NPM behind a proxy with the character “@” in my pa

Question

I am trying to set NPM (v9.4.0) proxy but I am facing the following error when running npm i -g npm@latest:

npm ERR! code E407
npm ERR! 407 Proxy Authentication Required: npm@latest

The password I use for the proxy contains an "@" character an I suspect this is the root cause of the issue. I tried with a "\" before the "@" and also

npm config set proxy http://"user:MyP@ssword"@proxy.big.corp.fr:8080
npm config set https-proxy http://"user:MyP@ssword"@proxy.big.corp.fr:8080

but without success. Does anyone have an idea?

Answer 1

You can also convert your password to BASE64 encode

npm config set proxy http://<user>:<base64 password>@proxy.big.corp.fr:8080

Sample:

npm config set proxy http://myuser:bXlwYXNzd29yZA==@proxy.big.corp.fr:8080

To convert use site https://www.base64encode.org/

Answer 2

I checked and found, in my company, an anonymous proxy exists. This also solved my problem.

Answer 3

After many research about this problem and test more than 10 solutions like set with this commands:

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

but not worked for me. then test CNTLM but CNTLM didn't work for me. I tried all possible combinations. NPM was giving Authentication error. finally i test Fiddler and saved my time. It is easy to install and configure. Open Fiddler => Rule => Automatically Authenticated.

Open C:\Users\your username\.npmrc file and use this configurations

registry=http://registry.npmjs.org

proxy=http://127.0.0.1:8888

https-proxy=http://127.0.0.1:8888

http-proxy=http://127.0.0.1:8888

strict-ssl=true

remove npm folder in this path C:\Users\your username\AppData\Roaming. Using following command:

npm install express npm uninstall -g @angular/cli npm cache clean --force npm install -g @angular/cli