NPM self_signed_cert_in_chain

If you’re behind the corporate proxy (which uses e.g. Blue Coat), you should use http instead of https for repository addresses, e.g.

npm config set registry="http://registry.npmjs.org/"

^{See: Error: SSL Error: SELF_SIGNED_CERT_IN_CHAIN while using npm.}

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You can also import failing self-certificate into your system and mark as trusted, or temporary disable SSL validation while installing packages (quick, but not recommended method):

npm config set strict-ssl false

^{See: Error: SSL Error: SELF_SIGNED_CERT_IN_CHAIN while using npm.}

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The recommended way (and more painful) is just to point to the right certificate file, e.g.

npm config set cafile "<path to your certificate file>"

^{See: How to fix SSL certificate error when running Npm on Windows?.}