How to develop a web crawler?

Web Development Forum
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I want to extract data from websites automatically. How do I create a crawler that handles web scraping responsibly?

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Start by learning Python with BeautifulSoup or Node.js with Cheerio. Respect robots.txt rules and set reasonable request limits. Handle dynamic content with tools like Puppeteer or Selenium to scrape JavaScript-heavy pages effectively.

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Plan the crawling logic: URLs to visit, data extraction, and storage. Use proxies to avoid IP blocking and implement error handling. Always ensure compliance with legal and ethical usage policies.