welcome message js errpr - discord

Question

from this code im getting the error /home/container/welcome.js:9
message.channel.send(message)
^
TypeError: Cannot read property 'send' of undefined
const channelId = "812458294085550121";
bot.on("guildMemberAdd", (member) => {
console.log(member);
const message = [`Welcome <#${member.id}> to our server`]
const channel = member.guild.channels.cache.get(channelId)
message.channel.send(message)
})
}```

Answer 1

the problem you seem to have is, that channel can not be found. Hence the can not find property 'send' of undefined.
Try this:
const channelId = "812458294085550121";
bot.on("guildMemberAdd", (member) => {
console.log(member);
const welcomeMessage = `Welcome <#${member.id}> to our server`;
const channel = client.channels.cache.get(channelId);
channel.send(welcomeMessage);
});
}

Answer 2

You defined 'message' in your code to receive the channel while you have 'message' defined as a message to send and not as an object. Also you made your message in an array what is a bit confusing, so what you also would need to do is access the message in the array with an index position. This should work:
const channelId = "812458294085550121"; // Define the channel id
bot.on("guildMemberAdd", (member) => { // Event listener when someone joined a server
console.log(member); // Sends the member object in the console
const message = [`Welcome <#${member.id}> to our server`] // Message in an array
const channel = member.guild.channels.cache.get(channelId) // Find the channel
if(!channel) return console.log(`Channel doesn't exists`); // If the channel doesn't exists
channel.send(message[0]); // Send the message in the channel
});