Develop Reference

Discord.js - Deleting a specific channel

I'm actually making a discord bot with discord.js, and I was wondering how to do a command to delete a specific channel with a name
ex : !delete #general
I already tried to do the following:
if (command == "delete") {
channel.delete(args.join(" "))
}
but it doesn't work so I'm kinda stuck
thank you

You have to use the .delete method to delete a guild textchannel.
I added a new variable fetchedChannel which tries to fetch the channel by its name from args.
Try to use the following code:
const fetchedChannel = message.guild.channels.find(r => r.name === args.join(' '));
if (command === 'delete') {
fetchedChannel.delete();
}

That code now is old if you are going to up-date(with discord.js v12) it try with:
const fetchedChannel = message.guild.channels.cache.get(channel_id);
fetchedChannel.delete();

If you want to delete a specific channel with eval command then use this code
t!eval
const fetchedChannel = message.guild.channels.cache.get("CHANNEL_ID");
fetchedChannel.delete();

use:
message.channel.delete();
you can put it in client.on like this
client.on("message", message => {
message.channel.delete()
})

How to send message in Discord.js event "guildCreate"

I have been wondering how can I send messages when someone invites my bot to their server.
Please help me in this area I can't figure it out it's there in Python but I have not used to it.
Thank you for your help

All the above answers assume you know something about the server and in most cases you do not!
What you need to do is loop through the channels in the guild and find one that you have permission to text in.
You can get the channel cache from the guild.
Take the below example:
bot.on("guildCreate", guild => {
let defaultChannel = "";
guild.channels.cache.forEach((channel) => {
if(channel.type == "text" && defaultChannel == "") {
if(channel.permissionsFor(guild.me).has("SEND_MESSAGES")) {
defaultChannel = channel;
}
}
})
//defaultChannel will be the channel object that the bot first finds permissions for
defaultChannel.send('Hello, Im a Bot!')
});
You can of course do further checks to ensure you can text before texting but this will get you on the right path
Update discord.js 12+
Discord.JS now uses cache - here is the same answer for 12+
bot.on("guildCreate", guild => {
let found = 0;
guild.channels.cache.map((channel) => {
if (found === 0) {
if (channel.type === "text") {
if (channel.permissionsFor(bot.user).has("VIEW_CHANNEL") === true) {
if (channel.permissionsFor(bot.user).has("SEND_MESSAGES") === true) {
channel.send(`Hello - I'm a Bot!`);
found = 1;
}
}
}
}
});
})

You can simply send the owner for example a message using guild.author.send("Thanks for inviting my bot");
Or you can also send a message to a specific user:
client.users.get("USER ID").send("My bot has been invited to a new server!");

I'm not sure if you're using a command handler or not since you seem new to JS I'm going to assume you're not. The following is a code snippet for what you're trying to do:
client.on('guildCreate', (guild) => {
guild.channels.find(t => t.name == 'general').send('Hey their Im here now!'); // Change where it says 'general' if you wan't to look for a different channel name.
});

How Find Emojis By Name In Discord.js

So I have been utterly frustrated these past few days because I have not been able to find a single resource online which properly documents how to find emojis when writing a discord bot in javascript. I have been referring to this guide whose documentation about emojis seems to be either wrong, or outdated:
https://anidiots.guide/coding-guides/using-emojis
What I need is simple; to just be able to reference an emoji using the .find() function and store it in a variable. Here is my current code:
const Discord = require("discord.js");
const config = require("./config.json");
const fs = require("fs");
const client = new Discord.Client();
const guild = new Discord.Guild();
const bean = client.emojis.find("name", "bean");
client.on("message", (message) => {
if (bean) {
if (!message.content.startsWith("#")){
if (message.channel.name == "bean" || message.channel.id == "478206289961418756") {
if (message.content.startsWith("<:bean:" + bean.id + ">")) {
message.react(bean.id);
}
}
}
}
else {
console.error("Error: Unable to find bean emoji");
}
});
p.s. the whole bean thing is just a test
But every time I run this code it just returns this error and dies:
(node:3084) DeprecationWarning: Collection#find: pass a function instead
Is there anything I missed? I am so stumped...

I never used discord.js so I may be completely wrong
from the warning I'd say you need to do something like
client.emojis.find(emoji => emoji.name === "bean")
Plus after looking at the Discord.js Doc it seems to be the way to go. BUT the docs never say anything about client.emojis.find("name", "bean") being wrong

I've made changes to your code.
I hope it'll help you!
const Discord = require("discord.js");
const client = new Discord.Client();
client.on('ready', () => {
console.log('ready');
});
client.on('message', message => {
var bean = message.guild.emojis.find(emoji => emoji.name == 'bean');
// By guild id
if(message.guild.id == 'your guild id') {
if(bean) {
if(message.content.startsWith("<:bean:" + bean.id + ">")) {
message.react(bean.id);
}
}
}
});

Please check out the switching to v12 discord.js guide
v12 introduces the concept of managers, you will no longer be able to directly use collection methods such as Collection#get on data structures like Client#users. You will now have to directly ask for cache on a manager before trying to use collection methods. Any method that is called directly on a manager will call the API, such as GuildMemberManager#fetch and MessageManager#delete.
In this specific situation, you need to add the cache object to your expression:
var bean = message.guild.emojis.cache?.find(emoji => emoji.name == 'bean');

In case anyone like me finds this while looking for an answer, in v12 you will have to add cache in, making it look like this:
var bean = message.guild.emojis.cache.find(emoji => emoji.name == 'bean');
rather than:
var bean = message.guild.emojis.find(emoji => emoji.name == 'bean');

Is there a command to send private message to all members of a group?

Is there any way to make a command send a private message to all members of the discord group using discord.js?
Exemple: /private TEST
This message is sent to everyone in the group in private chat instead of channel chat.

You can iterate through Guild.members.
When you receive a message that starts with /private, you take the rest and send it to every member of the guild by using Guild.members.forEach().
Here's a quick example:
client.on('message', msg => {
if (msg.guild && msg.content.startsWith('/private')) {
let text = msg.content.slice('/private'.length); // cuts off the /private part
msg.guild.members.forEach(member => {
if (member.id != client.user.id && !member.user.bot) member.send(text);
});
}
});
This is just a basic implementation, you can obviously use this concept with your command checks or modify that by adding additional text and so on.
Hope this solves the problem for you, let me know if you have any further questions :)

The updated code for discord.js v12 is just adding cache to the forEach.
client.on('message', msg => {
if (msg.guild && msg.content.startsWith('/private')) {
let text = msg.content.slice('/private'.length); // cuts off the /private part
msg.guild.members.cache.forEach(member => {
if (member.id != client.user.id && !member.user.bot) member.send(text);
});
}
});

How to Play Audio File Into Channel?

How do you play an audio file from a Discord bot? Needs to play a local file, be in JS, and upon a certain message being sent it will join the user who typed the message, and will play the file to that channel.

GitHub Project: LINK
In order to do this there are a few things you have to make sure of first.
Have FFMPEG installed & the environment path set for it in Windows [link]
Have Microsoft Visual Studio (VS) installed [link]
Have Node.js installed.[link]
Have Discord.js installed in VS.
From there the steps are quite simple. After making your project index.js you will start typing some code. Here are the steps:
Add the Discord.js dependency to the project;
var Discord = require('discord.js');
Create out client variable called bot;
var bot = new Discord.Client();
3. Create a Boolean variable to make sure that the system doesn't overload of requests;
var isReady = true;
Next make the function to intercept the correct message;
bot.on('message', message =>{ENTER CODE HERE});
Create an if statement to check if the message is correct & if the bot is ready;
if (isReady && message.content === 'MESSAGE'){ENTER CODE HERE}
Set the bot to unready so that it cannot process events until it finishes;
isReady = false;
Create a variable for the channel that the message-sender is currently in;
var voiceChannel = message.member.voice.channel;
Join that channel and keep track of all errors;
voiceChannel.join().then(connection =>{ENTER CODE HERE}).catch(err => console.log(err));
Create a refrence to and play the audio file;
const dispatcher = connection.play('./audiofile.mp3');
Slot to wait until the audio file is done playing;
dispatcher.on("end", end => {ENTER CODE HERE});
Leave channel after audio is done playing;
voiceChannel.leave();
Login to the application;
bot.login('CLIENT TOKEN HERE');
After you are all finished with this, make sure to check for any un-closed brackets or parentheses. i made this because it took my hours until I finally found a good solution so I just wanted to share it with anybody who is out there looking for something like this.

thanks so much!
One thing I will say to help anyone else, is things like where it says ENTER CODE HERE on step 10, you put the code from step 11 IE:
dispatcher.on("end", end => voiceChannel.leave());
As a complete example, this is how I have used it in my message command IF block:
if (command === "COMMAND") {
var VC = message.member.voiceChannel;
if (!VC)
return message.reply("MESSAGE IF NOT IN A VOICE CHANNEL")
VC.join()
.then(connection => {
const dispatcher = connection.playFile('c:/PAtH/TO/MP3/FILE.MP3');
dispatcher.on("end", end => {VC.leave()});
})
.catch(console.error);
};

I went ahead an included Nicholas Johnson's Github bot code here, but I made slight modifications.
He appears to be creating a lock; so I created a LockableClient that extends the Discord Client.
Never include an authorization token in the code
auth.json
{
"token" : "your-token-here"
}
lockable-client.js
const { Client } = require('discord.js')
/**
* A lockable client that can interact with the Discord API.
* #extends {Client}
*/
class LockableClient extends Client {
constructor(options) {
super(options)
this.locked = false
}
lock() {
this.setLocked(true)
}
unlock() {
this.setLocked(false)
}
setLocked(locked) {
return this.locked = locked
}
isLocked {
return this.locked
}
}
module.exports = LockableClient;
index.js
const auth = require('./auth.json')
const { LockableClient } = require('./lockable-client.js')
const bot = new LockableClient()
bot.on('message', message => {
if (!bot.isLocked() && message.content === 'Gotcha Bitch') {
bot.lock()
var voiceChannel = message.member.voiceChannel
voiceChannel.join().then(connection => {
const dispatcher = connection.playFile('./assets/audio/gab.mp3')
dispatcher.on('end', end => voiceChannel.leave());
}).catch(err => console.log(err))
bot.unlock()
}
})
bot.login(auth.token)

This is an semi old thread but I'm going to add code here that will hopefully help someone out and save them time. It took me way too long to figure this out but dispatcher.on('end') didn't work for me. I think in later versions of discord.js they changed it from end to finish
var voiceChannel = msg.member.voice.channel;
voiceChannel.join()
.then(connection => {
const dispatcher = connection.play(fileName);
dispatcher.on("finish", end => {
voiceChannel.leave();
deleteFile(fileName);
});
})
.catch(console.error);
Note that fileName is a string path for example: fileName = "/example.mp3". Hopefully that helps someone out there :)

Update: If you want to detect if the Audio has stopped, you must subscribe to the speaking event.
voiceChannel
.join()
.then((connection) => {
const dispatcher = connection.play("./audio_files/file.mp3");
dispatcher.on("speaking", (speaking) => {
if (!speaking) {
voiceChannel.leave();
}
});
})