How to join a voice channel when command is typed in discord.js?

@orpha 

To join a voice channel in Discord using discord.js, you can use the message.member.voice.channel property to get the voice channel the user is currently in and the voiceChannel.join() method to join the voice channel. Here's an example code snippet that shows how to join a voice channel when a specific command is typed:

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const Discord = require('discord.js');
const client = new Discord.Client();
const prefix = '!';

client.on('message', async message => {
  if (!message.content.startsWith(prefix) || message.author.bot) return;

  const args = message.content.slice(prefix.length).trim().split(/ +/);
  const command = args.shift().toLowerCase();

  if (command === 'joinvc') {
    if (message.member.voice.channel) {
      const connection = await message.member.voice.channel.join();
      message.channel.send('Joined voice channel!');
    } else {
      message.channel.send('You need to be in a voice channel to use this command.');
    }
  }
});

client.login('your-bot-token');

In this code snippet, the bot listens for messages and checks if the message starts with the specified prefix and is not sent by another bot. If the command is !joinvc, it then checks if the user who sent the message is in a voice channel. If they are in a voice channel, the bot joins that voice channel using the voiceChannel.join() method, and sends a message confirming that it has joined the voice channel. If the user is not in a voice channel, the bot sends a message indicating that the user needs to be in a voice channel to use the command.

Make sure to replace 'your-bot-token' with your actual bot token. Also, don't forget to add appropriate error handling and permissions checks to your code for a more robust and secure solution.