longer recommended. Though some browsers might still support it, it may have already been removed from the relevant web standards, may be in the process of being dropped, or may only be kept for compatibility purposes. Avoid using it, and update existing code if possible; see the compatibility table at the bottom of this page to guide your decision. Be aware that this feature may cease to work at any time.
Note: This method is deprecated in favor of readAsArrayBuffer()
.
The readAsBinaryString()
method of the FileReaderSync
interface allows to read File
or Blob
objects in a synchronous way into a string. This interface is only available in workers as it enables synchronous I/O that could potentially block.
Syntax
js
readAsBinaryString(File)
readAsBinaryString(Blob)
Parameters
Return value
A string representing the input data.
Exceptions
NotFoundError
DOMException
-
Thrown if the resource represented by the DOM
File
orBlob
cannot be found, e.g. because it has been erased. SecurityError
DOMException
-
Thrown if one of the following problematic situation is detected:
- the resource has been modified by a third party;
- too many read are performed simultaneously;
- the file pointed by the resource is unsafe for a use from the Web (like it is a system file).
NotReadableError
DOMException
-
Thrown if the resource cannot be read due to a permission problem, like a concurrent lock.
EncodingError
DOMException
-
Thrown if the resource is a data URL and exceed the limit length defined by each browser.
Specifications
Specification |
---|
File API # readAsBinaryStringSyncSection |
Browser compatibility
BCD tables only load in the browser