The EAI_AGAIN error is a DNS lookup failure that occurs when npm cannot resolve the registry hostname. This is typically a temporary DNS issue that can be resolved by checking your network connection or DNS configuration.
EAI_AGAIN is a DNS resolution error code meaning "temporary failure in name resolution." When npm tries to connect to registry.npmjs.org, it first needs to resolve this hostname to an IP address through DNS. If the DNS server is unavailable or overloaded, it returns this temporary error. Unlike permanent DNS failures (EAI_NONAME), EAI_AGAIN suggests the issue is transient and retrying may succeed.
Check if DNS is working for the npm registry:
nslookup registry.npmjs.org
# or
dig registry.npmjs.orgIf these fail, DNS is the problem.
Use Google or Cloudflare DNS instead of your ISP's:
# Linux/Mac - edit /etc/resolv.conf
sudo nano /etc/resolv.conf
# Add these lines:
nameserver 8.8.8.8
nameserver 8.8.4.4On Windows, change DNS in Network Adapter settings.
Clear your local DNS cache:
# macOS
sudo dscacheutil -flushcache; sudo killall -HUP mDNSResponder
# Windows
ipconfig /flushdns
# Linux (systemd)
sudo systemd-resolve --flush-cachesVerify basic internet access:
ping google.com
curl -I https://google.comIf these fail, resolve network issues first.
Sometimes restarting networking helps:
# Linux
sudo systemctl restart NetworkManager
# Or restart your router/modemAs a workaround, add registry IP to hosts file:
# Get current IP
nslookup registry.npmjs.org
# Add to /etc/hosts (Linux/Mac) or C:\Windows\System32\drivers\etc\hosts
104.16.x.x registry.npmjs.orgRemove this once DNS is fixed.
In Docker containers, DNS issues are common if the container uses the host's DNS configuration. Use --dns flag or configure Docker's daemon.json. For Kubernetes, check CoreDNS/kube-dns pod health. In WSL2, DNS can be problematic - check /etc/resolv.conf is correctly configured or regenerate it. Corporate environments may need specific internal DNS servers configured.
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