window is not defined error in js node.js

Question

I have this simple code:

do {
    var SioNo = window.prompt("Nicholas ha il cancro, si o no?");
} while (SioNo.toLowerCase() != "si" && SioNo.toLowerCase() != "no");

if (SioNo.toLowerCase() == "si") {
    console.log("Hai il cancro lol");
}
else {
    console.log("ahahahah si come no");
}

It's my first time coding in js so i don't really know what to do, i'm using node.js last version and VSCode

This is the error:

ReferenceError: window is not defined

at Object. <anonymous (i:.Documenti\Scuola\as_20_21\Informatica\JavaScript\Esercizio1\HelloWorld.js:2:17)

at Module._compile (internal/modules/cjs/loader.js:1068:30)

at Object.Module._extensions..js (internal/modules/cjs/loader.js:1097:10)

at Module.load (internal/modules/cjs/loader.js:933:32)

at Function.Module._load (internal/modules/cjs/loader.js:774:14)

at Function.executeUserEntryPoint [as runMain] (internal/modules/run_main.js:72:12)

at internal/main/run_main_module.js:17:47

Answer 1

window is only found in Browsers (Chrome, Firefox, Safari etc).

Executing the above script using node without extra packages will not work as the window variable simply does not exist in the current context (that is your terminal window).

If you want to do a prompt in NodeJS, which will accept user input from the terminal you can use a native package readline .

Here's a solution using recursion instead of a do...while loop.

const readline = require("readline");

const rl = readline.createInterface({
  input: process.stdin,
  output: process.stdout,
});

function askQuestion() {
  rl.question("Nicholas ha il cancro, si o no?", function (result) {
    if (result.toLowerCase() === "si") {
      console.log("Hai il cancro lol");
      process.exit(1);
    } else {
      console.log("ahahahah si come no");
      askQuestion();
    }
  });
}

askQuestion();

Since it is your first time using JavaScript / NodeJS, I would recommend going through tutorials and reading the documentation first. https://developer.mozilla.org/en-US/docs/Learn/JavaScript/First_steps .

Answer 2

Actually I am new in Node js but I have search for the reason. I founded that "window" does not recognized in Node.js, so try this solution by import this library "react" and then use the variable "window" and see if it is recognized:

import React from "react";

read this for more details: https://morioh.com/p/f7b08fe33a67