This package aim to lock the versions of your depencencies, so You will never run into cascade dependency bugs and will eliminate fears running npm install.
Install dependency-locker running:
$ [sudo] npm install dependency-locker [-g]
Dependency-locker can be started just running into your project folder
$ dependency-locker [-r]
the option -r allows to rewrite the package.json; by the way if a file _package.json is not found will be created with a backup of your package.json; withour the -r option a package_solved.json will be written.