How to get host IP address and port number on which application is running using javascript

Question

can anyone tell me how to get the host ip address and port number on which the web application is running using javascript (e.g. 127.0.0.1:8080)

Answer 1

I am afraid that it is not possible to directly obtain an IP address through Javascript. It does not appear in the window.location object.

Part of the reason is that subsequently access to address:port not semantically the same as access to hostname:port - they are technically different URLs.

If what you really are after is part of the host of the URL from which the current web file was downloaded, you need to:

 window.location.hostname window.location.port 

The latter may be empty if the default port is used, so you should also read:

 window.location.protocol 

and check if it has http: (i.e. port 80) or https: (port 443).

You can also use:

 window.location.host 

which will contain both hostname and port as colon-separated strings, with the same caution as above, that the :port section will be omitted if the content is accessed through the default port for the protocol.

Answer 2

 document.location.host // localhost:1234 document.location.hostname // localhost document.location.port // 1234