default discord command bot

server.js

//include library
const { Client, GatewayIntentBits, SlashCommandBuilder, Routes } = require('discord.js');
const { REST } = require('@discordjs/rest');
const client = new Client({ intents: [GatewayIntentBits.Guilds] });

// map command list
const commands = [
  new SlashCommandBuilder().setName('ping').setDescription('Replies with pong!')
].map(command => command.toJSON());

// regsiter command
const rest = new REST({ version: '10' }).setToken(process.env.token);
rest.put(Routes.applicationGuildCommands(process.env.clientId, process.env.guildId), { body: commands })
	.then(() => console.log('Successfully registered application commands.'))
	.catch(console.error);

//reply command
client.once('ready', () => {
	console.log('Ready!');
});

client.on('interactionCreate', async interaction => {
	if (!interaction.isChatInputCommand()) return;

	const { commandName } = interaction;

	if (commandName === 'ping') {
		await interaction.reply('Pong!');
	}
});

client.login(process.env.token);