ng generate component giving error "Unexpected token / in JSON at position 629"

Check if you accidentally made a comment. Open up angular.json and look for '/' on the line or 'position' specified. JSON does not support comments.

I also had same problem, when I trying to create component and after googling, I found https://jsonlint.com/ and which validate your JSON files and it points to the exact line and error.

For more information, please refer to following thread: https://github.com/angular/angular-cli/issues/10880

Cheers!