לעברית לחצו כאן
In windows install the security certificate software, and then run this command:
npm config -g set cafile %programdata%\netfree\ca\netfree-ca-bundle-curl.crt
In other operating systems download the file from here, extract its contents, save in a fixed location, and Write the command in a way that you point to the file.
In linux, if you installed the certificate according to the instructions here write this command:
npm config -g set cafile /usr/lib/ssl/certs/ca-certificates.crt
To uninstall the certificate run this command.
npm config -g delete cafile
You can disable the need for Security certificate, by setting npm to use with the http protocol.
Run the following command:
npm config set registry http://registry.npmjs.org