$ sudo apt-get remove libjson-perl 

Uninstall libjson-perl including dependent package

If you would like to remove libjson-perl and it's dependent packages which are no longer needed from Ubuntu,

$ sudo apt-get remove --auto-remove libjson-perl 

Use Purging libjson-perl

If you use with purge options to libjson-perl package all the configuration and dependent packages will be removed.

$ sudo apt-get purge libjson-perl 

If you use purge options along with auto remove, will be removed everything regarding the package, It's really useful when you want to reinstall again.

$ sudo apt-get purge --auto-remove libjson-perl 

See Also,