Get hostname of current request in node js Express

Question

So  I may be missing something simple here  but I can t seem to find a way to get the hostname that a request object I m sending a response to was requested from   Is it possible to figure out what hostname the user is currently visiting from node js

User · Accepted Answer

If you re talking about an HTTP request  you can find the request host in   request headers host   But that relies on an incoming request   More at http   nodejs org docs v0 4 12 api http html http ServerRequest  If you re looking for machine native information  try the process object

User · Answer

You can use the os Module   var os   require  os    os hostname      See http   nodejs org docs latest api os html os os hostname  Caveats    if you can work with the IP address -- Machines may have several Network Cards and unless you specify it node will listen on all of them  so you don t know on which NIC the request came in  before it comes in   Hostname is a DNS matter --  Don t forget that several DNS aliases can point to the same machine

User · Answer

First of all  before providing an answer I would like to be upfront about the fact that by trusting headers you are opening the door to security vulnerabilities such as phishing  So for redirection purposes  don t use values from headers without first validating the URL is authorized   Then  your operating system hostname might not necessarily match the DNS one  In fact  one IP might have more than one DNS name  So for HTTP purposes there is no guarantee that the hostname assigned to your machine in your operating system configuration is useable   The best choice I can think of is to obtain your HTTP listener public IP and resolve its name via DNS  See the dns reverse method for more info  But then  again  note that an IP might have multiple names associated with it

User · Answer

If you need a fully qualified domain name and have no HTTP request  on Linux  you could use   var child process   require  child process     child process exec  hostname -f   function err  stdout  stderr      var hostname   stdout trim

User · Answer

Here s an alternate  req hostname   Read about it in the Express Docs

[node.js] Get hostname of current request in node.js Express

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