How to parse user scripts on the site?

Question

JavaScript

Good afternoon,
I saw on different sites (for example, in Node-Red) such functionality that the user can write a simple js function, where it receives data, for example, from a post request, parses it according to the algorithm in this function, and then returns the result in json.
I can't google properly. Tell me, please, in which direction to dig in order to implement this?
Thanks in advance.

Answer 1

As I understand it, you need to turn the text entered by the user into a function.
https://learn.javascript.ru/new-function
I somehow did something like this for fun - ksp.herokuapp.com/rline (you can set the function for calculating the coordinates of each new step of the snake, see what happened and meditate). Right there through new Function