How do I make a .txt, that contain all the data of a map

Hello!!! I want to make pressing a button open a text box, then put the name of the map, then press a button and the map will be saved in .txt, somewhere in the internal memory, please help I am beginner

(Sorry for my English)

Is it 100% necessary to store it as a *.txt file? Will the user need / want to have access to this file? If not, try using Local Storage to store the string that you would have stored in the *.txt.

Otherwise, you'll have to rely on NWJS (so desktop-only, there probably won't be a mobile solution for this). It can read and write text files effectively.

Well it does not have to be .txt, as long as I save a file with the map, no matter the extension

If it's a file, and it's only containing the map, I'd recommend the JSON format, as it's more usable by C2. That said, you can just use NWJs with your *.txt

thank you very much!!!