How do I pass command line arguments to a Node.js program?

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I have a web server written in Node.js and I would like to launch with a specific folder. I’m not sure how to access arguments in JavaScript. I’m running node like this:

$ node server.js folder

here server.js is my server code. Node.js help says this is possible:

$ node -h
Usage: node [options] script.js [arguments]

How would I access those arguments in JavaScript? Somehow I was not able to find this information on the web.

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