When I execute this script with these 2 arguments, it will check if the file exists or not inside that folder. The first argument is a path to a folder and the second argument is the name of a file. In my example, I have a script that accepts 2 command line arguments. So far You have learned about the process.argv property and how you can access arguments inside the Node.js script using this property. Additionally, it's a good practice to validate the command line arguments passed to your script and handle any errors that may arise.Īlso Read: How to Set and Get Cookies in Node.js Express Server Real-world Example of Using Command Line Arguments You can use JavaScript's built-in functions like parseInt() or parseFloat() to convert it to a number. If you need to use them as numbers or booleans in your script, you'll need to convert them to the appropriate data type. It's important to note that command line arguments are always passed as strings. my-script.jsĪs you can see, after applying the slice(2) method on the process.argv array, I am getting a new array that only contains arg1, arg2 and arg3 arguments. You can apply the slice() method to remove the first 2 items from the array and get a new array containing only the command line arguments passed to your script. For example, to access the arg1 argument, you can use process.argv, since process.argv and process.argv are the paths to the Node.js executable and the script you are executing, respectively. To access a specific argument, you can simply reference its index in the process.argv array. '/path/to/my-script.js', // path to the script being executed '/path/to/node', // path to the Node.js executable Now let's see how we can access those arguments inside the my-script.js file. I passed 3 arguments to the my-script.js file. In the previous section, you have seen how to pass arguments. You can pass as many arguments as you want to your script in this way.Īlso Read: Easiest Way to Set & Use Environment Variables (.env) in Node.js Accessing Arguments in Node.js Applications The arg1, arg2 and arg3 arguments will then be available in the process.argv array in the script, as we discussed earlier. You can pass any number of arguments to your script.įor example, if you have a Node.js script called my-script.js and you want to pass three arguments arg1, arg2 and arg3 to your script. To pass command line arguments in Node.js, all you need to do is specify the arguments after the script name when running the script in the command line. How to Pass Command Line Arguments in Node.js You'll find them after the first two items on the array. If you add any additional arguments when you run your script, those arguments will show up in the process.argv array. Here the first item is the path to the Node.js executable, and the second item is the path to the script that you are executing. This property is an array that contains all the argument values as the array items. Then you can access those arguments inside the script with the process.argv property. When you run a command-line tool or a JavaScript file using Node.js, you can pass the command-line arguments to it. We'll also see a simple real-world example that demonstrates how this feature can be used to build a useful command-line tool. In this post, you will understand what this process.argv property is, how you can pass arguments to a Node.js application, and how to access those arguments. We can get any argument from this array using its index. It is an array that stores all the arguments as strings. Node.js provides a way to access the command line arguments using the process.argv property. COMMAND Line Arguments in JAVA HINDI | JAVA Programming
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