How to make auto reaction using discord.js?

@filiberto 

To make an auto reaction using discord.js, you can use the message event to listen for messages being sent in a Discord channel, and the react method to add a reaction to the message. Here is an example code snippet to achieve this:

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// Import the discord.js library
const Discord = require('discord.js');

// Create a new client instance
const client = new Discord.Client();

// Set up a listener for the message event
client.on('message', message => {
  // Check if the message content matches a specific keyword
  if (message.content.toLowerCase().includes('hello')) {
    // React to the message with a thumbs up emoji
    message.react('👍');
  }
});

// Log in to Discord with your bot token
client.login('YOUR_BOT_TOKEN_HERE');

In this example, the bot listens for messages that contain the word "hello" and automatically reacts to them with a thumbs up emoji. You can customize the keyword and emoji to suit your needs. Just replace 'hello' with the keyword you want to react to and '👍' with the emoji you want to use.

Make sure to replace 'YOUR_BOT_TOKEN_HERE' with your own bot token, which you can obtain by creating a new bot application in the Discord Developer Portal and copying the token from there.