Get the client s IP address in socket io

Question

When using socket IO in a Node js server  is there an easy way to get the IP address of an incoming connection  I know you can get it from a standard HTTP connection  but socket io is a bit of a different beast

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Using the latest 1 0 6 version of Socket IO and have my app deployed on Heroku  I get the client IP and port using the headers into the socket handshake   var socketio   require  socket io   listen server    socketio on  connection   function socket       var sHeaders   socket handshake headers    console info    s  s  CONNECT   sHeaders  x-forwarded-for    sHeaders  x-forwarded-port

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for 1 0 4   io sockets on  connection   function  socket      var socketId   socket id    var clientIp   socket request connection remoteAddress     console log clientIp

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Okay  as of 0 7 7 this is available  but not in the manner that lubar describes  I ended up needing to parse through some commit logs on git hub to figure this one out  but the following code does actually work for me now   var io   require  socket io   listen server    io sockets on  connection   function  socket      var address   socket handshake address    console log  New connection from     address address         address port

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on socket io 1 3 4 you have the following possibilities   socket handshake address   socket conn remoteAddress or  socket request client  peername address

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Very easy  First put   io sockets on  connection   function  socket     console log socket     You will see all fields of socket  then use CTRL F and search the word address  Finally  when you find the field remoteAddress use dots to filter data  in my case it is  console log socket conn remoteAddress

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Here s how to get your client s ip address  v 3 1 0       Current Client const ip   socket handshake headers  quot x-forwarded-for quot   split  quot   quot   1  toString   substring 1  this length      Server  const ip2   socket handshake headers  quot x-forwarded-for quot   split  quot   quot   0  toString      And just to check if it works go to geoplugin net json gsp ip  just make sure to switch the ip in the link  After you have done that it should give you the accurate location of the client which means that it worked

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I have found that within the socket handshake headers there is a forwarded for address which doesn t appear on my local machine  And I was able to get the remote address using   socket handshake headers  x-forwarded-for     This is in the server side and not client side

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For latest socket io version use  socket request connection remoteAddress   For example   var socket   io listen server   socket on  connection   function  client      var client ip address   socket request connection remoteAddress      beware that the code below returns the Server s IP  not the Client s IP  var address   socket handshake address  console log  New connection from     address address         address port

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In version v2 3 0  this work for me    socket handshake headers  x-forwarded-for   split      0

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This works for the 2 3 0 version  io on  connection   socket   gt       const ip   socket handshake headers  x-forwarded-for      socket conn remoteAddress split  quot   quot   3      console log ip

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From reading the socket io source code it looks like the  listen  method takes arguments  server  options  fn  and if  server  is an instance of an HTTP S server it will simply wrap it for you   So you could presumably give it an empty server which listens for the  connection  event and handles the socket remoteAddress  however  things might be very difficult if you need to associate that address with an actual socket io Socket object   var http   require  http       io   require  socket io    io listen new http Server   on  connection   function sock      console log  Client connected from      sock remoteAddress      listen 80      Might be easier to submit a patch to socket io wherein their own Socket object is extended with the remoteAddress property assigned at connection time

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This seems to work   var io   require  socket io   listen 80   io sockets on  connection   function  socket      var endpoint   socket manager handshaken socket id  address    console log  Client connected from      endpoint address         endpoint port

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If you use an other server as reverse proxy all of the mentioned fields will contain localhost  The easiest workaround is to add headers for ip port in the proxy server   Example for nginx   add this after your proxy pass   proxy set header  X-Real-IP  remote addr  proxy set header  X-Real-Port  remote port    This will make the headers available in the socket io node server   var ip   socket handshake headers  x-real-ip    var port   socket handshake headers  x-real-port      Note that the header is internally converted to lower case   If you are connecting the node server directly to the client   var ip   socket conn remoteAddress    works with socket io version 1 4 6 for me

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In 1 3 5    var clientIP   socket handshake headers host

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Since socket io 1 1 0  I use    io on  connection   function  socket      console log  connection     socket request connection  peername        connection     address   192 168 1 86   family   IPv4   port  52837       Edit   Note that this is not part of the official API  and therefore not guaranteed to work in future releases of socket io   Also see this relevant link   engine io issue

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In socket io 2 0  you can use   socket conn transport socket  socket remoteAddress  works with transports    websocket

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use socket request connection remoteAddress

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Welcome in 2019  where typescript slowly takes over the world  Other answers are still perfectly valid   However  I just wanted to show you how you can set this up in a typed environment   In case you haven t yet  You should first install some dependencies   i e  from the commandline  npm install  lt dependency-goes-here gt  --save-dev      devDependencies                   types express     4 17 2                 types socket io     2 1 4         types socket io-client     1 4 32                ts-node     8 4 1        typescript     3 6 4        I defined the imports using ES6 imports  which you should enable in your tsconfig json file first    import   as SocketIO from  socket io   import   as http from  http   import   as https from  https   import   as express from  express     Because I use typescript I have full typing now  on everything I do with these objects   So  obviously  first you need a http server   const handler   express     const httpServer    useHttps      https createServer serverOptions  handler      http createServer handler     I guess you already did all that  And you probably already added socket io to it   const io   SocketIO httpServer   httpServer listen port       gt  console log  listening      io on  connection    socket    gt  onSocketIoConnection socket      Next  for the handling of new socket-io connections  you can put the SocketIO Socket type on its parameter   function onSocketIoConnection socket  SocketIO Socket               I usually create a custom kind of session object here       then I pass this session object to the onMessage and onDisconnect methods     socket on  message    msg    gt  onMessage          socket once  disconnect    reason    gt  onDisconnect            And then finally  because we have full typing now  we can easily retrieve the ip from our socket  without guessing   const ip   socket conn remoteAddress  console log  client ip    ip

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Version 0 7 7 of Socket IO now claims to return the client s IP address   I ve had success with   var socket   io listen server   socket on  connection   function  client      var ip address   client connection remoteAddress

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Latest version works with   console log socket handshake address

[node.js] Get the client's IP address in socket.io

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