Random image generator not working for discord bot (javascript)

I've fiddled around with it and still can not get it to work. Also I have tried with a singular image and it worked without problem. Here's my code:

exports.run = (client, message, args) => {
    var rands = ["./catboy/cb1.jpg","./catboy/cb2.jpg","./catboy/cb3.jpg","./catboy/cb4.jpg"];
    var rand = [Math.floor(Math.random()*(rands.length))];
    message.channel.send("rawr", rand);
}

Thanks.