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


var data =;


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


myWorker.onmessage = function(e) {
  result.textContent =;
  console.log('Message received from worker');


Specification Status Comment
HTML Living Standard
The definition of 'MessageEvent: data' in that specification.
Living Standard

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.