Using npm behind corporate proxy .pac

I've just had a very similar problem, where I couldn't get npm to work behind our proxy server.

My username is of the form "domain\username" - including the slash in the proxy configuration resulted in a forward slash appearing. So entering this:

npm config set proxy "http://domain\username:password@servername:port/"

then running this "npm config get proxy" returns this: http://domain/username:password@servername:port/

Therefore to fix the problem I instead URL encoded the backslash, so entered this:

npm config set proxy "http://domain%5Cusername:password@servername:port/"

and with this the proxy access was fixed.

Look for the url of the pack file in internet explorer lan settings and download the pack file. The pac file is just a javascript file with a function named FindProxyForURL which returns different proxy hosts in different scenarios.

Try to find a host in that pac file which you think is for general web traffic and plug it into .npmrc in C:\Users\<username>\.npmrc

proxy=http://<username>:<pass>@proxyhost:<port>
https-proxy=http://<uname>:<pass>@proxyhost:<port>

Even though you may login with your domain and username on your corporate machine It is highly possible that the user domain name is not required for the proxy, only the username and password (which may be different than your Active Directory login)

Don't foget to fiddle with escaping special password characters.

just download your .pac file. open it in any editor. and look for PROXY = "PROXY X.X.X.X:80; you may have many proxy copy any one of them then run following cmds

npm config set proxy=http://X.X.X.X:80/  
npm config set https-proxy http://X.X.X.X:80;

then try to install your desired package. it works

You will get the proxy host and port from your server administrator or support.

After that set up

npm config set http_proxy http://username:password@proxyofmycomp.com:itsport
npm config set proxy http://username:password@proxyofmycomp.com:itsport

If there any special character in password try with % urlencode. Eg:- pound(hash) shuold be replaced by %23.

This worked for me...