Build a Discord bot that Tweets

Question

I've been tasked with creating a bot which can create a tweet when someone posts in a Discord server. I've not been able to find any documentation out there aside from Twitter -> Discord bots. But it's clearly doable, as the site https://www.Zapier.com seems to offer exactly that.

I've been using discord.js and node.js for my projects so far.

Answer 1

I figured it out.

// Discord Modules
const Discord = require('discord.js')
const fs = require('fs');
const { prefix, token } = require('./config.js')

// Express for the Heroku fix
const express = require('express');
const app = express();

// Hook up to the server as a user
const client = new Discord.Client()
client.commands = new Discord.Collection()

// Create a collection of available commands
const commandFiles = fs.readdirSync('./commands').filter(file => file.endsWith('.js'));

for (const file of commandFiles) {
    const command = require(`./commands/${file}`);

    // set a new item in the Collection
    // with the key as the command name and the value as the exported module
    client.commands.set(command.name, command);
}


// Listen for incoming chat commands, and compare them to the collection.
client.on('message', async message => {
  if (!message.content.startsWith(prefix) || message.author.bot) return;

  const args = message.content.slice(prefix.length).split(/ +/);
  const commandName = args.shift().toLowerCase();
  const command = client.commands.get(commandName);

  if (!client.commands.has(commandName)) return;
  
  if (command.args && !args.length) {
    return message.channel.reply(`You didn't provide any arguments`)
  }

  try {
    command.execute(message, args)
  } catch (error) {
    console.error(error);
    message.reply('there was an error trying to execute that command!');
  }
})


  //For avoidong Heroku $PORT error
app.set('port', (process.env.PORT || 5000));

app.get('/', function(request, response) {
    var result = 'App is running'
    response.send(result);
}).listen(app.get('port'), function() {
    console.log('App is running, server is listening on port ', app.get('port'));
});

client.login(token)

And the command to call in order to post a tweet

// Twitter Modules
const Twit = require('twit');
const config = require('../config');
const T = new Twit(config);

module.exports = {
  name: 'tweet',
  description: 'create a tweet from a discord post',
  execute(message, args) {
    let discPost = args
    T.post('statuses/update', { status: discPost }, tweeted)
  }
}

// Make sure it worked!
function tweeted (err, reply) {
  if (err !== undefined) {
    console.log(err)
  } else {
    console.log('Tweeted: ' + reply)
  }
}

Ugly little proof of concept, but it works.