PushMessageData: bytes() method

Baseline 2025

Newly available

Since January 2025, this feature works across the latest devices and browser versions. This feature might not work in older devices or browsers.

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Note: This feature is only available in Service Workers.

The bytes() method of the PushMessageData interface extracts push message data as a Uint8Array object.

Syntax

bytes()

None.

The returned Uint8Array is backed by an ArrayBuffer of bytes. Exceptions thrown during creation of this backing buffer are re-thrown.

js
self.addEventListener("push", (event) => {
  const buffer = event.data.bytes();

  // do something with your typed array
});

Specification

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This page was last modified on Nov 7, 2025 by MDN contributors.