Скачать или смотреть How to Read User Input Directly in Node.js

Learn how to handle user input in Node.js using `process.argv`. This guide explains how to read command-line arguments effectively.
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This video is based on the question https://stackoverflow.com/q/71091056/ asked by the user 'Bin Rohan' ( https://stackoverflow.com/u/10054965/ ) and on the answer https://stackoverflow.com/a/71091070/ provided by the user 'Palladium02' ( https://stackoverflow.com/u/18057908/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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Introduction

When developing applications in Node.js, handling user input is crucial, whether it's for interactive command-line applications or backend services. A common approach to read input is through the readline module, but there are more flexible ways, especially when it comes to reading input directly from the command line. In this article, we’ll explore how to read user input directly from command-line arguments using process.argv.

The Problem

You may have encountered situations where you want to execute a Node.js script from the command line and provide some input directly with it. For example, if you run:

[[See Video to Reveal this Text or Code Snippet]]

You would want your application to respond with:

[[See Video to Reveal this Text or Code Snippet]]

This requires a different method of capturing user input compared to the typical readline interface. So, how do we read command-line arguments in Node.js?

Understanding process.argv

The solution lies in the process.argv array, which provides access to the command-line arguments when your Node.js application starts. Here’s a breakdown of how it works:

What is process.argv?

It is an array containing the command-line arguments passed when your application is executed.

The first element (process.argv[0]) is the path to the Node.js executable.

The second element (process.argv[1]) is the path to the script being executed.

The subsequent elements (from index 2 onward) represent any additional arguments passed to your script.

Example of Using process.argv

Let's write a simple example to illustrate how to access these command-line arguments to greet the user.

[[See Video to Reveal this Text or Code Snippet]]

How to Run

To run this script and pass your name as an argument, you would type:

[[See Video to Reveal this Text or Code Snippet]]

This command will output:

[[See Video to Reveal this Text or Code Snippet]]

Summary

Using process.argv is a powerful way to handle user input directly from the command line in Node.js. Here are the key takeaways:

process.argv gives you access to command-line arguments.

The first two elements in the array are reserved for the Node executable and the script path, while any subsequent elements are user-defined arguments.

This method allows for a straightforward way to pass data to your Node.js applications without using the readline module.

With this knowledge, you can create more interactive and user-friendly command-line applications in Node.js. Feel free to explore and enhance your application's capabilities by utilizing this feature!