You can get command line arguments passed to your node.js application by using
process.argv. process.argv is actually an array. So if you want values, out of
this array you'll either have to use loop or you can get simply by putting array
index in process.argv.
Suppose you have a node.js app. "myscript.js".
You have passed parameters as:
$node myscript.js 4
Then in the code as in line number 2 of below code, we can get parameter value
as process.argv[2].
function GetSqrt(){
var num = process.argv[2];
console.log(" Number is " + num + " and its square " + num * num);
}
GetSqrt();
You might be thinking, why i have given index number 2 and not 0. Actually
process.argv[0] will return 'node' and process.argv[1] will return your script
name as in this case myscript.js.
If you have multiple arguments to pass from command prompt, you can create a
separate method for argument parsing as like
function GetSqrt(){
var args =
ParseArguments();
args.forEach(function(num){
console.log(" Number is " + num + " and its square " + num * num);
})
}
GetSqrt();
function ParseArguments()
{
var input = [];
var arguments =
process.argv;
arguments.slice(2).forEach(function (num) {
input.push(num);
});
return input;
}
Here arguments.slice(2) will remove first two arguments(node and your
application name) from arguments array