How do I resolve a cert error when installing npm packages?

Question

When installing npm packages, I get the following error:

npm ERR! errno UNABLE_TO_VERIFY_LEAF_SIGNATURE
npm ERR! request to https://registry.npmjs.org/nodemon failed, reason: unable to verify the first certificate        

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\dell\AppData\Roaming\npm-cache\_logs\2021-10-05T18_19_37_371Z-debug.log

how do I resolve it?