NPM complains: Unable to verify the "the" "Certificate

NPM Install always complains: Unable to verify of the first certificate (unable to verify the primary certificate), check the discovery

As of February, 2017, NPM no longer supports its self-signed certificates.

February 27, 2017, NPM no longer supports self-signed certificates.

Because NPM install is going with the HTTPS protocol, a digital certificate is required to guarantee solution 1:

Canceling SSL authentication: NPM Config set Strict-ssl false

If it is not successful, replace the NPM source with a domestic mirror:
NPM Config Set Registry http://registry.cnpmjs.org/

NPM Config Set Registry http://registry.npm.taobao.org/

TAOBAONPM Mirror website: https://npm.taobao.org/ solution 2:

Upgrade: NPM Install Npm-g--ca=null
or NPM config set ca= ""

Recommended Use Method 1