Unexpected end of JSON input while parsing near '...ent: https://openpgpj' code example

Example 1: npm ERR! Unexpected end of JSON input while parsing near '...r\nComment: https://o'

npm cache clean --force
npm install -g @angular/cli

Example 2: Unexpected end of JSON input while parsing near '...fcd15e632426a1be","ta'

npm cache clean --force

Example 3: Unexpected end of JSON input while parsing near

Open Windows Powershell as admin
npm cache clean --force
solved the problem for me

Alternative : You can use yarn instead
npm install -g yarn