Forem: Barkamol Valiev

Managing JWT Logout with Blacklists and Redis: A Beginner-Friendly Guide

Barkamol Valiev — Fri, 03 Jan 2025 11:41:57 +0000

When building secure APIs with JWT (JSON Web Tokens), handling user logout can be tricky. Since JWT is stateless, there’s no out-of-the-box way to invalidate tokens after logout. That’s where blacklists and tools like Redis come into play. If you’re new to these concepts, don’t worry! This guide will explain everything step by step and help you implement a practical solution.

Understanding Statelessness and JWT

Stateless Systems

Stateless systems don’t store any user session information on the server.
Each request carries all the necessary data (e.g., a JWT) for the server to process it.

JWT

JWT contains user data (like id and role) and is signed by the server.
Once issued, the server doesn’t need to store the token or session details.
Problem: If a user logs out, their JWT remains valid until it expires.

What is a Blacklist?

A blacklist is a list of tokens that have been invalidated. When a user logs out, their token is added to this list. Every time a request is made, the server checks if the token is in the blacklist. If it is, the request is rejected.

Steps to Implement a Blacklist:

Store invalidated tokens in a data structure (e.g., an array, Set, or database).
When processing requests, verify the token is not in the blacklist.
Add a cleanup mechanism to remove expired tokens from the blacklist.

Why Redis?

Redis is a high-performance, in-memory key-value database. It’s perfect for use cases like blacklisting JWTs because:

Speed: Redis can handle thousands of read/write operations per second.
Distributed: Multiple servers can share the same Redis instance for consistent data.
TTL (Time-to-Live): Redis can automatically remove entries after a specified duration.

How to Start Without Redis

If you’re new to these concepts, start with a simple in-memory solution:

const blacklist = new Set();

// Add token to blacklist
authController.logout = (req, res) => {
  const token = req.headers.authorization.split(" ")[1];
  blacklist.add(token);
  res.status(200).json({ message: "Logged out successfully" });
};

// Middleware to check token validity
middleware.verifyToken = (req, res, next) => {
  const token = req.headers.authorization.split(" ")[1];
  if (blacklist.has(token)) {
    return res.status(401).json({ message: "Invalid token" });
  }
  next();
};

This approach works for small-scale projects but has limitations. If your app scales, you’ll need a more robust solution like Redis.

Getting Started with Redis

1. Install Redis

Install Redis locally: Redis Installation Guide
Alternatively, use a cloud service like AWS Elasticache or Redis Cloud.

2. Integrate Redis in Node.js

Use the ioredis library to interact with Redis in your Node.js app:

npm install ioredis

const Redis = require("ioredis");
const redis = new Redis();

// Add token to Redis with TTL
const logout = async (req, res) => {
  const token = req.headers.authorization.split(" ")[1];
  const expiresIn = 3600; // 1 hour
  await redis.setex(token, expiresIn, "blacklisted");
  res.status(200).json({ message: "Logged out successfully" });
};

// Middleware to check Redis blacklist
const verifyToken = async (req, res, next) => {
  const token = req.headers.authorization.split(" ")[1];
  const isBlacklisted = await redis.get(token);
  if (isBlacklisted) {
    return res.status(401).json({ message: "Invalid token" });
  }
  next();
};

Redis vs In-Memory

Feature	In-Memory (`Set`)	Redis
Scalability	Limited to a single server	Distributed across servers
Speed	Very fast	Equally fast
Persistence	Lost on server restart	Data persists across restarts
Cleanup	Manual	Automatic with TTL

Next Steps

Learn Redis Basics: Understand commands like SETEX, GET, and DEL.
Secure Redis: Use authentication and IP whitelisting.
Optimize Blacklist: Store only token hashes for added security.

Starting simple with an in-memory solution and gradually transitioning to Redis ensures you don’t get overwhelmed. Happy coding!

Let me know in the comments if you have any questions or need help with Redis setup. 🚀

Node backend port band bo'lib qolishi

Barkamol Valiev — Wed, 01 Jan 2025 07:01:39 +0000

Siz Node.js serveringizni ishga tushirganingizda, "Port allaqachon ishlatilmoqda" degan xatoni ko'rganmisiz? 🚖 Bu juda bezovta qiladi, lekin buni hal qilishning oson yo'li bor!

Ushbu postda men sizga portfiner paketini ishlatib, bo'sh portni qanday topishni ko'rsataman, shunda serveringiz har doim ishlayveradi.

🛠️ Muammo: Port nomutanosibligi

Defolt holatda, ko'plab serverlar process.env.PORT yoki fallback sifatida 3000 portini ishlatadi. Ammo agar bu port allaqachon band bo'lsa, ilovangiz ishga tushmaydi. Shuning uchun, keling, biz bo'sh portni dinamik tarzda topamiz.

🗰️ Yechim:`portfinder` ishlatish

Install `portfinder`

Avvalo, portfinder paketini loyihangizga qo'shing:

npm install portfinder

Server kodni yangilang

portfinderdan quyidagicha foydalanasiz:

const express = require("express");
const dotenv = require("dotenv");
const portfinder = require("portfinder");

const app = express();
dotenv.config();

// Define a base port to start searching from
portfinder.basePort = process.env.PORT || 3000;

portfinder.getPort((err, port) => {
  if (err) {
    console.error("Error finding available port:", err);
    return;
  }
  app.listen(port, () => {
    console.log(`Server running on port ${port}`);
  });
});

Key Features

Istalgan portdan boshlaydi: portfinder.basePort ni process.env.PORT yoki boshqa fallback portdan boshlash uchun sozlang.
Ish vaqtidagi xatolardan saqlaydi: Agar istalgan port band bo'lsa, avtomatik ravishda bo'sh portni topadi.

🔥 Nima Uchun Bu Muhim

Dasturlash Jarayonini Yaxshilaydi: Portni qo'lda o'zgartirishga vaqt sarflamaysiz.
Ishlab Chiqarishda Ishonchlilikni Ta'minlaydi: Agar defolt port mavjud bo'lmasa ham, serveringiz ishga tushadi.

🌟 Yakuniy Fikrlar

Port muammolari sizning performance'ingizni to'xtatmasligi kerak! 🚀 portfinder yordamida, sizning Node.js serveringiz har doim ishlash uchun portni topadi.

Keyingi loyihangizda buni sinab ko'ring va qanday ishlashini izohlarda bildiring!

💡 Pro Tip: Foydalanuvchilarga qaysi port ishlatilayotganini ko'rsatish uchun do'stona console.log xabarini qo'shing.

console.log(`Server running on: http://localhost:${port}`);

Dynamic Port Handling in Node.js: Never Let Your Server Fail to Start 🚀

Barkamol Valiev — Wed, 01 Jan 2025 06:33:47 +0000

Dynamic Port Handling in Node.js: Never Let Your Server Fail to Start 🚀

Have you ever tried starting your Node.js server, only to get an error saying, "Port is already in use"? 🚖 It's frustrating, but there's a simple solution!

In this post, I’ll show you how to dynamically find an available port using the portfinder package, so your server always runs smoothly.

🛠️ Problem: Port Conflicts

By default, most servers use process.env.PORT or a fallback like 3000. But if that port is already busy, your app will fail to start. Instead, let’s find an available port dynamically.

🗰️ Solution: Using `portfinder`

Install `portfinder`

First, add the portfinder package to your project:

npm install portfinder

Update Your Server Code

Here’s how to integrate portfinder into your server:

const express = require("express");
const dotenv = require("dotenv");
const portfinder = require("portfinder");

const app = express();
dotenv.config();

// Define a base port to start searching from
portfinder.basePort = process.env.PORT || 3000;

portfinder.getPort((err, port) => {
  if (err) {
    console.error("Error finding available port:", err);
    return;
  }
  app.listen(port, () => {
    console.log(`Server running on port ${port}`);
  });
});

Key Features

Starts with your desired port: Set portfinder.basePort to start searching from process.env.PORT or any fallback.
Avoids runtime errors: Automatically finds an available port if the desired one is busy.

🔥 Why This Matters

Improves Development Workflow: You won’t waste time manually changing ports.
Resilience in Production: Ensures your server starts even if the default port is unavailable.

🌟 Final Thoughts

Port conflicts don’t have to stop your productivity! 🚀 Using portfinder, you can ensure your Node.js server always finds a port to run on.

Try this out in your next project, and let me know how it works for you in the comments below! 😄

💡 Pro Tip: Add a friendly console.log message to tell users which port is being used.

console.log(`Server running on: http://localhost:${port}`);

Thanks for reading! Happy coding! 💻✨

JavaScript array metodlari.

Barkamol Valiev — Sat, 07 Dec 2024 14:00:59 +0000

Ko'p gapirmay ishga o'tamiz. Ushbu postda javascript dasturlash tilidagi arraylarning metodlari bilan tanishamiz va unga doir masalalarni ishlaymiz.

Element qo'shish, o'zgartirish.

length()
push()
concat()

O'chirish.

pop()
shift()
splice()
delete array[i]

Qidirish.

find(function())
indexOf()

Tartiblash

sort() sonlar hamda stringlar uchun

Reverse

reverse()

Element qo'shish va o'zgartirish.

lenght metodi arrayning elementlar soni, yoki uzunligni topadi.
Shuni eslatib o'tish lozimki Javascriptda arraylarning turi object hisoblanadi. Agar siz avval c/c++, yoki java kabi tillarni o'rgangan bo'lsangiz bu biroz tushunarsiz tuyulishi mumkin. JavaScriptda arraylarning o'zi aslida data-type hisoblanadi, ya'ni c/c++ dagi arraylardan farqlanadi. JSda siz bir arrayning ichida turli tipdagi ma'lumotlarni saqlashingiz mumkin.

// Arrayning uzunligi, o'lchami
const array = ["nimadir", "kimdir", true, 55, 4.6];
console.log(`arrayning uzunligi ${array.length}`);

Arrayning oxiridan yangi element qo'shish.

Sizda savol tug'ilishi mumkin. constant o'zgaruvchining qiymatini o'zgartirish mumkinmi? Ha push() metodi orqali yangi element kiritmoqdamiz, lekin biz arrayga yangittan qiymat tenglamayappiz.

// push(), array oxiriga yangi element qo'shish
const array = ["nimadir", "kimdir", true, 55, 4.6];
array.push("yangi element");
console.log(`arrayning uzunligi: ${array} \n`);

Ikki arrayni birlashtirish(concatenate).

concat() metodi orqali ikki array birlashtiriladi.

// concat(), ikki arrayni birlashtirish
let array1 = ["nimadir", "kimdir", true, 55, 4.6];
let array2 = [8, 3, 9];
console.log("array1: " + array1, "\n", "array2: " + array2 + "\n");

let result = array1.concat(array2);
console.log(
  `Ikki array bitta yangi arrayga birlashtirildi: result [${result}] \n`
);

Arraydan elementni o'chirish.

JavaScriptda array elementlarini o'chirishning bir necha xil usullari mavjud.
pop() metodi array oxiridan bitta elementni o'chirishda ishlatiladi.

// pop(), arrayning oxiridan bitta element o'chiradi
let array1 = [6, "satr", true, 55, 4.6];
console.log(`\navval:  [${array1}]\n`);

array1.pop();
console.log(`keyin:  [${array1}]\n`);

shift() metodi array boshidan bitta elementni o'chiradi

// shift() Metodi

const array = [44, 5.3, 2, 14, 98, "text", "olma"];
console.log(`\navval: [${array}] \n`);

array.shift();
console.log(`keyin: 44 arrayda emas [${array}]\n`);

splice() metodi o'ziga xos, u faqat elementlarni o'chirish uchun ishlatilmaydi, balki ma'lumotlarni o'zgartirish ham mumkin. O'chirish maqsadida, metod o'ziga ikkita qiymat qabul qiladi.

birinchi: elementlarni o'chirishning boshlanish indexi.
ikkinchi: nechta element o'chirilishi.

Masalan: const array = [44, 5.3, 2, 14, 98, "text", "olma"]; mavjud. Biz 3-index, ya'ni 14 dan boshlab(14 ning o'zi ham o'chadi), 2 ta element o'chirmoqchimiz.

// splice() Metodi

const array = [44, 5.3, 2, 14, 98, "text", "olma"];
console.log(`\navval: [${array}] \n`);

array.splice(3, 2);

console.log(`keyin: 14 va 98 elementlari o'chdi [${array}]\n`);

O'zgartirish(almashtirish) maqsadida splice() quyidagicha ishlatiladi.

boshlanish indeksi array.splice(3, ...)
nechta element almashtirilishi array.splice(3, 2, ...)
mos ravishda kiritilishi kerak bo'lgan yangi elementlar array.splice(3, 2, "yangi1", "yangi2")

// splice() Metodi

const array = [44, 5.3, 2, 14, 98, "text", "olma"];
console.log(`\navval: [${array}] \n`);

array.splice(3, 2, "yangi1", "yangi2");

console.log(`keyin: 14 va 98 elementlari almashtirildi [${array}]\n`);

delete array[i] metodi array elementni o'chirishning eng oson metodi. Bunda [i] o'rniga o'chirilishi kerak bo'lgan elementning indeksi yoziladi.

// delete Metodi

const array = [44, 5.3, 2, 14, 98, "text", "olma"];
console.log(`\navval: [${array}] \n`);

delete array[0];

console.log(`keyin: birinchi element o'chirildi [${array}]\n`);

Arraydan qidirish

find(function()) metodi arraydan berilgan elementni qidirishda ishlatiladi. Bu metodga qiymat sifatida funksiya yoziladi va funksiyaga qidirilayotgan element beriladi. Funksiya indeks qaytarmaydi, agar qidirilayotgan element arrayda mavjud bo'lsa, shu elementni return qiladi, aks holda undefined qaytaradi.

// find(function()) Metodi

const array = [44, 5.3, 2, 14, 98, "text", "olma"];
console.log(`\navval: [${array}] \n`);

// qidirmoqchi bo'lgan element
let element = 14;

let findVal = array.find(function (e) {
  return e === element;
});

console.log(`qidirilgan element: ${findVal}\n`);

//aks holatda
element = 55;

findVal = array.find((e) => {
  return e === element;
});
console.log(`qidirilgan element: ${findVal}\n`);

indexOf() metodi esa qidirilayotgan elementning indeksini qaytaradi.

// indexOf() Metodi

const array = [44, 5.3, 2, 14, 98, "text", "olma"];
console.log(`\navval: [${array}] \n`);

// qidirmoqchi bo'lgan element
let element = 14;

let findVal = array.indexOf(element);
console.log(`qidirilgan element indeksi: [${findVal}]\n`);

Tartiblash

sort() metodi, mana JavaScriptning "boshog'rig'i" shu yerdan boshlanadi. Bir qarashda sort() metodi oddiydek, aslida parda ortida boshqa jarayon ketadi. Defolt holatda sort() stringlarni tartiblaydi, lekin integer yoki numerik qiymat berilsa ham to'g'ri tartiblashi mumkin. Ammo JavaScript sonlarni xohlasa tartiblaydi, hoxlamasa yo'q(hazil albatta):)

// sort() Metodi

const array = ["zebra", "non", "futbol", "osmon", "kerak"];
console.log(`\navval: [${array}] \n`);

let sorted = array.sort();
console.log(`tartiblangan array: [${sorted}]\n`);

numerik qiymatlarda quyidagicha.

// sort() Metodi

const array = [45, 10, 30, 78, 61, 17];
console.log(`\navval: [${array}] \n`);

let sorted = array.sort();

console.log(`tartiblangan array: [${sorted}]\n`);

Xo'sh muammo nimada?

Deyishingiz mumkin, davom etamiz.

// sort() Metodi

const array = [45, 100, 30, 8, 61, 21];
console.log(`\navval: [${array}] \n`);

let sorted = array.sort();

console.log(`tartiblangan array: [${sorted}]\n`);

To'xtang, natijaga qarang, tartiblangan array: [100,1021,30,45,61,8] bu nimasi!?
JavaScript arrayni string sifatida tartiblaydi. Numerik, son berilsa ham uni ascii kodga o'tkazib, leksikografik, ya'ni string kabi tartiblayveradi. Bu esa xatolik keltirib chiqaradi. Masalada 100 eng songida, 30 esa 100dan avval turishi kerak edi. char sifatida 1 3dan avval turadi, shuning uchun xatolik kelib chiqaveradi(ascii jadvalga qarang!). Buni to'g'rilash uchun sort() metodiga function() beramiz.

// sort() Metodi

const array = [45, 100, 30, 8, 61, 21];
console.log(`\navval: [${array}] \n`);

let sorted = array.sort((a, b) => a - b);

console.log(`tartiblangan array: [${sorted}]\n`);

array.sort((a, b) => a - b);funksiyasi massivdagi ikkita elementni solishtiradi va ularning tartibini aniqlaydi.

a va b: Bu massivdan ikki element bo'lib, ular taqqoslanadi. sort() metodi barcha elementlarni juft-juft qilib taqqoslaydi (masalan, a va b) va ularni taqqoslash funksiyasining natijasiga qarab joylashtiradi.

a - b: Bu ayirmalarni hisoblash orqali elementlarning tartibi belgilanadi:

Agar a - b manfiy bo'lsa (ya'ni, a < b), a b dan oldin keladi.
Agar a - b musbat bo'lsa (ya'ni, a > b), b a dan oldin keladi.
Agar a - b nol bo'lsa (ya'ni, a === b), u holda ular o'zaro tartibda o'zgarmaydi.

Natija:

Chappa qilish

reverse() metodi o'z nomi bilan berilgan arrayga teskari array hosil qiladi.

//reverse() Metodi

const array = [45, 100, 30, 8, 61, 1021];
console.log(`\navval: [${array}] \n`);

let reversed = array.reverse();

console.log(`reversed array: [${reversed}]\n`);

Natija:

Umid qilamanki post orqali JavaScript array metodlari bo'yicha bilimga ega bo'ldingiz, ushbu postni JSni o'rganayotgan yaqinlaringizga ulashing!

Takrorlash uchun masalalar:

1. Element qo'shish, o'zgartirish:

a. length()

Problem: Biror katta massivni tasavvur qiling, unda 1000 ta qiymat mavjud. Agar sizga faqat massivdagi elementlar sonini chiqarib berish kerak bo'lsa, qanday metoddan foydalanasiz? Massivda qanday o'zgarishlar bo'lsa ham, elementlar soni qanday o'zgaradi?
Problem: Agar sizga berilgan massivning oxiriga yangi 1000 ta element qo'shish kerak bo'lsa, massiv uzunligini aniqlang. Buning uchun qaysi metoddan foydalanish eng samarali hisoblanadi?

b. push()

Problem: Sizda har bir elementi bir xil bo'lgan massiv mavjud. Har safar yangi element qo'shganda, massivning oxiridagi elementni o'zgartirishingiz kerak. Bu operatsiyalarni qanday optimallashtirasiz?
Problem: Sizda tasks nomli massiv bor, uning ichida turli xil bajarilishi kerak bo'lgan vazifalar mavjud. Har safar yangi vazifa qo'shish va ro'yxatning oxiridagi vazifani yangilash kerak. Buni qanday amalga oshirasiz?

c. concat()

Problem: Ikki massivni birlashtirib, ularni bir xil formatda ko'rsatishingiz kerak. Birinchi massivda faqat oddiy sonlar mavjud, ikkinchisi esa faqat raqamli stringlardan iborat. Qanday qilib ulardan yangi massiv yaratib, barcha sonlarni raqamli formatda chiqarish mumkin?
Problem: Sizda ikkita massiv bor: biri foydalanuvchilar haqida ma'lumotlarni, ikkinchisi esa foydalanuvchilarning kirish tarixini o'z ichiga oladi. Bu massivlarni birlashtirishingiz kerak, ammo faqat foydalanuvchilarning faol holatdagi tarixlarini ko'rsatmoqchisiz. Buni qanday amalga oshirasiz?

2. O'chirish:

a. pop()

Problem: Sizda bir nechta foydalanuvchilar ro'yxati mavjud, va har safar oxirgi foydalanuvchini ro'yxatdan chiqarib yuborishingiz kerak. Ammo faqatgina so'nggi 3 kundagi faol foydalanuvchilarni saqlab qolishni xohlaysiz. Qanday qilib ularni boshqarishingiz mumkin?
Problem: Sizda books nomli massiv bor, unda turli kitoblar haqida ma'lumotlar mavjud. Har safar oxirgi kitobni o'chirib, yangi kitob qo'shishingiz kerak. Buni qanday tartibda amalga oshirasiz?

b. shift()

Problem: Biron bir navbatdagi jarayonni tasavvur qiling, unda foydalanuvchilar navbatni kutishmoqda. Har safar navbatdagi foydalanuvchini tizimdan chiqarib, yangi foydalanuvchini kiritishingiz kerak. Bu jarayonni qanday amalga oshirasiz?
Problem: Sizda foydalanuvchilarning kirish vaqtiga qarab tashkil etilgan massiv bor. Har safar eng birinchi foydalanuvchini ro'yxatdan chiqarib yuborishingiz kerak. Buni qanday amalga oshirasiz?

c. splice()

Problem: Sizda talabalar ro'yxati mavjud va har safar 3 ta talabaning ma'lumotlarini o'zgartirishingiz yoki ularni ro'yxatdan o'chirishingiz kerak. Bu jarayonni qanday tartibda amalga oshirasiz?
Problem: Sizda masalalar ro'yxati mavjud. Har safar bir nechta masalani olib tashlash va o'zgartirish kerak. Masalani o'zgartirishda, boshqa masalalar to'g'ri tartibda qolishi kerak. Buni qanday amalga oshirasiz?

d. delete array[i]

Problem: Sizda katta hajmdagi massiv mavjud, va biror elementni uning indeksiga qarab o'chirishingiz kerak. Elementni o'chirishda massivdagi boshqa elementlar qanday o'zgarishini hisobga olgan holda qanday amallarni bajarish kerak?
Problem: Sizda mijozlar ro'yxati bor va har bir mijozning o'ziga xos ID raqami bor. Berilgan ID bo'yicha mijozni ro'yxatdan o'chirish uchun qanday metoddan foydalanish mumkin?

3. Qidirish:

a. find(function())

Problem: Sizda foydalanuvchilar ro'yxati bor. Har bir foydalanuvchining ID raqami va ismi mavjud. Sizga faqat ismi "John" bo'lgan foydalanuvchining ma'lumotlarini olish kerak. Buni qanday amalga oshirasiz?
Problem: Sizda mahsulotlar ro'yxati mavjud, va har bir mahsulotning nomi va narxi bor. Faqat narxi 100 dan yuqori bo'lgan mahsulotni qidirishingiz kerak. Buni qanday amalga oshirasiz?

b. indexOf()

Problem: Sizda kitoblar ro'yxati mavjud, va har bir kitobning nomi va muallifi bor. Agar foydalanuvchi kitobni qidirsa, uning nomi bo'yicha qaysi indeksda ekanligini aniqlang.
Problem: Sizda maxsulotlar ro'yxati bor va har bir mahsulotga noyob identifikatsiya raqami berilgan. Agar foydalanuvchi maxsulotni qidirsa, uning ID raqamiga qarab uni topishingiz kerak. Bu qanday amalga oshiriladi?

4. Tartiblash:

a. sort()(sonlar uchun)

Problem: Sizda bir nechta o'quvchilarning baholari bor. Baholarni kichikdan kattaga qarab tartiblang, ammo baholar bir xil bo'lgan o'quvchilarni ism bo'yicha tartiblang.
Problem: Sizda mahsulotlarning narxlarini o'z ichiga olgan massiv bor. Siz narxlarni kamayish tartibida tartiblang, ammo narxlar bir xil bo'lsa, ularni sotilish sanasiga qarab tartiblang.

b. sort()(stringlar uchun)

Problem: Sizda mijozlarning ismlaridan iborat massiv mavjud. Ularni alifbo tartibida sortlashingiz kerak, ammo faqat bosh harfga qarab tartiblashtirish kerak.
Problem: Sizda kitoblarning nomlari bor. Siz barcha kitoblarni ulardagi so'zlarning uzunligiga qarab tartiblamoqchisiz. Buni qanday amalga oshirasiz?

5. Chappalash:

a. reverse()

Problem: Sizda bir nechta sonlardan iborat massiv mavjud. Siz bu massivni teskari tartibda chiqarib berishingiz kerak. Buning o'zgarishlarini qanday hisoblash mumkin?
Problem: Sizda matnlar ro'yxati mavjud va siz matnlarni teskari tartibda chiqarishni xohlaysiz. Agar matnlar bir xil uzunlikda bo'lsa, qanday natija olasiz?

xatolar va savollar

Forem: Barkamol Valiev

Managing JWT Logout with Blacklists and Redis: A Beginner-Friendly Guide

Understanding Statelessness and JWT

What is a Blacklist?

Why Redis?

How to Start Without Redis

Getting Started with Redis

1. Install Redis

2. Integrate Redis in Node.js

Redis vs In-Memory

Next Steps

Node backend port band bo'lib qolishi

🛠️ Muammo: Port nomutanosibligi

🗰️ Yechim:portfinder ishlatish

Install portfinder

Server kodni yangilang

Key Features

🔥 Nima Uchun Bu Muhim

🌟 Yakuniy Fikrlar

Dynamic Port Handling in Node.js: Never Let Your Server Fail to Start 🚀

Dynamic Port Handling in Node.js: Never Let Your Server Fail to Start 🚀

🛠️ Problem: Port Conflicts

🗰️ Solution: Using portfinder

Install portfinder

Update Your Server Code

Key Features

🔥 Why This Matters

🌟 Final Thoughts

JavaScript array metodlari.

Ko'p gapirmay ishga o'tamiz. Ushbu postda javascript dasturlash tilidagi arraylarning metodlari bilan tanishamiz va unga doir masalalarni ishlaymiz.

Element qo'shish, o'zgartirish.

O'chirish.

Qidirish.

Tartiblash

Reverse

Element qo'shish va o'zgartirish.

Arrayning oxiridan yangi element qo'shish.

Ikki arrayni birlashtirish(concatenate).

Arraydan elementni o'chirish.

Arraydan qidirish

Tartiblash

Chappa qilish

Umid qilamanki post orqali JavaScript array metodlari bo'yicha bilimga ega bo'ldingiz, ushbu postni JSni o'rganayotgan yaqinlaringizga ulashing!

Takrorlash uchun masalalar:

🗰️ Yechim:`portfinder` ishlatish

Install `portfinder`

🗰️ Solution: Using `portfinder`

Install `portfinder`