MCPE/Win10 WebSocket JSON Messages

CommandRequest.js

// For more information about available commands, look at the commands/standard.json file in the game's assets.

{
    "body": {
        "input": {}, // Command inputs go here
        "origin": {
            "type": "player" // Where the command originates from
        },
        "name": "name-of-command", // Command name goes here (i.e. for /say, enter "say")
        "version": 1,
        "overload": "default" // If the command has additional overloads defined, you can specify it here
    },
    "header": {
        "requestId": "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
        "messagePurpose": "commandRequest", // Note that both messagePurpose and messageType are "commandRequest"
        "version": 1,
        "messageType": "commandRequest"
    }
}

CommandResponse.js

// Note: the body for this command usually has extra data, but that data looks different for each command

{
    "body": {
        "statusCode": 0, // Whether the command executed successfully, or if an error occured
        "statusMessage": "response message" // Some command reponses may not have a status message
    },
    "header": {
        "messagePurpose": "commandResponse", // Notice there is no messageType
        "requestId": "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
        "version": 1
    }
}

Error.js

{
    "body": {
        "statusMessage": "", // Indicates what the error is
        "statusCode": -2147483647 // Indicates the error type
    },
    "header": {
        "messagePurpose": "error", // Notice there is no messageType
        "requestId": "xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx",
        "version": 1
    }
}

Event.js

{
    "body": {
        "eventName": "name-of-event", // The name of the event being responded to
        "measurements": null, // No idea what this does...
        "properties": { // Additional details about the event and client
        }
    },
    "header": {
        "messagePurpose": "event", // Notice there is no messageType
        "requestId": "00000000-0000-0000-0000-000000000000", // UUID always seems to be all zeros
        "version": 1
    }
}

Subscribe.js

// To see a list of known event names, look at: https://gist.github.com/jocopa3/5f718f4198f1ea91a37e3a9da468675c

{
    "body": {
        "eventName": "NameOfEvent" // Event to subscribe to
    },
    "header": {
        "requestId": "xxxxxxxx-xxxx-xxxx-xxxxxxxxxxxxxxxxx",
        "messagePurpose": "subscribe", // Notice that messagePurpose is different from messageType
        "version": 1,
        "messageType": "commandRequest"
    }
}

Unsubscribe.js

// To see a list of known event names, look at: https://gist.github.com/jocopa3/5f718f4198f1ea91a37e3a9da468675c

{
    "body": {
        "eventName": "NameOfEvent" // Event to unsubscribe to
    },
    "header": {
        "requestId": "xxxxxxxx-xxxx-xxxx-xxxxxxxxxxxxxxxxx",
        "messagePurpose": "unsubscribe", // Notice that messagePurpose is different from messageType
        "version": 1,
        "messageType": "commandRequest"
    }
}