Readable byte streams

A ReadableStream constructed with { type: "bytes" } reads bytes from a stream without making extra copies, improving efficiency for streams of large chunks. Also known as BYOB or bring your own buffer.

Baseline Status: Achieved Newly Available on Mar 24, 2026 across core engines.

Desktop Browser Engine Support

Google Chrome

89

Supported

Mozilla Firefox

102

Supported

Apple Safari

26.4

Supported

Microsoft Edge

89

Supported

Mobile Browser Engine Support

Chrome Android

89

Firefox Android

102

Safari iOS

26.4

Specifications and References

Specification ↗ Can I Use (streams) ↗ Feature XML ↗

MDN Browser Compat Data Keys: