Send and Receive SMS Messages via Discord with Twilio and Node.js

index.js

require('dotenv').config();
const { Client, GatewayIntentBits } = require('discord.js');
const client = new Client({ intents: [GatewayIntentBits.Guilds, GatewayIntentBits.GuildPresences, GatewayIntentBits.GuildMessages, GatewayIntentBits.MessageContent, , GatewayIntentBits.GuildMembers] });
const twilio = require('twilio')(process.env.TWILIO_ACCOUNT_SID, process.env.TWILIO_AUTH_TOKEN);
const friendsChannelId = 'XXXXXX';
const myUserId = 'XXXXXX';
 
const express = require('express')
const app = express();
app.use(express.urlencoded({
   extended: true
  }));

function sendSMS(sms) {
   twilio.messages.create({
       body: sms,
       to: process.env.PERSONAL_NUMBER,
       from: process.env.TWILIO_NUMBER,
   });
}

client.on("messageCreate", function(message) {
    if (message.author.bot) return;
    if (message.channel.id == friendsChannelId && message.author.id != myUserId) {
        const sms = `${message.author.username}: ${message.content}`;
        sendSMS(sms);
    }
    else if(message.mentions.members.has(myUserId)) {
        const sms = `${message.author.username} mentioned you in ${message.channel.name}: ${message.content}`
        sendSMS(sms);
    } 
 });

client.on("guildMemberAdd", function(member) {
    sendSMS(`${member.user.username} has joined the server!`)
}); 

client.on("guildMemberRemove", function(member) {
    sendSMS(`${member.user.username} has left the server!`)
}); 

app.post('/sms', async (req, res) => {
    if(req.body.From != process.env.PERSONAL_NUMBER) return;
    const channel = client.channels.cache.get(friendsChannelId);
    channel.send(req.body.Body)
});

app.listen(3000, () => {
    console.log(`Listening on port 3000`);
});

client.login(process.env.BOT_TOKEN);