Uploading Node.js

I am building an email address registration application using Node.js on Udemy, with mailchimp.
The instructor used heroku in Udemy, but now I am trying to host it using Render.com because heroku isn’t free.So I found a YouTube video. How to Deploy a Node.js App to Render.com for Free (Heroku Alternative) - YouTube
It was going well until about 5:50 in this video.
Here’s the code I typed in Hyper following the video.

rm -rf node_modules / package-lock.json 
git init 
git branch -M main 
git add . 
git commit -m "First Commit" 
git remote add origin https://github.com/yoriss67/Newsletter-Signup.git git push -u origin main 
node app.js

and below is app.js

const express = require('express');
const mailchimp = require("@mailchimp/mailchimp_marketing");
const https = require('node:https');
const { url } = require('node:inspector');
const app = express();


app.use(express.static('public'))

// old 「body-parser」
app.use(express.urlencoded({
  extended: true
}));


app.get('/', function (req, res) {
  res.sendFile(__dirname + '/signup.html')
})

// -------------
mailchimp.setConfig({
  apiKey: "eeb85b047aa8497f6038c75a82978ab2-us◯◯",
  server: "us◯◯"
});
// --------------


app.post('/', function (req, res) {
  const firstName = req.body.fName;
  const lastName = req.body.lName;
  const email = req.body.email;

  console.log(firstName, lastName, email)


  //*****************************ENTER YOU LIST ID HERE******************************
  const listId = "◯◯";
  //Creating an object with the users data
const subscribingUser = {
  firstName: firstName,
  lastName: lastName,
  email: email
 };


  // *** Construct Requesting data ***
  // members's key-value pair
  const data = {
    members: [{
      email_address: email,
      status: 'subscribed',
      merge_fields: {
        FNAME: firstName,
        LNAME: lastName
      }
    }]
  }

  // 👩‍🎓Now we have our data object completed, but this is JavaScript and what we need is actually to turn this into a flatpack JSON.
const jsonData = JSON.stringify(data);

// 👩‍🎓make our request
//  const url = "https://us{list server number}.api.mailchimp.com/3.0/lists/{List ID}"
const url = "https://us◯◯.api.mailchimp.com/3.0/lists/◯◯"


const options = {
  method: 'POST',
  // how we use API key for auth? > A. HTTP Basic Authentication (a pair of ①string as username ②API key)
  auth: 'yoriss67:eeb85b047aa8497f6038c75a82978ab2-us◯◯'
}

// 🤔constにしないとその場で終わっちゃってdataをserverに持っていって活用できなくなるから?
const request = https.request(url, options, function(response) {

if(response.statusCode === 200) {
  // res.send('Successfully subscribed!!!!!!')
    res.sendFile(__dirname + '/success.html')

} else {
  // res.send('There was an error')
  res.sendFile(__dirname + '/failure.html')


}

  response.on('data', function(data) {
    console.log(JSON.parse(data))
  })
})

request.write(jsonData);
request.end();

})

// 250
app.post('/again', function(req, res) {
  console.log('Again')
  res.sendFile(__dirname + '/signup.html')

})

app.listen(2480, function () {
  console.log('server is running on port 2480')
});

package.json

{
  "name": "newsletter-signup",
  "version": "1.0.0",
  "description": "Newsletter-Signup project!",
  "main": "app.js",
  "scripts": {
    "start": "node app.js",
    "test": "echo \"Error: no test specified\" && exit 1",
    "build": "nodemon app.js"
  },
  "author": "yoriss67",
  "license": "ISC",
  "dependencies": {
    "@mailchimp/mailchimp_marketing": "^3.0.80",
    "async": "^3.2.4",
    "express": "^4.18.2",
    "https": "^1.0.0",
    "request": "^2.88.2",
    "yarn": "^1.22.19"
  }
}

Of course I try to do my best but I hope someone tells me how to figure out this problem.