MessageEvent: data property

The data read-only property of the MessageEvent interface represents the data sent by the message emitter.

Value

The data sent by the message emitter; this can be any data type.

If the data is sent by a WebSocket connector, the type of this property depends on the type of the WebSocket message and the value of WebSocket.binaryType.

  • If the message type is "text", then this field is a string.
  • If the message type is "binary" type, then the type of this property can be inferred from the binaryType of this socket:
    • ArrayBuffer if binaryType is "arraybuffer",
    • Blob if binaryType is "blob".

Examples

js

myWorker.onmessage = (e) => {
  result.textContent = e.data;
  console.log("Message received from worker");
};

Specifications

Specification
HTML Standard
# dom-messageevent-data-dev

Browser compatibility

BCD tables only load in the browser

See also

  • ExtendableMessageEvent — similar to this interface but used in interfaces that needs to give more flexibility to authors.