CODE EXAMPLE FOR JAVASCRIPT

Discord.js v13 / command handler

const { REST } = require('@discordjs/rest');
const { Routes } = require('discord-api-types/v9');
const fs = require('fs');
const clientId = 'Your Client ID';
const guildId = 'Your Guild ID';

module.exports = (client) => {
    client.handlecommands = async (commandFolders, path) => {
        client.commandArray = [];
        for (folder of commandFolders) {
            const commandFiles = fs.readdirSync(`${path}/${folder}`).filter(file => file.endsWith('.js'));

            for (const file of commandFiles) {
                const command = require(`../(Your path to your commands)/${folder}/${file}`);
                client.commands.set(command.data.name, command);
                client.commandArray.push(command.data.toJSON());
            }
        }

        const rest = new REST({ version: '9' }).setToken(process.env.TOKEN);

        (async () => {
            try {
                console.log('Started refreshing application (/) commands.');

                await rest.put(
                    Routes.applicationGuildCommands(clientId, guildId),
                    { body: client.commandArray },
                );

                console.log('Successfully reloaded application (/) commands.');
            } catch (error) {
                console.error(error);
            }
        })();
         console.log(client.commandArray)
    }
}