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Showing content from https://developer.mozilla.org/en-US/docs/Web/API/FileReaderSync/readAsDataURL below:

FileReaderSync: readAsDataURL() method - Web APIs

FileReaderSync: readAsDataURL() method

Baseline Widely available

Note: This feature is only available in Web Workers, except for Service Workers.

The readAsDataURL() method of the FileReaderSync interface allows to read File or Blob objects in a synchronous way into a string representing a data URL. This interface is only available in workers as it enables synchronous I/O that could potentially block.

Syntax Parameters
blob

The File or Blob to read.

Return value

A string representing the input data as a data URL.

Exceptions

The following exceptions can be raised by this method:

NotFoundError DOMException

Thrown if the resource represented by the DOM File or Blob cannot be found, e.g., because it has been erased.

SecurityError DOMException

Thrown if one of the following problematic situation is detected:

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 Browser compatibility See also

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