once,ready discord.js with bot name code example

Example 1: discord js ping command

// If the command sent in the chat is "ping"
if(cmd === `${prefix}ping `) {
  
  // It sends the user "Pinging"
        message.channel.send("Pinging...").then(m =>{
          // The math thingy to calculate the user's ping
            var ping = m.createdTimestamp - message.createdTimestamp;

          // Basic embed
            var embed = new Discord.MessageEmbed()
            .setAuthor(`Your ping is ${ping}`)
            .setColor("Your Color")
            
            // Then It Edits the message with the ping variable embed that you created
            m.edit(embed)
        });
    }

Example 2: discord.js start

const Discord = require('discord.js');
const client = new Discord.Client();
const token = 'YOUR TOKEN HERE'; // For get a token , go here https://discord.com/developers/applications

client.login(token);