deploy-commands.js

const { REST, Routes } = require('discord.js')
const { clientId, guildId, token } = require('./config.json')
const fs = require('node:fs')

const commands = []
// Grab all the command files from the commands directory you created earlier
const commandFiles = fs
    .readdirSync('./commands')
    .filter((file) => file.endsWith('.js'))

// Grab the SlashCommandBuilder#toJSON() output of each command's data for deployment
for (const file of commandFiles) {
    const command = require(`./commands/${file}`)
    commands.push(command.data.toJSON())
}

// Construct and prepare an instance of the REST module
const rest = new REST({ version: '10' }).setToken(token)

// and deploy your commands!
;(async () => {
    try {
        console.log(
            `Started refreshing ${commands.length} application (/) commands.`
        )

        // The put method is used to fully refresh all commands in the guild with the current set
        const data = await rest.put(
            Routes.applicationGuildCommands(clientId, guildId),
            { body: commands }
        )

        console.log(
            `Successfully reloaded ${data.length} application (/) commands.`
        )
    } catch (error) {
        // And of course, make sure you catch and log any errors!
        console.error(error)
    }
})()