How to Pass Command Line Arguments to a Node.js Program

Introduction

Node.js is a powerful JavaScript runtime environment that allows developers to create server-side applications. It is often used to create web applications, but it can also be used to create command line applications. One of the most useful features of Node.js is the ability to pass command line arguments to a program. This allows developers to customize their programs and make them more flexible. In this article, we will discuss how to pass command line arguments to a Node.js program and how to access them in Node.

Passing Command Line Arguments to a Node.js Program

The easiest way to pass command line arguments to a Node.js program is to use the process.argv array. This array contains all of the command line arguments that were passed to the program. For example, if you run the following command:

node myprogram.js --name John --age 25

The process.argv array will contain the following values:

[ 'node', 'myprogram.js', '--name', 'John', '--age', '25' ]

You can then access the command line arguments by accessing the elements of the array. For example, to access the value of the –name argument, you can use the following code:

var name = process.argv[2];

This will set the name variable to the value of the –name argument, which is “John”.

Accessing Command Line Arguments in Node

Once you have passed the command line arguments to your Node.js program, you can access them in your code. To do this, you can use the process.argv array. This array contains all of the command line arguments that were passed to the program. For example, if you run the following command:

node myprogram.js --name John --age 25

You can access the –name argument by using the following code:

var name = process.argv[2];

This will set the name variable to the value of the –name argument, which is “John”.

Summary

In this article, we discussed how to pass command line arguments to a Node.js program and how to access them in Node. We saw that the easiest way to pass command line arguments to a Node.js program is to use the process.argv array. We also saw how to access the command line arguments in Node by using the process.argv array. By using these techniques, you can make your Node.js programs more flexible and customizable.