server.js

// Require Packages -- You will need to install these
const Discord = require('discord.js');
const client = new Discord.Client(); // This uses the discord.js package to setup a client

// Constant Variables
const prefix = '_'; // This can be changed to anything you want
const ownerID = 'yourID'; // This will be used in future videos

// Listener Events
client.on('message', message => {
    // This is run whenever a new message is created in a channel the bot has access to view
    
    // Variables
    let args = message.content.slice(prefix.length).trim().split(' ');
    let cmd = args.shift().toLowerCase();

    // Now, we have two variables. cmd contains the command following the prefix
    // args contains everything following that, split into an array by spaces

    // Return Statemets
    if (message.author.bot) return; // This will ignore all bots
    if (!message.content.startsWith(prefix)) return; // This will return if the message doesn't start with your prefix
    
    // Command Handler
    try {
    
        // Bonus: Auto-Reload (You should move this into it's own command)
        delete require.cache[require.resolve(`./commands/${cmd}.js`)];
 
        let commandFile = require(`./commands/${cmd}.js`); // This will require a file in the commands folder
        commandFile.run(client, message, args); // This will pass three variables into the file
        
	// We can create a basic ping-pong command for starters
	   
    } catch (e) { // This will catch any errors, either within the code or if the command doesn't exist
        console.log(e.stack);
    }
        

});

// Ready Event -- This will run whenever the turns on
client.on('ready', () => console.log('Launched!'));

// Discord Login -- Remember to use your own token, and to NEVER leak it
client.login(process.env.TOKEN); // This will be your token instead of process.env.TOKEN