How to parse command line arguments in NodeJS?
The easiest way to parse command line arguments in NodeJS is to use the stdio module. Inspired by the UNIX getopt utility, it is as trivial as follows:
Table of Contents
How to make a Node.js CLI program interactive?
How to make a Node.js CLI program interactive? Node.js since version 7 provides the readline module to do exactly this: get information from a readable stream such as the process.stdin stream, which during execution of a Node.js program is terminal input, one line at a time .
How to accept input from command line in Node.js?
Node.js since version 7 provides the readline module to do exactly this: get information from a readable stream such as the process.stdin stream, which during execution of a Node.js program is terminal input, one line at a time . This code snippet asks for the username, and once the text is entered and the user hits enter, we send a greeting.
How does the readline module work in Node.js?
Node.js since version 7 provides the readline module to do exactly this: get information from a readable stream such as the process.stdin stream, which during execution of a Node.js program is terminal input, one line at a time .
How to access argument values in Node.js?
This is very similar to how bash scripts access argument values and is already provided as standard with node.js, as MooGoo pointed out. (Just to make it understandable for someone who is new to node.js)
How to normalize arguments in Node.js shell?
To normalize the arguments as a regular javascript function would receive them, I do this in my node.js shell scripts: Note that the first argument is usually the path to nodejs, and the second argument is the location of the script you’re running. The updated correct answer for this is to use the minimist library.
How are arguments separated on a command line?
The arguments are usually separated by a space; however, there are some runtimes that use commas to distinguish between multiple command line arguments. Also, depending on the program, you can pass arguments in the form of key-value pairs, which we’ll cover later in this article.