A simple NodeJS Puppeteer automation script to detect a single change on a webpage. Supports authentication.

index.js

/**
 * 1. npm init -y
 * 2. npm install puppeteer @types/puppeteer env-cmd say
 * 3. create .env file with required variables
  id_selector=
	password_selector=
	submit_selector=
	id=
	password=
	login=
	target=
	message=
	query=
 * 4. npx env-cmd node index.js
 * voila!
 */

const puppeteer = require('puppeteer')
const say = require('say')

const {
	id,
	password,
	login,
	target,
	message,
	query,
	id_selector,
	password_selector,
	submit_selector
} = process.env

const speak = async (message, voice, speed) => {
	return new Promise((resolve, reject) => {
		say.speak(message, voice, speed, err => {
			if (err) reject(err)
			else resolve()
		})
	})
}

const selectors = {
	id: id_selector,
	password: password_selector,
	submit: submit_selector
}

/**
 *
 * @param {puppeteer.Page} page
 */
const doLogin = async page => {
	console.log('navigating to login page')
	await page.goto(login)

	console.log('filling in login details')
	await (await page.$(selectors.id)).type(id, { delay: 100 })
	await (await page.$(selectors.password)).type(password, { delay: 100 })
	await (await page.$(selectors.submit)).click()

	console.log('waiting for login redirection')
	return page.waitForNavigation()
}

/**
 *
 * @param {puppeteer.Page} page
 */
const reloadAndCheck = async page => {
	try {
		console.log('navigating to target')
		await page.goto(target)

		console.log('checking current page url', page.url())
		if (page.url() !== target || (await page.$(selectors.id))) {
			console.log('not logged in?')
			await doLogin(page)

			console.log('navigating to target again')
			await page.goto(target)
		}

		console.log('Waiting 10 seconds before checking')
		setTimeout(async () => {
			if (
				!(await page.evaluate(() => document.body.innerHTML)).includes(query)
			) {
				console.log('page has different content than query')
				console.log(await speak(message, undefined, undefined))
				console.log(await speak(message, undefined, undefined))
				console.log(await speak(message, undefined, undefined))
				console.log(await speak(message, undefined, undefined))
			} else console.log('page has query')
		}, 10000)
	} catch (error) {
		console.error(error)
		speak('Something went wrong')
		speak('Something went wrong')
	}
}

;(async () => {
	try {
		const browser = await puppeteer.launch({
			headless: true
		})
		const page = await browser.newPage()

		await page.goto(target)

		reloadAndCheck(page)
		setInterval(() => reloadAndCheck(page), 1000 * 60 /* 60 seconds */)
	} catch (error) {
		console.log(error)
		await browser.close()
	}
})()