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os.networkInterfaces()

Returns an object describing the network interfaces assigned to the host.

Since Node 0.6 Spec ↗

Syntax

os.networkInterfaces()

Returns

object — Interface names mapped to arrays of address objects.

Examples

import { networkInterfaces } from 'node:os';

const nets = networkInterfaces();
console.log(Object.keys(nets));
Output 
[ 'lo0', 'en0' ]

import { networkInterfaces } from 'node:os';

for (const addrs of Object.values(networkInterfaces())) {
  for (const a of addrs) {
    if (a.family === 'IPv4' && !a.internal) console.log(a.address);
  }
}
Output 
192.168.1.42

Notes

Filter out `internal` (loopback) entries and check `family` for `'IPv4'`/`'IPv6'` to find the LAN address. The list reflects the state at call time and can change.

See also