Unexpected end of JSON input while parsing near '...ross-env":"^3.1.0","e' code example

Example 1: npm ERR! Unexpected end of JSON input while parsing near '...ty":"sha512-2GTXt3b2Q'

npm cache clean --force

Example 2: 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