REPL stands for Read Eval Print Loop. It basically represents a computer environment like Linux/Unix terminal, window console, etc.
It comes with a Nodejs package so you do not need to install it separately.
firstly open the terminal
run the node command
now You will see the REPL Command prompt > where you can type any Node.js command
$ node >
// Add the two string
> "John"+" "+"Roser" John Roser
// Add the numeric value
Note:- to terminate the command we use ctrl+c