Blob: bytes() method
Baseline
2026
Newly available
Since January 2026, this feature works across the latest devices and browser versions. This feature might not work in older devices or browsers.
Note: This feature is available in Web Workers.
The bytes() method of the Blob interface returns a Promise that resolves with a Uint8Array containing the contents of the blob as an array of bytes.
Syntax
js
bytes()
Parameters
None.
Return value
A Promise that fulfills with a Uint8Array object containing the blob data.
Exceptions
The method will reject the returned Promise if, for example, the reader used to fetch the blob's data throws an exception.
Specifications
| Specification |
|---|
| File API # dom-blob-bytes |