Ping.js

//Listen for message event
bot.on("message", async (message) {
    //Check if the content of the message is "ping"
    if (message.content === "ping") {
        //Set the time that the command was executed in a variable
        let now = Date.now()
        //Send a loading ping message and set it in a variable
        let m = await message.channel.send(`Pinging...`);
        //Edit the m variable (the message that was sent before) with the date of the edit of the message minus the created date of the message
        //Send too the api ping, by getting the bot.ping and roundig it to a whole number
        m.edit(`Pong! BOT PING : \`${Date.now() - now}\`ms\n API PING : ${Math.round(bot.ping)}ms``) //or bot.ws.ping (for v12 users)
    }
})