How do I get the domain originating the request in express js

Question

I m using express js and i need to know the domain which is originating the call  This is the simple code  app get        verify license key json       function  req  res                do something   How do i get the domain from the req or the res object  I mean i need to know if the api was called by somesite com or someothersite com   I tried doing a console dir of both req and res but i got no idea from there  also read the documentation but it gave me no help

User · Answer

In Express 4 x you can use req hostname  which returns the domain name  without port  i e       Host   example com 3000  req hostname      gt   example com    See  http   expressjs com en 4x api html req hostname

User · Answer

Instead of   var host   req get  host    var origin   req get  origin      you can also use   var host   req headers host  var origin   req headers origin

User · Answer

You have to retrieve it from the HOST header   var host   req get  host      It is optional with HTTP 1 0  but required by 1 1  And  the app can always impose a requirement of its own     If this is for supporting cross-origin requests  you would instead use the Origin header   var origin   req get  origin      Note that some cross-origin requests require validation through a  preflight  request   req options   route   function  req  res        var origin   req get  origin                       If you re looking for the client s IP  you can retrieve that with   var userIP   req socket remoteAddress     message socket  socket remoteAddress   Note that  if your server is behind a proxy  this will likely give you the proxy s IP  Whether you can get the user s IP depends on what info the proxy passes along  But  it ll typically be in the headers as well

User · Answer

Recently faced a problem with fetching  Origin  request header  then I found this question  But pretty confused with the results  req get  host   is deprecated  that s why giving Undefined  Use        req header  Origin        req header  Host           this method can be used to access other request headers like   Referer    User-Agent  etc

[javascript] How do I get the domain originating the request in express.js?

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