Minecraft Launcher Core

Currently only supports MC 1.7.3 and up.

A script that launches Minecraft using NodeJS. Supports Vanilla and Forge.

Installing

npm i minecraft-launcher-core

Usage

launcher.core Options

Parameter	Type	Description	Required
options.authorization	Object	The result from getAuth function, allows the client to login in online or offline mode.	True
options.clientPackage	String	Path to the client package zip file.	False
options.root	String	Path where you want the launcher to work in. like C:/Users/user/AppData/Roaming/.mc	True
options.os	String	windows, osx or linux	True
options.version.number	String	Minecraft version that is going to be launched.	True
options.version.type	String	Any string. The actual Minecraft launcher uses release and snapshot.	True
options.memory.max	String	Max amount of memory being used by Minectaft	True
options.forge.path	String	Path to Universal Forge Jar	False

launcher.authenticator Functions

getAuth

Parameter	Type	Description	Required
email	String	Email or username	True
password	String	Password for the Mojang account being used if online mode.	False

validate

Parameter	Type	Description	Required
access_token	String	Token being checked if it can be used to login with (online mode).	True

refreshAuth

Parameter	Type	Description	Required
access_token	String	Token being checked if it can be used to login with (online mode).	True
client_token	String	Token being checked if it's the same client that the access_token was created from.	True
selected_profile	Object	Json Object that was returned from Mojangs auth api.	True

Events

Event Name	Type	Description
data	Buffer	Emitted when information is returned from the Minecraft Process
close	Integer	Code number that is returned by the Minecraft Process
error	String	Emitted when the Minecraft Process errors
package-extract	null	Emitted when clientPackage finishes being extracted
start	null	Emitted after launchArguments are set. THIS WILL BE DEPRECATED AS ITS NOT ACCURATE

Client Package Function

Client Packages allow the client to run offline on setup. This function should be used outside the actual launcher. this function is in the handler component.

makePackage

Parameter	Type	Description	Required
versions	Array	Array of the versions being downloaded and being made into a package.	True
os	String	OS that the package will be loaded on. OS specific natives need this.	True

Examples

const launcher = require('minecraft-launcher-core');

launcher.authenticator.getAuth("email", "password").then(auth => {
    // Save the auth to a file so it can be used later on!
    launcher.core({
        authorization: auth,
        clientPackage: null,
        forge: null,
        root: "C:/Users/user/AppData/Roaming/.mc",
        os: "windows",
        version: {
            number: "1.13.2",
            type: "MCC-Launcher" 
        },
        memory: {
            max: "500"
        }
    });
});

Using Validate and Refresh

let auth = require("pathToUserAuthJson.json");

const validateCheck = await launcher.authenticator.validate(auth.access_token);
if(!validateCheck) {
    auth = await launcher.authenticator.refreshAuth(auth.access_token, auth.client_token, auth.selected_profile);
}
launcher.core({
    authorization: auth,
    clientPackage: null,
    root: "directory",
    os: "windows",
    version: {
        number: "1.13.2",
        type: "MCC-Launcher"
    },
    memory: {
        max: "500"
    }
});

Using With Forge

launcher.authenticator.getAuth("email", "password").then(auth => {
    launcher.core({
        authorization: auth,
        clientPackage: null,
        root: "C:/Users/user/AppData/Roaming/.mc",
        forge: {
            path: "C:/Users/user/Desktop/forge.jar"
        },
        os: "windows",
        version: {
            number: "1.12.2", // needs to be the same as the Forge version
            type: "MCC-Launcher" 
        },
        memory: {
            max: "500"
        }
    });
});

What should it look like running from console?