price.md

Send an Email When Price Drops Below a Certain Amount

// run `npm install dotenv`, then place a .env file in the same directory as this script
require('dotenv').config(); 
const { window } = require('page-evaluate');
const { send } = require('emailjs-gmail')(process.env.GMAIL_USERNAME, process.env.GMAIL_PASSWORD);
const getNumbersOnly = (str) => (str.match(/[0-9\.]+/g) || []).join('');

const DESIRED_PRICE = 50; 

window('https://example.com').then(({ document }) => {
  // grab the value of the price element on the page
  const priceText = document.querySelector('#ProductPrice').textContent.trim();               
  const price = getNumbersOnly(priceText); 
  
  // check if the price is low enough
  if (Number(price) <= DESIRED_PRICE) {
    // send an email
    send('5555555555@txt.att.net',
      `Your wildest dream is only $${price} now!`);
  }
});