For those learning Nodejs, here is a tutorial on how to handle HTTP POST requests.

I recommend you start by taking a look at frameworks such as Express.

https://expressjs.com/en/starter/installing.html

Express' "Getting started" guide showcases a cut-and-paste example of how to route POST requests in its section on basic routing.

https://expressjs.com/en/starter/basic-routing.html

Once you get that up and running, I recommend you onboard onto cross-origin resource sharing (CORS), which is used to protect against cross-site request forgery (CSRF) attacks. POST is considered an unsafe method by default, as it's typically used to cause side-effects on server data, and you might be forced to support ways to mitigate those attacks, such as supporting CSRF tokens.