Unable to integrate Discord with Nodejs

Question

I am working with Nodejs and Discord Bot,Right now i am trying to integrate Discord but i am getting following error

rawError: { message: '401: Unauthorized', code: 0 },

Here is my code,How can i fix this ?

const { REST } = require('@discordjs/rest');
const { Routes } = require('discord.js');

const commands = [
  {
    name: 'ping',
    description: 'Replies with Pong!',
  },
];

const rest = new REST({ version: '10' }).setToken('token');

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

    await rest.put(Routes.applicationGuildCommands(CLIENT_ID, GUILD_ID), { body: commands });

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

Reference site

https://github.com/discordjs/discord.js