Saving a 2-dimensional array in a .json file using javascript

For IMMOinvent* I was looking for a solution to save an array as .json-formatted file using plain javascript. The solution can be found here: https://stackoverflow.com/questions/78007884/how-to-save-a-two-dimensional-array-in-a-json-file-using-javascript

* IMMOinvent is a web-based application to analyse the energy demand and potential greenhouse gas emissions of large municipal real-estate portfolios.