Nodejs script that allows the user to access the websocket stream of the lcu. Works assuming the League of Legends client is running on the computer

lcu_websocket.js

const websocket = require("ws");
const { exec } = require("child_process");

process.env.NODE_TLS_REJECT_UNAUTHORIZED = 0;

exec('WMIC PROCESS get Caption,Commandline', {maxBuffer: 1024 * 500}, (err, stdout, stderr) => {
	if(err) {
		console.log(err);
		return;
	}

	var lines = stdout.split('\n');
	var result = '';
	var _break = false;
	lines.every(function(line, index) {
		if(line.indexOf('LeagueClientUx.exe') > -1) {
			result = line.replace(' +', ' ').replace(/|\s+$/g, '');
			_break = true;;
		}
		if(_break) return false;
		else return true;
	});

	if(result != '' || result != null || result != ' ') {
		let token = result.match(/\"--remoting-auth-token=(\S+)\"/)[1];
		let port = parseInt(result.match(/\"--app-port=(\S+)\"/)[1]);
	
		const ws = new websocket('wss://riot:' + token + '@127.0.0.1:' + port.toString(), {
			headers: {
				Authorization: 'Basic ' + Buffer.from('riot:' + token).toString('base64'),
			},
			rejectUnauthorized: false,
		});

		ws.on('open', () => {
			console.log("=== Open ===");
			ws.send(JSON.stringify([5, 'OnJsonApiEvent']));
		});

		ws.on('message', data => {
			if(data != null || data != '' || data != ' ') {
				console.log(data);
			}
		});

		ws.on('close', () => {
			console.log("=== Closing ===");
		});

		ws.on('error', err => {
			console.log("Error:", err);
		});

	}
});