NodeJS process.argv command line arguments

process.argv is an array containing the command line arguments. The first element will be node, the second element will be the name of the JavaScript file. The next elements will be any additional command line arguments.

Code Example:

Output sum of all command line arguments

index.js

var sum = 0;
for (i = 2; i < process.argv.length; i++) {
	sum += Number(process.argv[i]);
}

console.log(sum);

Usage Exaple:

node index.js 8 4 7 6

Output will be 25

A brief explanation of the code:

Here in for loop for (i = 2; i < process.argv.length; i++) loop begins with 2 because first two elements in process.argv array always is ['path/to/node.exe', 'path/to/js/file', ...]

Converting to number Number(process.argv[i]) because elements in process.argv array always is string