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

It provides a way to run JavaScript on the server side and perform various tasks, including building web servers, command-line tools, and desktop applications. Here’s how you can run a JavaScript file in Node.js:

1. Install Node.js: If you don’t have Node.js installed on your system, you’ll need to download and install it first. You can download it from the official Node.js website (https://nodejs.org).

2. Create a JavaScript file: Create a new file with a .js extension and write your JavaScript code in it. For example, let’s say you create a file called index.js and write the following code:

3. Open Terminal: Open your system’s terminal or command prompt and navigate to the directory where your JavaScript file is located. You can use the ‘cd’ command to change directories.

4. Run the File: Once you’re in the directory, type the following command in the terminal:

This will execute the JavaScript code in the index.js file, and the output “Hello, World!” will be displayed in the terminal.

5. Advanced Options: You can also pass command-line arguments to your Node.js script by appending them after the script name. For example:

This will pass two arguments (arg1 and arg2) to your script. You can access these arguments using the ‘process.argv’ array in your JavaScript code.

Running a JavaScript file in Node.js is straightforward. You need to create a JavaScript file with .js extension, navigate to the file directory in the terminal and execute the file with “node filename.js” command. Additionally, you can pass command-line arguments to your script and use them in your JavaScript code. Cheaper Node.js hosting options are available for those seeking affordable solutions. It offers scalability and support for Node.js applications without breaking the bank.