nodejs command line arguments

What are Node.js Command Line Arguments?#

Node.js is an open source, cross-platform, back-end JavaScript runtime environment that executes JavaScript code outside of a web browser.

Command line arguments are used to pass data or options to a Node.js application at the time of its execution.

Node.js command line arguments are accessed using the process.argv property, which is an array that contains the command line arguments passed to the Node.js process.

How to Access Node.js Command Line Arguments?#

To access Node.js command line arguments, you can use the following code:

        process.argv.forEach((val, index) => {
            console.log(`${index}: ${val}`);
        });
    

The above code will log all the command line arguments passed to the Node.js process in the console.

How to Pass Command Line Arguments to a Node.js Application?#

To pass command line arguments to a Node.js application, you can use the following syntax:

        node app.js arg1 arg2 arg3 ...
    

In the above syntax, app.js is the name of the Node.js application and arg1 arg2 arg3 ... are the command line arguments.

How to Parse Command Line Arguments in a Node.js Application?#

To parse command line arguments in a Node.js application, you can use the following code:

        const args = process.argv.slice(2);
        console.log(args);
    

The above code will extract all the command line arguments passed to the Node.js application and store them in an array called args.

You can then use various array methods to manipulate the command line arguments as per your application requirements.

Conclusion#

Node.js command line arguments are a powerful way to pass data or options to a Node.js application at the time of its execution. By using the process.argv property, you can access and manipulate the command line arguments in your Node.js application.