create-command.js

const { REST, Routes } = require('discord.js');
const { SlashCommandBuilder } = require('discord.js');

const { clientId, guildId, token } = require('./config.json');
const fs = require('node:fs');
const path = require('node:path');

var convertCommand = new SlashCommandBuilder().setName('convert').setDescription('Convert measurements between metric and imperial.').toJSON();

const commands = [convertCommand];
// Grab all the command files from the commands directory you created earlier

// Construct and prepare an instance of the REST module
const rest = new REST().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.applicationCommands(clientId),
			{ 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);
	}
})();