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I'm building a simple webapp to teach myself node.js, and in it I need to check whether a certain domain name specified by the user is registered. I'm not really sure how to go about this and I'd appreciate it if anybody could enlighten me.
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To do a domain availability/registered check (not a DNS check), either use the whois protocol, or specific registry service for checking domain availability (depends on the TLD) or use one registrar API that has the TLDs you need, since the registrars, through EPP typically, can do realtime availability checks at the ...
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Take a look at this article by Matt Brubeck:
http://limpet.net/mbrubeck/2010/01/13/si-unit-domains-node-js.html
There is a Node.js script that does exactly that.
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I think the best way to do this is to use the dns module to do a resolve, and if nothing is returned or an error is thrown it's not registered yet.
https://nodejs.org/api/dns.html
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