index.js

const fs = require("fs");

module.exports.index = async (req, res, next) => {
    const rawcity = req.query.kota;

    let city;
    if (rawcity) {
        city = rawcity.toLowerCase()
            .split(' ')
            .map((s) => s.charAt(0).toUpperCase() + s.substring(1))
            .join(' ');
    } else {
        res.send("parameter kota tidak boleh kosong");
    }

    fs.readFile('cache/weather.json', (err, data) => {

        let weather = JSON.parse(data.toString());
        let weatherData = weather.filter((element) => element.kota.includes(city));

        if (weatherData.length > 0) {
            res.send(weatherData[0]);
        } else {
            res.send("kota tidak ditemukan");
        }

    });
};