For some reason, the basic ping pong command isn't working. I copied and pasted it from a website, but I am not sure what is wrong with it.

const { Client, Intents } = require('discord.js');
    const client = new Client({ intents: [Intents.FLAGS.GUILDS, Intents.FLAGS.GUILD_MESSAGES] });
    client.login('hidden')



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

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

    const { commandName } = interaction;

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

});

There is no log error which makes it weirder. I know it is connecting because the bot appears online when I do a node index.js in the cmd panel.