is it possible to write web crawler in javascript?

Question

I want to crawl the page and check for the hyperlinks in that respective page and also follow those hyperlinks and capture data from the page

Answer 1

My typical setup is to use a browser extension with cross origin privileges set, which is injecting both the crawler code and jQuery.

Another take on Javascript crawlers is to use a headless browser like phantomJS or casperJS (which boosts phantom's powers)