index.js

const Discord = require('discord.js'); 
const client = new Discord.Client();
  
client.on('ready', () => {   
  console.log(`Logged in as ${client.user.tag}!`); 
});  

const axios = require('axios');
const countries = require("./countries.json");
const url = 'https://api.covid19api.com/total/country/';
const WAKE_COMMAND = '!cases';
client.on('message', async (msg) => {
  const content = msg.content.split(/[ ,]+/);
  if(content[0] === WAKE_COMMAND){
    if(content.length > 2){
      msg.reply("Too many arguments...")
    }
    else if(content.length === 1){
      msg.reply("Not enough arguments")
    }
    else if(!countries[content[1]]){
      msg.reply("Wrong country format")
    }
    else{
      const slug = content[1]
      const payload = await axios.get(`${url}${slug}`)
      const covidData = payload.data.pop();
      msg.reply(`Confirmed: ${covidData.Confirmed}, Deaths: ${covidData.Deaths}, Recovered: ${covidData.Recovered}, Active: ${covidData.Active} `)
    }
  }
});

client.login('token');