$ sudo apt-get update
$ sudo apt-get install libjs-simple-fmt 

libjs-simple-fmt is installed in your system.

Make ensure the libjs-simple-fmt package were installed using the commands given below,

$ sudo dpkg-query -l | grep libjs-simple-fmt *

You will get with libjs-simple-fmt package name, version, architecture and description in a table

libjs-simple-fmt package basic information: