Need a Javascript function for automatically scraping data from a website

I need a javascript function to automatically login and then scrape some detail from a website. I have the login details saved on a server side database. I need to use these login details and login to a website and then scrape some basic information from there. I heard that we can do this by dynamic iframing of the urls... and get things done... but I need to know the exact details on how to get this done.
Are you limited to Javascript? This is possible (and relatively easy with languages that support cURL (PHP, Python, etc.) but I'm not sure even possible with JS.

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