mention voice channel discord.js code example

Example 1: discord.js join voice channel

if(!message.member.voice.channel) return message.channel.send("Please connect to a voice channel!"); //If you are not in the voice channel, then return a message
message.member.voice.channel.join(); //Join the voice channel

Example 2: how to search for a voice channel within a guild using discord.js

let channel = message.guild.channels.cache.get(channelid)