Scrap https://www.nufusune.com/ data.

main.js

import { DOMParser } from "https://deno.land/x/deno_dom/deno-dom-wasm.ts";

const capitalize = str => str.charAt(0).toLocaleUpperCase("tr-TR") + str.slice(1).toLocaleLowerCase("tr-TR");

const parser = new DOMParser();
const fetchDocument = path => fetch("https://www.nufusune.com/" + path)
    .then(response => response.text())
    .then(text => parser.parseFromString(text, "text/html"));

const indexOfDistricts = await fetchDocument("ilceler");
const anchors = indexOfDistricts.querySelectorAll('td[data-label="İL ADI"] a');

const promises = Array.from(anchors).map(async anchor => {
    const href = anchor.getAttribute("href");
    const cityId = href.slice(0, -9);
    const cityName = capitalize(anchor.textContent.slice(0, -9));

    const districts = await fetchDocument(href).then(async document => {
        const anchors = document.querySelectorAll('td[data-label="İLÇELERİ"] a');

        const promises =  Array.from(anchors).map(async anchor => {
            const href = anchor.getAttribute("href");
            const districtId = href.slice(0, -(21 + cityName.length));
            const districtName = capitalize(anchor.textContent);

            const neighborhoods = await fetchDocument(href).then(async document => {
                const neighborhoods = Array.from(document.querySelectorAll("#ikiye1 li a"))
                    .map(anchor => capitalize(anchor.textContent.slice(0, -10)));

                const villages = Array.from(document.querySelectorAll("#ikiye2 li a"))
                    .map(anchor => capitalize(anchor.textContent.slice(0, -5)));

                return neighborhoods.concat(villages);
            });

            return { id: districtId, name: districtName, neighborhoods }
        })

        return await Promise.all(promises);
    });

    return { id: cityId, name: cityName, districts }
});

const data = await Promise.all(promises);
Deno.writeTextFile("./data.json", JSON.stringify(data));