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Creating a Moderation Bot for Discord

Published at

12/6/2024

Creating a Moderation Bot for Discord

In this guide, we’ll create a simple moderation bot for Discord using Node.js and the Discord.js library. This bot will include features like banning, muting, and monitoring chat activity.

Prerequisites

Node.js Installed: Download and install Node.js from nodejs.org.
Discord Account: Ensure you have a Discord account and administrative access to the server where you’ll test the bot.
Basic JavaScript Knowledge: Familiarity with JavaScript basics is recommended.

Step 1: Create a New Discord Bot

Go to the Discord Developer Portal.
Click New Application and give your bot a name.
In the left sidebar, go to Bot and click Add Bot.
Copy the bot’s Token for later use (keep it private).
Under "Privileged Gateway Intents," enable MESSAGE CONTENT INTENT to allow the bot to read messages.

Step 2: Set Up Your Project

Open a terminal and create a new folder for your bot:

   mkdir discord-moderation-bot
   cd discord-moderation-bot

Initialize a new Node.js project:

   npm init -y

Install Discord.js:

   npm install discord.js

Create an index.js file in the folder to hold your bot’s code:

   touch index.js

Step 3: Write the Bot Code

Open index.js in a code editor and add the following code:

1. Import and Configure Discord.js

const { Client, GatewayIntentBits } = require('discord.js');
const client = new Client({
    intents: [
        GatewayIntentBits.Guilds,
        GatewayIntentBits.GuildMessages,
        GatewayIntentBits.MessageContent,
        GatewayIntentBits.GuildMembers
    ]
});

const TOKEN = 'YOUR_BOT_TOKEN'; // Replace with your bot token

2. Set Up Bot Login and Ready Event

client.once('ready', () => {
    console.log(`Logged in as ${client.user.tag}!`);
});

client.login(TOKEN);

3. Add Moderation Commands

Ban Command

client.on('messageCreate', (message) => {
    if (message.content.startsWith('!ban')) {
        if (!message.member.permissions.has('BanMembers')) {
            return message.reply('You do not have permission to ban members.');
        }

        const member = message.mentions.members.first();
        if (!member) {
            return message.reply('Please mention a user to ban.');
        }

        member.ban()
            .then(() => message.reply(`${member.user.tag} has been banned.`))
            .catch((err) => message.reply('I was unable to ban the member.'));  
    }
});

Mute Command

client.on('messageCreate', (message) => {
    if (message.content.startsWith('!mute')) {
        if (!message.member.permissions.has('ManageRoles')) {
            return message.reply('You do not have permission to mute members.');
        }

        const member = message.mentions.members.first();
        if (!member) {
            return message.reply('Please mention a user to mute.');
        }

        let muteRole = message.guild.roles.cache.find(role => role.name === 'Muted');
        if (!muteRole) {
            return message.reply('No "Muted" role found. Please create one first.');
        }

        member.roles.add(muteRole)
            .then(() => message.reply(`${member.user.tag} has been muted.`))
            .catch((err) => message.reply('I was unable to mute the member.'));  
    }
});

Clear Messages Command

client.on('messageCreate', (message) => {
    if (message.content.startsWith('!clear')) {
        if (!message.member.permissions.has('ManageMessages')) {
            return message.reply('You do not have permission to manage messages.');
        }

        const args = message.content.split(' ');
        const amount = parseInt(args[1]);

        if (isNaN(amount) || amount <= 0) {
            return message.reply('Please specify a valid number of messages to delete.');
        }

        message.channel.bulkDelete(amount, true)
            .then((deletedMessages) => message.reply(`Deleted ${deletedMessages.size} messages.`))
            .catch((err) => message.reply('I was unable to delete messages.'));  
    }
});

Step 4: Invite the Bot to Your Server

Go back to the Discord Developer Portal.
In the left sidebar, click OAuth2 > URL Generator.
Under Scopes, select bot. Under Bot Permissions, select:
- Ban Members
- Manage Roles
- Manage Messages
Copy the generated URL and paste it into your browser to invite the bot to your server.

Step 5: Test Your Bot

Run the bot:

   node index.js

In your Discord server, try using the following commands:
- !ban @user to ban a user.
- !mute @user to mute a user (ensure a "Muted" role exists).
- !clear <number> to delete a specified number of messages.

Additional Tips

Improve Error Handling: Add better logging and user feedback for errors.
Add a Help Command: Provide users with a list of commands and their descriptions.
Secure Your Bot Token: Use environment variables or a configuration file to keep your token safe.
Expand Features: Add warnings, unmute, or even automatic spam detection using a message tracker.

With this guide, you have a fully functional moderation bot that you can customize to suit your server’s needs!

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