I have been trying to run an app where I can set up an email.
When I run it on the localhost, I get a 202 response, but I don’t get an email. I conclude that this is because it is the localhost and conclude I should upload it on cloudflare and set up a domain. I do this, however, when I look at the deployment details, I get this error.

TypeError [ERR_INVALID_ARG_TYPE]: The “path” argument must be of type string. Received undefined

I have the code here.

import url from "node:url";
import path from "path";
import { fileURLToPath } from "url";
//Not sure why the value is never read. 
import express from "express";
import bodyParser from "body-parser";
import sgMail from '@sendgrid/mail';
import process from 'node:process';
import dotenv from 'dotenv';
dotenv.config();

const __filename = url.fileURLToPath(import.meta.url);
const __dirname = import.meta.filename;

//const PORT = 3000; // Defining PORT
//This was for the localhost. 

const apikey = process.env.API_KEY;


const app = express();
app.use(express.static(path.join(__dirname)));
app.use(bodyParser.urlencoded({ extended: true }));

app.get("/", (req, res) => {
  res.sendFile(path.join(__dirname, import.meta.url));
  res.sendFile(path.join(__dirname, "index.html"));
  res.sendFile(path.join(__dirname, "sendgridpart2.css"));
  res.end();
});

app.post("/submit", (req, res) => {
console.log(`${apikey} is the apikey`)
  sgMail.setApiKey(apikey)


  const msg = {
    to: req.body.To,
    from: req.body.From, 
    subject: req.body.Subject,
    text: req.body.Message,
    html: req.body.Message,
  };
  sgMail
    .send(msg)
     .then((response) => {
      console.log(response[0].statusCode);
      console.log(response[0].headers);
    })
    .catch((error) => {
      console.error(error);
    });
});





{ 
  "name": "sendgridpart2",
  "version": "1.0.0",
  "description": "",
  "main": "app.js",
  "type": "module",
  "scripts": {
    "test": "echo "Error: no test specified" && exit 1"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "dependencies": {
    "@sendgrid/mail": "^8.1.3",
    "body-parser": "^1.20.2",
    "dotenv": "^16.4.5",
    "express": "^4.19.2",
    "node": "^22.4.0",
    "nodemon": "^3.1.4"
  }
}

I have attempted to find a way to fix the code. One error, I noticed earlier was that I still had the localhost functioning. I commented it out. Additionally, I saw an error that I had
const __dirname = import.meta.firname; . I assumed this was causing the issue with making the path a string, but that didn’t change anything. Thank you for the help.