XPBot.js

const Discord = require("discord.js");
const bot = new Discord.Client();
const fs = require('fs');
let XP = JSON.parse(fs.readFileSync('./XP.json', 'utf8'));

bot.on("message", msg => {
	let prefix = "!";
	
	console.log(0)
	if(!msg.content.startsWith(prefix)) return;
	
	//console.log(0.1)
	//if(msg.author.id != "Your ID") return;
	//Only use the above for testing as only the person with that ID can use the bot.
	
	console.log("help command")
	if (msg.content.startsWith(prefix + "help")) {
		msg.reply("Here are my commands: !help,")
	}
	
	let userData = XP[msg.author.id];
	if (!userData) userData = {XP: 0, level: 0};
	
	let userXP = XP[msg.author.id] ? XP[msg.author.id].XP : 0;
	let curLevel = Math.floor(0.1 * Math.sqrt(userXP));
	if (curLevel > userData.level) {
		userData.level = curLevel;
		msg.reply(`You have lvled ^ to lvl **${curLevel}**!`);
	}
	
	console.log("level")
	if (msg.content.startsWith(prefix + "level")) {
		msg.reply(`You are lvl ${userData.level}, with ${userData.XP} XP Right Now.`);
	}
	
	if (!XP[msg.author.id]) XP[msg.author.id] = {XP: 0, level: 0}
	
	
	
	console.log("Example")
	if (msg.content.startsWith(prefix + "killExample")) {
		userData.XP += 10
		msg.channel.sendMessage(`${msg.author} has killed an Example!`)
	}
	
	console.log(XP)
	fs.writeFile('./XP.json', JSON.stringify(XP), console.error);
	
});
bot.login("Your Bot's Login Token!")