Web Automation

Web Automation

Comprehensive web automation covering browser automation, web scraping, and workflow automation tools.

Quick Decision Guide

Need browser automation?
+-- Modern testing/scraping --> Playwright (recommended)
+-- Chrome-only, PDF/screenshots --> Puppeteer
+-- Legacy/cross-browser --> Selenium
+-- Serverless/API-based --> Browserless

Need data scraping?
+-- Large-scale crawling --> Scrapy
+-- Dynamic content (JS) --> Playwright
+-- Simple HTML --> BeautifulSoup

Need workflow automation?
+-- Visual workflows --> n8n

Playwright (Recommended)

Installation

npm init playwright@latest
# or
pip install playwright
playwright install

Basic Example

import { chromium } from "playwright";

async function scrape() {
  const browser = await chromium.launch();
  const page = await browser.newPage();

  await page.goto("https://example.com");
  await page.waitForSelector(".content");

  const title = await page.textContent("h1");
  const links = await page.$$eval("a", (els) =>
    els.map((el) => ({ text: el.textContent, href: el.href }))
  );

  await browser.close();
  return { title, links };
}

Common Patterns

// Screenshot
await page.screenshot({ path: "screenshot.png", fullPage: true });

// PDF generation
await page.pdf({ path: "page.pdf", format: "A4" });

// Fill forms
await page.fill('input[name="email"]', "user@example.com");
await page.click('button[type="submit"]');

// Wait for navigation
await Promise.all([page.waitForNavigation(), page.click("a.next-page")]);

// Handle dialogs
page.on("dialog", (dialog) => dialog.accept());

Puppeteer

Installation

npm install puppeteer

Basic Example

const puppeteer = require("puppeteer");

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

  await page.goto("https://example.com");
  await page.screenshot({ path: "example.png" });

  await browser.close();
})();

Scrapy (Python)

Installation

pip install scrapy
scrapy startproject myproject

Spider Example

import scrapy

class QuotesSpider(scrapy.Spider):
    name = 'quotes'
    start_urls = ['https://quotes.toscrape.com']

    def parse(self, response):
        for quote in response.css('div.quote'):
            yield {
                'text': quote.css('span.text::text').get(),
                'author': quote.css('small.author::text').get(),
                'tags': quote.css('div.tags a.tag::text').getall(),
            }

        # Follow pagination
        next_page = response.css('li.next a::attr(href)').get()
        if next_page:
            yield response.follow(next_page, self.parse)

Best Practices

Rate Limiting

// Add delays between requests
await page.waitForTimeout(1000 + Math.random() * 2000);

User Agent Rotation

const userAgents = [
  "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36...",
  "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36...",
];

await page.setUserAgent(
  userAgents[Math.floor(Math.random() * userAgents.length)]
);

Error Handling

try {
  await page.goto(url, { timeout: 30000 });
} catch (error) {
  if (error.name === "TimeoutError") {
    console.log("Page load timeout, retrying...");
    await page.goto(url, { timeout: 60000 });
  }
}

Respectful Scraping

1. Check robots.txt before scraping
2. Add reasonable delays between requests
3. Identify your bot with a custom User-Agent
4. Cache responses to avoid repeated requests
5. Respect rate limits and Terms of Service

When to Use This Skill

• Automating browser interactions for testing
• Scraping data from websites
• Generating PDFs or screenshots
• Building web crawlers
• Creating workflow automations
• Monitoring website changes

Tool Comparison

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