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How to read command line arguments in Node ?

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Command-line arguments (CLI) consist of text strings utilized to provide extra information to a program during its execution via the command line interface of an operating system. Node facilitates the retrieval of these arguments through the global object, specifically the process object.

Below are the examples that give a better understanding:

Example 1: The code captures and logs the command-line arguments passed to a Nodejs script using `process.argv`. It outputs the array, including the script name and additional arguments, with `console.log(arguments);`.

Javascript

var arguments = process.argv;
console.log(arguments);

                    

Steps to run the app:

node index.js

Output:Output of above command

The process.argv contains an array where the 0th index contains the node executable path, 1st index contains the path to your current file and then the rest index contains the passed arguments.

Example 2: Program to add two numbers passed as arguments:

Javascript

var arguments = process.argv
 
function add(a, b) {
    // To extract number from string
    return parseInt(a)+parseInt(b)
}
var sum = add(arguments[2], arguments[3])
console.log("Addition of 2, 3 is ", sum)

                    

Steps to run the app:

node index1.js 2 3

Output:Output of above command

So this is how we can handle arguments in Node. The args module is very popular for handling command-line arguments. It provides various features like adding our own command to work and so on.


Last Updated : 25 Jan, 2024
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