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JavaScript challenges act like stealthy ninjas, ready to block your web scraping attempts without you even realizing it. These hidden scripts verify if a user is human, and they're used by services like Cloudflare. To bypass these challenges, you need automation tools like Selenium, Puppeteer, or Playwright that can simulate human interactions in browsers. However, advanced challenges may still pose obstacles. The ideal solution is Bright Data’s Scraping Browser, which combines efficiency with cloud scaling, rotating IPs, and seamless integration with popular browser automation libraries.