javascript – How to tell if node.js is installed or not

Open a terminal window.
Type:

node -v

This will display your nodejs version.

Navigate to where you saved your script and input:

node script.js

This will run your script.

open a terminal and enter

node -v

this will tell you the version of the nodejs installed, then run nodejs simple by entering

node

Prompt must be change. Enter following,

function testNode() {return Node is working}; testNode();

command line must prompt the following output if the installation was successful

Node is working

Please try this command node –version or node -v, either of which should return something like v4.4.5.