Formalar va validatsiya

import express from "express";

const app = express();

app.use(express.json());
app.use(express.urlencoded({ extended: true }));

app.post("/qabul", (sorov, javob) => {
    javob.json({ turi: sorov.get("content-type"), tana: sorov.body });
});

const server = app.listen(0);
const port = server.address().port;
const asos = `http://localhost:${port}/qabul`;

const json = await fetch(asos, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ ism: "Malika", yosh: 20 }),
});
console.log(await json.json());

const forma = await fetch(asos, {
    method: "POST",
    headers: { "Content-Type": "application/x-www-form-urlencoded" },
    body: new URLSearchParams({ ism: "Aziza", yosh: "19" }),
});
console.log(await forma.json());

server.close();

function talabaniTekshir(malumot) {
    const xatolar = {};

    const ism = String(malumot.ism ?? "").trim();
    if (ism.length < 2) {
        xatolar.ism = "ism kamida 2 belgidan iborat bo'lsin";
    } else if (ism.length > 50) {
        xatolar.ism = "ism 50 belgidan oshmasin";
    }

    const ball = Number(malumot.ball);
    if (!Number.isInteger(ball)) {
        xatolar.ball = "ball butun son bo'lsin";
    } else if (ball < 0 || ball > 100) {
        xatolar.ball = "ball 0 va 100 orasida bo'lsin";
    }

    return { toza: { ism, ball }, xatolar };
}

console.log(talabaniTekshir({ ism: "  Malika  ", ball: "88" }));
console.log(talabaniTekshir({ ism: "M", ball: 150 }));
console.log(talabaniTekshir({}));

import express from "express";

const app = express();
app.use(express.json());

function tekshir(malumot) {
    const xatolar = {};
    const ism = String(malumot.ism ?? "").trim();
    if (ism.length < 2) xatolar.ism = "juda qisqa";

    const ball = Number(malumot.ball);
    if (!Number.isInteger(ball) || ball < 0 || ball > 100) {
        xatolar.ball = "0 va 100 orasida butun son bo'lsin";
    }
    return { toza: { ism, ball }, xatolar };
}

app.post("/talabalar", (sorov, javob) => {
    const { toza, xatolar } = tekshir(sorov.body ?? {});

    if (Object.keys(xatolar).length > 0) {
        javob.status(422).json({ xato: "tekshiruvdan o'tmadi", xatolar });
        return;
    }

    javob.status(201).json({ yaratildi: toza });
});

const server = app.listen(0);
const port = server.address().port;
const asos = `http://localhost:${port}/talabalar`;

const yubor = async (tana) => {
    const j = await fetch(asos, {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify(tana),
    });
    return [j.status, await j.json()];
};

console.log(await yubor({ ism: "Nodira", ball: 91 }));
console.log(await yubor({ ism: "X", ball: 500 }));

server.close();

import express from "express";

const app = express();
app.use(express.json());

app.post("/", (s, j) => j.json({ holat: "qabul qilindi" }));

app.use((xato, sorov, javob, keyingi) => {
    if (xato instanceof SyntaxError && "body" in xato) {
        javob.status(400).json({ xato: "JSON o'qib bo'lmadi" });
        return;
    }
    javob.status(500).json({ xato: "ichki xato" });
});

const server = app.listen(0);
const port = server.address().port;

const buzuq = await fetch(`http://localhost:${port}/`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: "{ bu json emas",
});

console.log(buzuq.status, await buzuq.json());

server.close();

function faqatRuxsatEtilgan(malumot, ruxsat) {
    const natija = {};
    for (const kalit of ruxsat) {
        if (kalit in malumot) natija[kalit] = malumot[kalit];
    }
    return natija;
}

const kelgan = {
    ism: "Malika",
    ball: 88,
    rol: "admin",
    id: 999,
};

console.log(faqatRuxsatEtilgan(kelgan, ["ism", "ball"]));

function tozala(matn) {
    return String(matn ?? "")
        .trim()
        .replace(/\s+/g, " ")
        .slice(0, 100);
}

console.log(`"${tozala("   Malika    Karimova  ")}"`);
console.log(`"${tozala(null)}"`);
console.log(tozala("a".repeat(200)).length);

function emailTogrimi(email) {
    const t = String(email ?? "").trim().toLowerCase();
    return /^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(t) ? t : null;
}

console.log(emailTogrimi("  [email protected] "));
console.log(emailTogrimi("notogri"));