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WebSocket: binaryType property

The WebSocket.binaryType property controls the type of binary data being received over the WebSocket connection.

Value

A string:

"blob"

Use Blob objects for binary data. This is the default value.

"arraybuffer"

Use ArrayBuffer objects for binary data.

Examples

js

// Create WebSocket connection.
const socket = new WebSocket("ws://localhost:8080");

// Change binary type from "blob" to "arraybuffer"
socket.binaryType = "arraybuffer";

// Listen for messages
socket.addEventListener("message", (event) => {
  if (event.data instanceof ArrayBuffer) {
    // binary frame
    const view = new DataView(event.data);
    console.log(view.getInt32(0));
  } else {
    // text frame
    console.log(event.data);
  }
});

Specifications

Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
binaryType 15 12 11 10 12.1 6 4.4 18 14 12.1 6 1.0

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https://developer.mozilla.org/en-US/docs/Web/API/WebSocket/binaryType