How to fix npm ERR! code EADDRNOTAVAIL npm ERR! errno EADDRNOTAVAIL npm ERR! Address not available in npm

First, verify if a HOST environment variable is configured that might be causing the issue.

On Linux/macOS:

echo $HOST
echo $HOSTNAME

On Windows (PowerShell):

$env:HOST
$env:HOSTNAME

If you find a problematic HOST variable, unset it:

On Linux/macOS:

unset HOST

On Windows (PowerShell):

Remove-Item env:HOST

Check what IP addresses are actually assigned to your machine:

On Linux/macOS:

ifconfig
# or
ip addr show

On Windows:

ipconfig

Make sure any IP address you're trying to bind to actually appears in this list. If it doesn't, that's why you're getting EADDRNOTAVAIL.

If you have custom npm registry or network settings, reset them to defaults:

npm config list

npm config delete registry
npm config delete https-proxy
npm config delete proxy
npm config delete http-proxy

npm config set registry https://registry.npmjs.org/

Alternatively, remove or rename your .npmrc file:

mv ~/.npmrc ~/.npmrc.backup
npm install

If you're behind a corporate proxy, configure npm to use it properly:

npm config set proxy http://proxy.example.com:8080
npm config set https-proxy http://proxy.example.com:8080

You can also set environment variables:

export HTTP_PROXY=http://proxy.example.com:8080
export HTTPS_PROXY=http://proxy.example.com:8080
npm install

For applications (not npm install), if binding to a specific IP is required, use 0.0.0.0 to listen on all available interfaces instead:

// Instead of:
app.listen(3000, '192.168.1.100')

// Use:
app.listen(3000, '0.0.0.0')

// Or for localhost only:
app.listen(3000, '127.0.0.1')

If running in a container, always use 0.0.0.0 since the container doesn't have access to your host machine's private IP addresses.