index.js

+const { Client, Intents } = require('discord.js');
+
+const client = new Client({ intents: [Intents.FLAGS.GUILDS] });
+
+client.on('ready', () => {
+    console.log(`Logged in as ${client.user.tag}!`);
+});
+
+client.on('message', msg => {
+    if (msg.content === 'ping') {
+        msg.reply('Pong!');
+    }
+});
+
+client.login('token');
\ No newline at end of file