FileReaderSync: FileReaderSync() constructor

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

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

The FileReaderSync() constructor creates a new FileReaderSync.

Syntax

new FileReaderSync()

None.

The following code snippet shows creation of a FileReaderSync object using the FileReaderSync() constructor and subsequent usage of the object:

js
function readFile(blob) {
  const reader = new FileReaderSync();
  postMessage(reader.readAsDataURL(blob));
}

Note: This snippet must be used inside a Worker, as synchronous interfaces can't be used on the main thread.

Specification

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This page was last modified on Jul 26, 2024 by MDN contributors.