JavaScript TypeError: Cannot read property 'startsWith' of undefined - discord bot

Question

I must start this question by saying that I have very little knowledge of javascript (I\'m practiced in Java) and just wanted to make a (somewhat) simple Discord bot that would

Answer 1

Your issue is, that you mix discord.js with discord.io

discord.js is object oriented where discord.io is not, so in discord.io your message is already a string!

Example discord.io message event.

bot.on('message', function(user, userID, channelID, message, event) {
    if (message === "ping") {
        bot.sendMessage({
            to: channelID,
            message: "pong"
        });
    }
});

Answer 2

Maybe jam something like if(!msg || !msg.content) return; in there to bail out if the msg object or its content property is undefined.

bot.on('message', (msg) => {

  if(!msg || !msg.content) return;

  if (msg.content.startsWith(prefix + "on")) {
        if (randOn) {
            msg.channel.sendMessage("Already running.");
        }
        else {
            msg.channel.sendMessage("Random message started.")
        randomMessage = setTimeout(function() {
                randMsg(msg.channel);
            }, 1000*timer[0]);
        }
  }
  else if (msg.content.startsWith(prefix + "off")) {
        if (randOn) {
            clearTimeout(randomMessage);
            msg.channel.sendMessage("Random message disabled.");
        }
        else {
            msg.channel.sendMessage("Not running.");
        }
  }


});