How to fix npm ERR! code EINVALIDPROXY npm ERR! Invalid proxy configuration in npm

View your current npm configuration to identify the problematic proxy settings:

npm config list

Also check if proxy is set in environment variables:

# On Linux/macOS
echo $http_proxy
echo $https_proxy

If you're not behind a proxy or have invalid configuration, remove the proxy settings:

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

If you need a proxy, ensure it follows the correct format:

# Basic format (no auth)
npm config set proxy http://proxyhost.com:8080
npm config set https-proxy http://proxyhost.com:8080

# With authentication
npm config set proxy http://username:[email protected]:8080

Note: Always use http:// prefix for both proxy and https-proxy, not https://.

If your proxy password contains special characters, they must be URL-encoded:

- @ → %40
- # → %23
- : → %3A
- \\ → %5C

Example: If password is pass@word#123, set it as:

npm config set proxy http://user:pass%40word%[email protected]:8080

If npm config commands don't work, manually edit your .npmrc file at ~/.npmrc:

proxy=http://proxyhost.com:8080
https-proxy=http://proxyhost.com:8080
strict-ssl=false