Installation of certificate in npm
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Preferred option
Following the instructions Installation of certificate in all Node products will solve the problem effectively.
Second option
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
Third option
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