npm ERR! Unexpected end of JSON input while parsing near '...s.org/ajv/-/ajv-5.5.1' code example

Example 1: SyntaxError: Unexpected end of JSON input while parsing near '...version":"2.0.6","devD' cli

npm cache clean --force
then run npm i

Example 2: npm ERR! Unexpected end of JSON input while parsing near '...r\nComment: https://o'

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

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