TheOchulus/commands/testing/avatar.js

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

module.exports = {
    data: new SlashCommandBuilder()
        .setName('avatar')
        .setDescription('Get the avatar URL of the selected user, or your own avatar.')
        .addUserOption(option => option.setName('user').setDescription('The user\'s avatar to show')),

    async execute(interaction) {
        const user = interaction.options.getUser('user');
        if (user) return interaction.reply(`${user.username}'s avatar: ${user.displayAvatarURL()}`);
        return interaction.reply(`Your avatar: ${interaction.user.displayAvatarURL()}`);
    },
};