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An ever-increasing number of websites use JavaScript to fetch and render user content. Until now, there was no such library for JavaScript, THE language of the web. The Apify SDK is an open-source library that simplifies the development of web crawlers, scrapers, data extractors and web automation jobs. It provides tools to manage and automatically scale a pool of headless Chrome / Puppeteer instances, to maintain queues of URLs to crawl, store crawling results to a local filesystem or in the cloud, rotate proxies and much more.