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Responses are messages sent by Galaxy to the game, either as a certain message event or as a response to a previous action. To handle responses, attach an event listener for the message event to the game’s window:

window.addEventListener("message", e => {
	if (e.origin === "") {
		// It's a message from Galaxy!
		const data =;
		// Additional code goes here...
	} else {
		// It may be an impostor! Probably best to ignore it.

Here is an example of a possible response:

	type: "saved",
	error: false,
	slot: 0,

The response object will always contain a type property describing which type of response it is, and then certain additional properties that are included depending on the type of response. Below is a list of response types that are used by Galaxy: