npm install error - invalid package.json

C:\Program Files\nodejs>npm cache verify

Fixes it on Windows 10, run it with an Administrator command prompt Window.

Use this command to fix package.json related issue.

npm cache clean

The error means exactly what it states, the JSON in your package.json is not valid and can't be parsed properly. Change "debug" "~0.7.2" to "debug": "~0.7.2".