Making Discord bot commands resistant to letter case

Other Questions Discord bot
1

How to Make Commands Case-Insensitive in Discord Bot

I’m developing a Discord bot, and I’m encountering a challenge regarding command recognition. Currently, it seems that my bot only reacts when commands are typed with the exact case. For instance, if a user types +help instead of +Help, the bot doesn’t respond as expected.

Here’s the code that I’m currently using for my bot:

const Discord = require('discord.js');
const bot = new Discord.Client();
const cmdPrefix = '+';

bot.once('ready', () => {
    console.log('Bot is now running!');
});

bot.on('message', msg => {
    const args = msg.content.slice(cmdPrefix.length).split(/ +/);
    
    // Username command
    if (msg.content.toLowerCase() === `${cmdPrefix}username`) {
        const userEmbed = new Discord.MessageEmbed()
            .setTitle('User Information')
            .addField('Your Username:', msg.author.username)
            .addField('Bugs', 'For bug reporting, please reach out to TxPsycho#1080')
            .setThumbnail(msg.author.displayAvatarURL())
            .setFooter('For Valorant cheats, join us!')
            .setColor('RANDOM');
        msg.channel.send(userEmbed);
    }
    
    // Help command
    if (msg.content.toLowerCase() === `${cmdPrefix}help`) {
        const helpEmbed = new Discord.MessageEmbed()
            .setTitle('Help Commands')
            .addField('Available Commands', 'Here’s a list of commands you can use!')
            .setThumbnail(msg.author.displayAvatarURL())
            .setDescription('This bot is designed to assist with server operations.')
            .setColor('RANDOM');
        msg.channel.send(helpEmbed);
    }
});

bot.login('your_token_here');

What changes can I make so that all variations of the commands like +info, +INFO, and +Info will trigger the same response?

2

I see the problem. You’re checking for exact command matches after toLowerCase(), but you’re slicing the content for args without using them for comparison. Extract the command separately: const command = args[0].toLowerCase(); then check if (command === 'username') instead of comparing the whole message. Way more flexible and handles edge cases better. Had the same issue when I started - this fixed my inconsistent command recognition.

3

you’re already using toLowerCase() on msg.content so that should work. maybe there’s extra spaces after the command? try msg.content.toLowerCase().trim() instead.

4

Your problem is using toLowerCase() on the whole message but comparing against the full string with prefix. Users add extra characters and spacing, which breaks things. I fixed this by normalizing only the command part after stripping the prefix. Use const command = msg.content.slice(cmdPrefix.length).toLowerCase().trim(); then check if (command === 'username') or if (command === 'help'). This separates prefix handling from command matching and handles user input variations way better.