local-ipv4-address

Get the local network IPv4 address of the current computer based on the default gateway.

All of the other Node.js modules I found picked the address of the first or a random external interface from os.networkInterfaces() or performed a DNS lookup on the hostname. What if I have VMware virtual interfaces, an OpenVPN connection, wifi, an ethernet cable, and some loopback interfaces with convincing-looking hosts entries all connected?

Under the hood, it just executes route.exe or netstat and parses the output with regular expressions.

Installation

$ npm install --save local-ipv4-address

Usage

In a Node module

var localIpV4Address = require("local-ipv4-address");

localIpV4Address().then(function(ipAddress){
    console.log("My IP address is " + ipAddress);
    // My IP address is 10.4.4.137
});

On the command line

$ node node_modules/local-ipv4-address
10.4.4.137

Platform support

Operating System	Versions tested
FreeBSD	11.0
Linux	Debian 8.7 Jessie
Mac OS	10.12.4 Sierra
Windows	7, Server 2016

What's not handled

• WAN address
• IPv6
• Multiple gateways
• Multi-homed connections