This command will check the registry to see if any (or, specific) installed packages are currently outdated and print the changelog.
$ npm install -g outdatedlog
Show changelogs for all outdated packages
$ outdatedlog
Show changelogs for all outdated packages including unwanted versions
$ outdatedlog -a
Show changelogs for all outdated global packages
$ outdatedlog -g
Show changelogs for an outdated package (ie. with npm)
$ outdatedlog npm
Show changelogs for a list of outdated packages (ie. with npm and express)
$ outdatedlog npm express