web api instance method

FileReaderSync: readAsDataURL() method

Available in 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

readAsDataURL(blob)

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:
  - the resource has been modified by a third party;
  - too many read operations 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

SpecificationsStandards references are available on the canonical MDN page.

Browser compatibility

Browser compatibilityCompatibility data is available on the canonical MDN page.