CODE EXAMPLE FOR JAVASCRIPT

discord.js

const Discord = require("discord.js");
const client = new Discord.Client({
	intents: [Discord.Intents.FLAGS.GUILDS, Discord.Intents.FLAGS.GUILD_MEMBERS, Discord.Intents.FLAGS.GUILD_BANS, Discord.Intents.FLAGS.GUILD_MESSAGES, Discord.Intents.FLAGS.DIRECT_MESSAGES]
});

client.on("messageCreate" message => {
if(message.content = "!ping" {
	message.channel.send("pong!")
  }
})

client.on('interaction', async interaction => {
	if (!interaction.isCommand()) return;
	if (interaction.commandName === 'ping') {
		await interaction.reply('Pong!');
	}
});


client.on('ready', () => {
  console.log(`Logged in as ${client.user.tag}!`);
});

client.login('YOUR_TOKEN')