Hi a have problem with instalation upper-case module at Node. I follow the example https://www.w3schools.com/nodejs/nodejs_npm.asp but I got error:
I:\www\node>npm install upper-case
npm ERR! code SELF_SIGNED_CERT_IN_CHAIN
npm ERR! errno SELF_SIGNED_CERT_IN_CHAIN
npm ERR! request to https://registry.npmjs.org/upper-case failed, reason: self signed certificate in certificate chain
npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\jv233753\AppData\Roaming\npm-cache\_logs\2020-06-18T09_57_13_316Z-debug.log
What did I do wrong? THX