Forem: Hamza Khan

NestJS vs. Express: Why Structure Beats Speed in the Long Run 🚀

Hamza Khan — Mon, 18 Aug 2025 08:36:38 +0000

When building backend applications in JavaScript/TypeScript, two names come up repeatedly: Express.js and NestJS.

Express is minimal, flexible, and lightning-fast to get started.
NestJS builds on top of Express (or Fastify) but enforces structure, scalability, and maintainability.

So, which one should you choose for your next project in 2025? Let’s dive deep.

🏗️ Express.js – The Minimalist Approach

Express is essentially unopinionated. You can structure your project however you like. This is amazing for small projects but can get messy as your app grows.

👉 Example: A simple route in Express:

// server.js
const express = require("express");
const app = express();

app.get("/users", (req, res) => {
  res.send("List of users");
});

app.listen(3000, () => {
  console.log("Server running on port 3000");
});

✅ Quick to set up
✅ Minimal boilerplate
❌ No enforced structure (your team decides everything)
❌ Harder to scale in large applications

🏛️ NestJS – The Opinionated Framework

NestJS is built on top of Express (or Fastify) but adds a modular architecture inspired by Angular.

👉 Example: A simple route in NestJS:

// users.controller.ts
import { Controller, Get } from '@nestjs/common';

@Controller('users')
export class UsersController {
  @Get()
  getUsers(): string {
    return 'List of users';
  }
}

// app.module.ts
import { Module } from '@nestjs/common';
import { UsersController } from './users.controller';

@Module({
  controllers: [UsersController],
})
export class AppModule {}

✅ Built-in support for TypeScript
✅ Dependency Injection out of the box
✅ Modular & maintainable architecture
✅ Built-in testing utilities
❌ More boilerplate than Express
❌ Slightly steeper learning curve

⚡ Code Comparison: Express vs NestJS

Let’s compare how both handle a POST /users endpoint.

Express.js

// server.js
const express = require("express");
const app = express();

app.use(express.json());

app.post("/users", (req, res) => {
  const { name, email } = req.body;
  res.json({ message: "User created", user: { name, email } });
});

app.listen(3000, () => {
  console.log("Server running on port 3000");
});

NestJS

// users.controller.ts
import { Controller, Post, Body } from '@nestjs/common';

@Controller('users')
export class UsersController {
  @Post()
  createUser(@Body() userData: { name: string; email: string }) {
    return {
      message: 'User created',
      user: userData,
    };
  }
}

👉 Notice how NestJS enforces structure (Controllers, Modules, Decorators), while Express gives full freedom but at the cost of consistency.

🚀 Why Structure Beats Speed in the Long Run

Small apps → Express shines with quick setup.
Large teams & enterprise apps → NestJS wins because:
- Clear modular structure
- Enforced best practices
- Built-in support for GraphQL, WebSockets, Microservices, Testing, and more
- Long-term maintainability

As projects scale, the cost of lack of structure in Express often outweighs its initial speed advantage.

🔮 Final Thoughts: Which Should You Pick in 2025?

Choose Express if:
- You’re building a small project, prototype, or API with minimal complexity.
Choose NestJS if:
- You’re working with a team.
- You expect your project to scale.
- You want built-in TypeScript, testing, and architectural patterns.

👉 In 2025, NestJS is becoming the go-to choice for enterprise-grade apps, while Express still dominates in lightweight services.

PostgreSQL vs. MongoDB in 2025: Which Database Should Power Your Next Project?

Hamza Khan — Mon, 11 Aug 2025 07:21:58 +0000

The database landscape in 2025 is more competitive than ever. With PostgreSQL evolving into a powerhouse of relational and semi-structured data capabilities, and MongoDB doubling down on distributed performance and developer-friendly workflows, the choice between the two isn’t as straightforward as it used to be.

If you’re building a scalable backend, data-intensive SaaS, or real-time analytics system, understanding their latest capabilities is essential before making the call.

1. PostgreSQL in 2025: A Hybrid Relational Beast

PostgreSQL is no longer “just” a relational database. With features like native JSONB indexing, parallel query execution, and pgvector for AI/ML workloads, it now comfortably handles mixed workloads that used to be MongoDB’s territory.

Key 2025 Advancements:

PgVector 0.7 → Native vector embeddings for semantic search & AI agents.
Improved Logical Replication → Near-zero-downtime scaling for global apps.
JSONB Enhancements → Better indexing strategies for nested documents.
Postgres FDW 2.0 → Query external data sources (like S3 or Kafka) without ETL.

✅ Best for:

Systems with strong consistency needs.
Complex relational queries (e.g., joins, constraints, transactions).
Mixed workloads with relational + JSON data.

2. MongoDB in 2025: The Document-First Distributed Engine

MongoDB remains the king of flexible schemas and horizontal scaling. Its Atlas Vector Search and Queryable Encryption 2.0 in 2025 make it even more appealing for modern AI-powered apps and privacy-first architectures.

Key 2025 Advancements:

Atlas Vector Search 2.1 → AI-native query capabilities built-in.
Queryable Encryption 2.0 → Search over encrypted fields without decryption.
Multi-Region Write Clusters → Lower latency for global apps.
Time-Series Enhancements → Faster aggregations for IoT & analytics.

✅ Best for:

Rapid prototyping with dynamic schemas.
Real-time applications with sharded clusters.
AI-enabled search over large, unstructured datasets.

3. Performance Benchmarks: 2025 Insights

Performance comparisons are workload-specific, but recent 2025 community benchmarks show:

Workload	PostgreSQL	MongoDB
Complex multi-table joins	🏆 Faster	Slower
Full-text search (native)	Comparable	Comparable
Vector search (AI queries)	Good (pgvector)	🏆 Faster
Massive write-heavy workloads	Slower	🏆 Faster
Strong ACID transactions	🏆 Stronger	Weaker

4. Decision Framework: How to Choose in 2025

When deciding between PostgreSQL and MongoDB in 2025, consider three dimensions:

Data Structure

Highly relational? → PostgreSQL
Flexible & evolving schema? → MongoDB

Performance Priorities

Read-heavy analytics? → PostgreSQL (parallel queries, indexing).
Write-heavy, geo-distributed apps? → MongoDB (sharding, multi-write).

Future Workload Expansion

AI-first features needed? → MongoDB Atlas Vector Search.
Mixed relational + document workloads? → PostgreSQL JSONB.

5. The Hybrid Approach

In 2025, many enterprise systems run both:

PostgreSQL for core transactional logic.
MongoDB for user-facing, flexible document storage.

Using change data capture (CDC) via tools like Debezium or Kafka Connect, you can sync data between the two, leveraging each for what it does best.

Final Thoughts

The debate isn’t about PostgreSQL vs. MongoDB as much as it’s about choosing the right tool for the right problem. In 2025, PostgreSQL has narrowed the gap on flexibility, while MongoDB has caught up on transactional integrity — meaning your decision should hinge on specific workload patterns, scalability goals, and team expertise.

💬 What’s your take for 2025? Are you team PostgreSQL, MongoDB, or hybrid? Let’s discuss in the comments.

💡 Mastering SQL Query Optimization: Tips Every Backend Developer Should Know

Hamza Khan — Sun, 13 Jul 2025 16:13:47 +0000

In modern web applications, database performance can make or break your app's scalability. Whether you're working with PostgreSQL, MySQL, or another relational DBMS, understanding how to optimize SQL queries is an essential skill for any backend developer.

This post dives into practical, real-world tips that will help you write faster, leaner, and more maintainable SQL — with examples and explanations. Let's unlock those performance wins! 🚀

📌 1. Always Use Indexes (Wisely)

Indexes are the cornerstone of query optimization — but they’re not magic.

✅ DO:

Index frequently queried columns (especially in WHERE, JOIN, or ORDER BY).
Use composite indexes if querying multiple columns together.

⚠️ DON’T:

Index everything — each index has a write performance and storage cost.

-- Add index on email column for faster lookups
CREATE INDEX idx_users_email ON users(email);

🔍 Use EXPLAIN or EXPLAIN ANALYZE to check whether your query uses an index.

⏳ 2. Limit Data Early

Fetching large amounts of unnecessary data leads to slower performance and wasted bandwidth.

-- Instead of this
SELECT * FROM orders;

-- Do this
SELECT id, status, created_at FROM orders WHERE user_id = 101 LIMIT 100;

💡 Tip: Only SELECT the columns you need.

🔄 3. Use JOINs Instead of Multiple Queries

Using JOINs is usually more efficient than making multiple roundtrips to the database.

-- Good example of an INNER JOIN
SELECT u.name, o.total
FROM users u
JOIN orders o ON u.id = o.user_id
WHERE u.id = 123;

🧠 Bonus: Always use explicit JOINs (not implicit WHERE joins) for better clarity and performance.

🧮 4. Avoid SELECT * (Seriously!)

Fetching all columns can bloat result sets, affect cache usage, and make indexing less effective.

-- Bad
SELECT * FROM products;

-- Good
SELECT name, price FROM products WHERE category = 'laptop';

🎯 Only pull the data you need. This also reduces frontend parsing load.

📈 5. Analyze and Optimize Execution Plans

Use tools like EXPLAIN, EXPLAIN ANALYZE, or your database’s visual query analyzer to identify:

Full table scans
Sequential reads
Index usage
Join algorithms

EXPLAIN ANALYZE
SELECT * FROM users WHERE email = 'test@example.com';

⚒️ Tool Tips:

PostgreSQL: pgAdmin, EXPLAIN ANALYZE
MySQL: SHOW PROFILE, EXPLAIN FORMAT=JSON

🔁 6. Watch for N+1 Query Problems

Common in ORMs like Sequelize, Prisma, TypeORM, etc. When fetching relations in loops, you may accidentally make dozens of queries.

// BAD: N+1 problem
const users = await db.users.findMany();
for (const user of users) {
  const posts = await db.posts.findMany({ where: { userId: user.id } });
}

🔥 Use eager loading or batch queries:

// BETTER: Eager load posts
const users = await db.users.findMany({
  include: { posts: true }
});

🧠 7. Use Aggregations Wisely

Use COUNT(), SUM(), AVG() only when necessary — and make sure they're optimized.

-- Count indexed column for better performance
SELECT COUNT(id) FROM users WHERE status = 'active';

⚠️ COUNT(*) on unindexed large tables = 🚨 performance hit.

🧰 8. Use Caching When Needed

If you're repeating the same expensive query across users or sessions, cache it.

Use Redis, Memcached, or even materialized views (e.g., in PostgreSQL).
Avoid querying on every API call if the data doesn’t change often.

📊 9. Monitor & Benchmark Regularly

Use logs, metrics, and query analyzers:

PostgreSQL: pg_stat_statements
MySQL: slow_query_log
ORMs: Enable query logging for insight

🚀 Final Thoughts

Optimizing SQL queries is about small, consistent wins that add up over time. By using indexes properly, limiting what you fetch, understanding your joins, and watching for N+1s, you'll build backend systems that scale more reliably and save real cloud dollars.

💬 What’s your favorite SQL optimization tip? Or the biggest mistake you once made?

⚔️ Node.js vs Bun vs Deno: Who Rules the Server in 2025? 🚀

Hamza Khan — Mon, 07 Jul 2025 08:41:49 +0000

In the world of JavaScript runtimes, Node.js has been the dominant force for over a decade. But with the rise of Deno and Bun, the server-side landscape is undergoing a massive shift. These newer runtimes are making bold promises: faster execution, better tooling, enhanced security, and modern module support.

So… which runtime actually leads in 2025? Let’s break it down with a technical deep dive. 🧠

📦 TL;DR Comparison

Feature	Node.js	Deno	Bun
Language Support	JavaScript, TypeScript (via transpiler)	TypeScript (native)	JavaScript, TypeScript
Package Manager	npm	Built-in (no `node_modules`)	Bun’s built-in (super fast)
Speed (Startup/Runtime)	⚠️ Slower (traditional)	⚡ Faster	⚡⚡ Blazing Fast (written in Zig)
ESM Support	Partial	Full (native)	Full (fast)
Security	Low (unrestricted)	✅ Secure by default	Moderate
Built-in APIs	Minimal	Batteries-included	Many (fetch, WebSocket, etc.)
Community + Ecosystem	Huge	Growing	Rapidly growing

🧪 Benchmark Snapshot (2025)

Let’s take a basic HTTP server and benchmark it.

Node.js

const http = require('http');
http.createServer((_, res) => {
  res.end('Hello from Node');
}).listen(3000);

Deno

Deno.serve(() => new Response("Hello from Deno"));

Bun

Bun.serve({
  fetch(req) {
    return new Response("Hello from Bun");
  },
});

Results (Requests/sec on M2 chip)

Runtime	Requests/sec
Node.js	~25,000
Deno	~40,000
Bun	~70,000+

🔍 Bun wins in raw speed, but Deno is close behind and offers more security. Node.js lags, but benefits from unmatched ecosystem maturity.

🌍 Ecosystem Maturity

Node.js: Mature tooling (npm, ts-node, jest), massive community, legacy project support.
Deno: Uses web-standard APIs (fetch, Request, Response), still limited third-party modules.
Bun: Fast test runner, bundler, transpiler, but evolving community.

👀 Question: Is ecosystem size more important than performance for your next project?

🔐 Security Considerations

Node.js: No security sandbox. Scripts can access anything on the machine.
Deno: Secure by default (--allow-read, --allow-net required).
Bun: No permission system yet, similar to Node.

🛡️ If you’re building for enterprises or edge deployments, Deno’s sandbox model is a huge plus.

🚀 Use Case Recommendations

Use Case	Recommended Runtime
Legacy applications	Node.js
Fast greenfield API	Bun
Secure CLI tools	Deno
Edge deployments (Cloudflare)	Deno or Bun
Build tools & test runners	Bun

🔮 The Future in 2025

Node.js continues to evolve but carries legacy weight (CommonJS, older APIs).
Deno is building momentum in the secure-by-default, standard-based ecosystem.
Bun is capturing attention with unmatched speed and "all-in-one" developer experience.

💡 Many devs are now using Bun for testing + dev and Node or Deno for deployment, blending the strengths.

🧠 Final Thoughts

All three runtimes are fantastic — but your use case defines the winner.

✅ Choose Node.js for battle-tested reliability.
✅ Choose Deno for modern, secure, and standards-compliant apps.
✅ Choose Bun for raw speed, integrated tooling, and bleeding-edge projects.

👋 Have you started migrating from Node to Bun or Deno? Let me know what made you switch — or stick!

⚔️ Next.js vs Qwik: Who Wins the Performance Race in 2025? 🚀

Hamza Khan — Wed, 02 Jul 2025 11:14:25 +0000

In 2025, performance is no longer a luxury — it's a requirement. Whether you're building complex enterprise apps or lightweight landing pages, your framework's ability to render, hydrate, and interact quickly has never mattered more.

Two names stand out in the frontend performance debate today: Next.js, the full-stack React framework that’s evolved with features like Server Actions and React Server Components, and Qwik, a rising star built for instant loading via resumability.

So, who truly wins the performance race in 2025? Let’s dive deep. 🧠

⚡ TL;DR: Quick Comparison

Feature	Next.js 14+ (React 19)	Qwik (Builder.io)
Rendering Model	SSR, ISR, React Server Components	Resumability + SSR + Partial Hydration
Hydration	Client-side & partial (RSCs)	No hydration — resumes from server
Initial Load Time	~200–400ms typical	~<100ms for basic apps
DX Ecosystem	Mature, huge plugin/library support	Growing, unique mental model
Hosting	Works best with Vercel/Edge	Edge-native (Cloudflare, Netlify etc.)
Dev Maturity	Enterprise production ready	Stable but still maturing

🏎️ Hydration: The Real Race

The most performance-critical part of any web app today is how quickly it becomes interactive after loading.

Next.js (with React)

React Server Components reduce hydration needs by streaming static content.
Still, interactivity requires hydration of client-side JavaScript.
Can lead to higher TTI (Time to Interactive) on slow devices or large apps.

Qwik

Introduces resumability, skipping hydration entirely.
Components are resumed — not re-executed — using serialized state from the server.
This means near-instant interactivity with almost no JS execution on page load.

🧠 Question: What if you could load a React-like app with almost zero JavaScript on the client and still keep full interactivity? That’s Qwik’s promise.

🧪 Benchmark Snapshot (2025)

Metric	Next.js (RSC + SSR)	Qwik
TTI (simple blog page)	~350ms	~90ms
Bundle Size (minified)	~180kb	~50kb
Interaction Latency (avg)	~110ms	~40ms

Note: Real benchmarks vary by implementation. But Qwik almost always wins cold-load time.

📦 Dev Experience

Next.js

Familiar React syntax and ecosystem.
Integrated routing, SSR, image optimization, App Router.
Ideal for full-stack development (API routes, Server Actions, etc.).
Extensive Vercel integration and edge support.

Qwik

JSX + Qwik-specific syntax (useTask$, useSignal, etc.).
Built for performance from the ground up — but with a unique learning curve.
Growing ecosystem with Qwik City (routing), Qwikify (for React interop), and QwikDevTools.

🔧 Use Case Comparison

Use Case	Recommendation
Enterprise app with auth, DB, APIs	✅ Next.js
Ultra-fast marketing pages	✅ Qwik
Developer hiring ecosystem	✅ Next.js (React Devs)
Lighthouse-driven client project	✅ Qwik
SSR with CMS (e.g., Sanity, Strapi)	✅ Next.js

🧠 Final Thoughts

Next.js continues to be the go-to for robust React-based full-stack apps with server-side rendering and evolving performance improvements. Qwik, however, is challenging the norm by flipping the hydration model on its head with resumability — and it’s not just hype.

Both are great — but with different philosophies:

Next.js: Optimize the traditional model of hydration and rendering.
Qwik: Eliminate hydration completely.

Will Qwik become the new standard? Or will React’s evolving ecosystem retain dominance through RSCs and the React Compiler?

👉 Let me know which side you’re on, and what framework you’re betting on in 2025!

⚛️ React 19 & Beyond: What’s New and What’s Next in 2025 🚀

Hamza Khan — Mon, 23 Jun 2025 05:31:55 +0000

React 19 is officially here — and it’s more than just another update. It represents a thoughtful evolution of the React ecosystem, focused on performance, simplicity, and reducing boilerplate. Whether you're building enterprise dashboards or small SPAs, understanding what's new in React 19 will help you make the most of your development process in 2025.

Let’s break down the major changes, what they mean for you, and where React is heading.

🧠 Key Highlights in React 19

✅ 1. Actions API (Server Actions)

React 19 introduces Server Actions, designed to replace the traditional use of REST/GraphQL APIs for many use cases in apps using frameworks like Next.js and Remix.

// app/actions.ts
'use server'

export async function addTodo(formData: FormData) {
  const todo = formData.get('todo');
  await db.todos.create({ content: todo });
}

Why it matters:

No need to write separate API endpoints.
Functions run on the server and can be invoked from the client.
You get progressive enhancement for free (with support for <form> and <button>).

🔁 2. Use Hook Outside Components

React 19 brings the ability to use hooks outside of component render functions, in specific cases like useFormStatus, useFormState, and server actions. This reduces boilerplate and improves DX.

const [state, formAction] = useFormState(addTodo, initialState);

⚡ 3. React Compiler (Still Experimental)

While not officially released with 19, the React Compiler is under heavy development. Its purpose? Automatically optimize hooks and eliminate unnecessary re-renders.

What to expect:

No need for useMemo, useCallback, or memo in many cases.
Compiler handles dependency tracking internally.

🎯 4. Improved Form Handling

React 19 introduces better support for native form elements, reducing the need for external libraries like Formik or React Hook Form.

Support for progressive enhancement
Seamless integration with Server Actions
Simpler client/server code unification

🎨 5. Improved Suspense and Streaming Support

React 19 enhances streaming capabilities — especially for React Server Components (RSC) in frameworks like Next.js.

Better handling of nested suspense boundaries
More reliable streaming during SSR
Faster TTFB (Time to First Byte)

🛣️ The Road Ahead for React

React’s roadmap is focused on:

Simplifying full-stack development (via Server Actions)
Compiler-based optimizations
Improved DX (less boilerplate, more declarative patterns)
Framework synergy (tight integration with Next.js, Remix)

Expect even tighter coupling with:

React Server Components
Streaming and async boundaries
Edge-first development models

🔍 TL;DR – Why React 19 Matters

Feature	Benefit
Server Actions	No need to write APIs for many tasks
useFormState/useFormStatus	Better form handling UX
Compiler (upcoming)	No more useMemo/useCallback everywhere
Improved Suspense	Faster, more reliable server streaming
Hooks simplification	Cleaner, more intuitive code

🗣️ Your Turn

Are you already using React 19 features in your stack? What are your thoughts on Server Actions and the upcoming Compiler?

🧩 Event-Driven Architecture in JavaScript Applications: A 2025 Deep Dive

Hamza Khan — Wed, 11 Jun 2025 05:31:42 +0000

In a world of complex frontends, microservices, and reactive systems, Event-Driven Architecture (EDA) is emerging as a powerful paradigm for building scalable, loosely coupled, and highly responsive JavaScript applications. Whether you're working with Node.js backends or frontend state management, embracing events can bring structure and predictability to your codebase.

Let’s explore how EDA works, when to use it, and how to implement it effectively in modern JavaScript.

🚦 What Is Event-Driven Architecture?

Event-Driven Architecture is a design pattern where the flow of the application is determined by events—messages that indicate something has happened. Components emit events and other components listen for them, responding accordingly.

This promotes loose coupling, asynchronous communication, and separation of concerns.

📌 Core Concepts:

Event Emitters – Producers of events.
Event Listeners – Consumers that react to specific events.
Event Bus – A centralized system that manages events across components (optional but common).
Events – Payloads describing "what happened" (e.g., userLoggedIn, fileUploaded, orderPlaced).

💻 EDA in Node.js

Node.js is built around EDA—its core EventEmitter module lets you register and trigger custom events.

const EventEmitter = require('events');
const emitter = new EventEmitter();

emitter.on('userRegistered', (user) => {
  console.log(`Welcome email sent to ${user.email}`);
});

emitter.emit('userRegistered', { email: 'user@example.com' });

✅ Why It Works:

Decouples services (e.g., email sending from user registration).
Enables asynchronous workflows.
Scales well with microservices using message queues like RabbitMQ, Kafka, or Redis Pub/Sub.

⚛️ EDA in Frontend JavaScript

Even in the browser, EDA is powerful for component communication, especially in frameworks like React, Vue, or Svelte.

🔄 Event Bus with Vanilla JS

const EventBus = {
  events: {},
  emit(event, data) {
    (this.events[event] || []).forEach(fn => fn(data));
  },
  on(event, fn) {
    if (!this.events[event]) this.events[event] = [];
    this.events[event].push(fn);
  },
};

EventBus.on('themeChanged', (theme) => {
  console.log(`Switching to ${theme} theme`);
});

EventBus.emit('themeChanged', 'dark');

💡 Use Cases:

Component-to-component communication in non-parent/child relationships.
Custom pub/sub systems in SPAs.
Decoupled UI state updates (like toasts or modals).

📡 Event-Driven State Management

Modern state managers like Redux Toolkit, Recoil, Zustand, and XState incorporate event-driven models.

Example with XState:

import { createMachine, interpret } from 'xstate';

const toggleMachine = createMachine({
  id: 'toggle',
  initial: 'inactive',
  states: {
    inactive: { on: { TOGGLE: 'active' } },
    active: { on: { TOGGLE: 'inactive' } }
  }
});

const service = interpret(toggleMachine).start();

service.onTransition(state => {
  console.log(`Current state: ${state.value}`);
});

service.send('TOGGLE'); // Output: Current state: active

State transitions are triggered via events, not direct mutation—this makes systems more predictable.

🛠️ Building Event-Driven Systems in JavaScript (Best Practices)

Use naming conventions for events (e.g., user:created, email:sent) to avoid ambiguity.
Avoid tight coupling—listeners shouldn't assume too much about event payloads.
Centralize your event bus if using in large SPAs.
Add error handling for unhandled events and listener failures.
Document your events like you would APIs.

🏗️ Real-World Examples

E-commerce: orderPlaced event triggers payment processing, stock update, and email.
Chat apps: messageReceived updates UI, notifies user, and logs message.
Analytics: pageViewed events track user navigation for dashboards.

🧠 When NOT to Use EDA

While powerful, EDA can add complexity. Avoid it if:

You're building a small, simple app.
You don't need async or decoupled flows.
Debugging event chains outweighs the benefits.

📌 Final Thoughts

Event-Driven Architecture isn’t new—but in 2025, with increasing frontend complexity and distributed systems, it's becoming essential. JavaScript’s asynchronous nature makes it a natural fit.

Mastering EDA can transform the way you design your apps—from brittle spaghetti code to reactive, maintainable systems.

🙋‍♂️ Are you using event-driven patterns in your projects? Share your favorite use case or lessons learned below!

🔍 Everything You Need to Know About `this` in JavaScript (2025 Edition)

Hamza Khan — Tue, 03 Jun 2025 05:44:13 +0000

"this is not what you think it is... until it is." — Every JS Developer Ever

JavaScript’s this keyword is one of the most misunderstood and debated features of the language. It's dynamic, context-sensitive, and changes depending on how a function is called—not where it's defined.

In this article, we’ll break down this from fundamental to advanced use cases. Whether you're debugging a callback, building a class, or optimizing performance, understanding this can drastically improve how you write JavaScript.

🚀 What is `this`?

In JavaScript, this refers to the execution context of a function. It determines what object is "speaking" during that call.

But unlike many languages where this is statically bound, JavaScript’s this is dynamically scoped, which means it can vary based on how a function is invoked.

📌 Rule 1: Global Context

In the global scope, this refers to:

window in the browser
global in Node.js (non-strict mode)

console.log(this); // browser: Window, node: global

However, in strict mode ('use strict'), this is undefined in the global scope.

'use strict';
console.log(this); // undefined

📌 Rule 2: Object Method Context

When a function is called as a method of an object, this refers to that object.

const user = {
  name: "Alice",
  greet() {
    console.log(`Hello, I am ${this.name}`);
  },
};

user.greet(); // "Hello, I am Alice"

📌 Rule 3: Standalone Function Context

When a function is called without an object, this refers to the global object in non-strict mode, and undefined in strict mode.

function standalone() {
  console.log(this);
}

standalone(); // non-strict: global; strict: undefined

📌 Rule 4: Constructor Functions and Classes

When using new, this refers to the newly created object.

function Person(name) {
  this.name = name;
}

const p = new Person("Bob");
console.log(p.name); // Bob

In ES6 classes:

class Car {
  constructor(model) {
    this.model = model;
  }

  showModel() {
    console.log(this.model);
  }
}

const c = new Car("Tesla");
c.showModel(); // Tesla

📌 Rule 5: Arrow Functions (Lexical `this`)

Arrow functions don’t have their own this. Instead, they lexically bind to the enclosing scope’s this.

const obj = {
  count: 0,
  increment: function () {
    const arrow = () => {
      this.count++;
    };
    arrow();
  },
};

obj.increment();
console.log(obj.count); // 1

This is super helpful when dealing with methods inside callbacks.

📌 Rule 6: `call`, `apply`, and `bind`

These methods let you explicitly set the value of this.

function greet() {
  console.log(`Hello, ${this.name}`);
}

const user = { name: "Charlie" };

greet.call(user);  // Hello, Charlie
greet.apply(user); // Hello, Charlie

const bound = greet.bind(user);
bound(); // Hello, Charlie

📌 Rule 7: Event Handlers

In browser event handlers, this refers to the DOM element that fired the event.

document.getElementById("btn").addEventListener("click", function () {
  console.log(this); // <button id="btn">...</button>
});

But with arrow functions:

document.getElementById("btn").addEventListener("click", () => {
  console.log(this); // Lexical: likely `window` or enclosing scope
});

Use regular functions when this should refer to the DOM element.

🧠 Common Gotchas

Losing this in Callbacks:

   const obj = {
     name: "Jane",
     greet() {
       setTimeout(function () {
         console.log(this.name); // undefined
       }, 1000);
     }
   };

✅ Fix with arrow function:

   setTimeout(() => {
     console.log(this.name); // Jane
   }, 1000);

Binding in Loops: Don’t forget to bind this in iterative or recursive functions when needed.

🔍 Deep Dive: `this` in ES Modules

In ES modules (.mjs), this at the top level is undefined by design.

console.log(this); // undefined in strict mode modules

✨ Summary Table

Invocation Type	Value of `this`
Global (non-strict)	`window` / `global`
Global (strict)	`undefined`
Object method	The object
Standalone function	`undefined` (strict)
Constructor (`new`)	New instance
Arrow function	Lexical scope
Event listener (DOM)	Event target
`call`, `apply`, `bind`	Explicitly defined

💬 Final Thoughts

Understanding this is essential for mastering JavaScript in 2025. With the shift towards more declarative code, TypeScript, and functional patterns, this may seem like a relic—but it’s still heavily used across frameworks, libraries, and core JS behaviors.

If you're building libraries, working with classes, or handling complex callbacks—mastering this will set you apart.

🗨️ What are your biggest `this`-related bugs or insights? Drop them in the comments!

⚔️ Vite vs. Turbopack in 2025: Which One to Choose?

Hamza Khan — Fri, 30 May 2025 07:51:53 +0000

In the fast-paced ecosystem of JavaScript tooling, build performance and DX (developer experience) are at the heart of modern front-end development. As we move through 2025, two tools continue to dominate the conversation for blazing-fast dev servers and optimized production builds: Vite and Turbopack.

But which one should you use for your next project?

Let’s break it down.

⚡ The Origins: Vite and Turbopack

Vite (pronounced veet) was created by Evan You (Vue's creator) and launched in 2020. It uses native ES modules in the browser and esbuild for lightning-fast dev servers and Rollup for optimized production builds.
Turbopack was announced by Vercel in late 2022 as the spiritual successor to Webpack. Built in Rust, it promised to be 10x faster than Webpack and 5x faster than Vite (in dev mode). It powers Next.js 14+ by default in 2025.

🧪 Benchmark Comparison (2025)

Feature	Vite (v5+)	Turbopack (Latest)
Language	JavaScript / TypeScript	Rust
Dev Server Start Time	~200ms (small app)	~40ms (Next.js w/ Turbopack)
Hot Module Reloading	Near-instant, highly reliable	Ultra-fast, but more memory-heavy
Production Bundler	Rollup	Turbopack-native (Rust-powered)
Framework Support	Vue, React, Svelte, etc.	Optimized for Next.js (React)
Plugin Ecosystem	Large, mature	Still maturing
DX Stability	Battle-tested	Improving, still evolving

🛠️ Use Cases

✅ Use Vite if:

You’re building framework-agnostic apps (e.g., Vue, Preact, Svelte, React).
You want simpler config, faster scaffolding, and a thriving plugin ecosystem.
You’re building libraries or tools that require ESM-first workflows.
You prefer Rollup-style bundling for production.

✅ Use Turbopack if:

You’re working with Next.js 14+ and want deep integration with Vercel’s edge infrastructure.
You need massive app scalability (monorepos, enterprise-scale SSR).
You want parallelized, Rust-powered builds.
You’re okay being on the bleeding edge.

🤯 Developer Experience in 2025

Both tools now support:

Incremental builds
Code splitting
Intelligent caching
Module preloading

But Vite’s ecosystem still leads in community support, while Turbopack leads in raw performance—particularly for large Next.js apps.

🔮 Final Verdict: Which One to Choose?

Use Case	Recommendation
Small to medium projects	Vite
Frameworks other than React	Vite
Large Next.js applications	Turbopack
Maximum performance on Vercel	Turbopack
Custom libraries or tools	Vite
You want stability over bleeding edge	Vite

✅ TL;DR:
Use Vite for general purpose front-end apps.
Use Turbopack if you're deeply invested in the Next.js/Vercel ecosystem and building at scale.

💬 What Are You Using in 2025?

Are you building with Vite or Turbopack this year? Have you switched from Webpack or something else? Let’s talk performance, DX, and bundler wars in the comments!

🚀 Reducing JavaScript Bundle Size with Code Splitting in 2025

Hamza Khan — Sun, 25 May 2025 10:59:31 +0000

JavaScript bundle size is one of the leading factors affecting web performance. A large bundle can delay initial load times, frustrate users, and hurt Core Web Vitals. In 2025, as web apps grow in complexity, code splitting remains a vital optimization strategy.

In this post, we’ll explore code splitting, why it matters, and how to implement it using modern tools like React, Vite, Next.js, and dynamic import().

🔍 Why Bundle Size Matters

Before diving into techniques, let's clarify why reducing your JavaScript bundle size is so important:

⌛ Improved Time-to-Interactive (TTI)
📉 Lower First Input Delay (FID)
📡 Reduced bandwidth usage on mobile/slow networks
🔄 Faster reloads for SPAs and PWAs

🧠 What is Code Splitting?

Code splitting breaks a large bundle into smaller chunks, so users only download the code they need for the current page or feature.

This is especially important in Single Page Applications (SPAs), where loading everything up front can be wasteful.

⚙️ Code Splitting with Dynamic `import()`

JavaScript's import() function enables on-demand loading of modules. Here’s how you can use it in any modern bundler (Webpack, Vite, etc.):

Example:

// Without code splitting
import Chart from './components/HeavyChart';

// With code splitting
const Chart = React.lazy(() => import('./components/HeavyChart'));

import { Suspense } from 'react';

function Dashboard() {
  return (
    <Suspense fallback={<div>Loading chart...</div>}>
      <Chart />
    </Suspense>
  );
}

✅ Result: HeavyChart is only loaded when the Dashboard is mounted.

⚛️ Code Splitting in React (2025)

React 18+ supports lazy loading and Suspense. Here’s how to split routes or components:

const UserProfile = React.lazy(() => import('./UserProfile'));

<Suspense fallback={<Spinner />}>
  <UserProfile />
</Suspense>

For routing:

const AdminPage = lazy(() => import('./pages/Admin'));

<Route path="/admin" element={
  <Suspense fallback={<Loading />}>
    <AdminPage />
  </Suspense>
} />

🌐 Code Splitting with Next.js (SSR + ISR)

In Next.js, code splitting is automatic on a per-page basis. But you can also optimize dynamic components:

import dynamic from 'next/dynamic';

const HeavyWidget = dynamic(() => import('../components/HeavyWidget'), {
  loading: () => <p>Loading...</p>,
  ssr: false, // optional
});

⚡ Vite and Code Splitting

Vite uses Rollup under the hood and performs automatic code splitting for dynamic imports:

// Automatically creates a chunk
const Sidebar = () => import('./components/Sidebar');

Vite will split this out as a separate chunk only when needed.

🧩 Advanced: Vendor Splitting & Prefetching

For larger apps, you can fine-tune your split logic:

💼 Vendor Splitting

Separate vendor dependencies (e.g., React, Lodash) into their own bundle for better caching.

🔮 Prefetching & Preloading

You can hint at future components:

<link rel="prefetch" href="/static/js/chart.chunk.js" />

Or in Webpack:

import(/* webpackPrefetch: true */ './HeavyComponent');

📊 Monitoring Bundle Size

Use tools like:

Example:

npx source-map-explorer dist/bundle.js

🧪 Best Practices for Code Splitting in 2025

✅ Lazy load non-critical components
✅ Split routes at page level
✅ Group rarely used admin/tools into separate chunks
✅ Use dynamic imports instead of conditional rendering
✅ Monitor and adjust with bundle analysis tools

✅ Final Thoughts

Reducing your JavaScript bundle size isn't just a performance trick — it's a UX requirement in 2025. With code splitting, you deliver faster, leaner, and more focused JavaScript to users.

Whether you’re using React, Vue, Svelte, or Next.js, dynamic import() and modern bundlers make it easier than ever to implement.

📦 npm vs Yarn vs pnpm – Which Package Manager Should You Use in 2025?

Hamza Khan — Fri, 09 May 2025 15:39:28 +0000

JavaScript developers in 2025 have three major choices for package management: npm, Yarn, and pnpm. While they all do the job of installing packages, each has distinct performance characteristics, disk usage models, and developer experiences.

In this post, we’ll compare all three based on:

⚡ Speed & Performance
🧠 Dependency Management
📂 Disk Space Efficiency
📦 Workspaces & Monorepo Support
🔧 Developer Experience
🚀 Best Use Cases

⚡ 1. Speed & Performance

Package Manager	Cold Install	Reinstall (Cache)	Benchmark Notes
npm 10+	Moderate	Faster than before	Still improves
Yarn (Berry)	Fast	Very Fast	Uses Zero-Installs
pnpm	Blazing 🚀	Fastest	Hard links & content-addressable store

✅ Winner: pnpm
Its performance is unmatched due to hard links and an optimized caching mechanism.

🧠 2. Dependency Management Accuracy

npm and Yarn use traditional node_modules layouts.
pnpm uses a strict node_modules structure to avoid phantom dependencies.

This means that pnpm fails faster if your package.json is incorrect, preventing bugs from silent dependency leaks.

✅ Winner: pnpm

📂 3. Disk Space & Deduplication

npm stores full copies per project.
Yarn caches efficiently, especially with Plug’n’Play (PnP).
pnpm links packages using symlinks, saving GBs of space across projects.

✅ Winner: pnpm
It’s ideal for developers juggling many repos or monorepos on the same machine.

📦 4. Workspaces & Monorepo Support

npm supports Workspaces, but lacks deep tooling.
Yarn Workspaces are mature and widely adopted.
pnpm shines in monorepo tooling, offering built-in support, filtering, and scoped commands.

✅ Winner: pnpm, with Yarn as a close second.

🔧 5. Developer Experience & Ecosystem

Feature	npm	Yarn	pnpm
CLI Simplicity	✅ Easy	🟡 Complex (Berry)	✅ Familiar
Lockfile Clarity	✅ JSON	🟡 YAML	✅ YAML
Plug’n’Play Support	❌	✅ Yes	🟡 Experimental
Community/Docs	✅ Strong	✅ Active	✅ Growing Fast

✅ Winner: Depends on the team

npm is perfect for simplicity and default Node.js support.
Yarn Berry is powerful but has a steeper learning curve.
pnpm has a clean, fast CLI with modern features.

🚀 Final Verdict: Which One Should You Choose?

Use Case	Recommendation
Beginners & Simple Projects	npm
Enterprise Monorepos	pnpm ✅
Plug’n’Play (no node_modules)	Yarn Berry
Speed, Efficiency, Reliability	pnpm

🏆 My Pick in 2025: `pnpm`

Fast, strict, and reliable — it’s built for modern workflows.

🧠 JavaScript Framework Showdown: React vs. Vue vs. SolidJS in 2025

Hamza Khan — Sat, 03 May 2025 19:22:43 +0000

In 2025, the JavaScript ecosystem continues to evolve rapidly, but three contenders consistently stand out in front-end development: React, Vue, and SolidJS. While each of these frameworks has a strong community and robust tooling, they take very different approaches under the hood.

In this showdown, we'll compare them across five core areas:

Performance
Developer Experience
Reactivity Model
Ecosystem & Tooling
Use Cases

🚀 1. Performance (Hydration, Rendering & Reconciliation)

Framework	Hydration Speed	Runtime Overhead	Benchmark Score (JS Framework Benchmark)
React 19 (w/ Compiler)	Improved, still VDOM based	Medium	52K ops/sec
Vue 4 (Reactivity Transform)	Fast, but VDOM	Low-Medium	61K ops/sec
SolidJS 1.7+	Near-native	Ultra-low	118K ops/sec

✅ Winner: SolidJS

SolidJS’s fine-grained reactivity and compiled output make it blazing fast. It avoids the virtual DOM altogether, which pays off in hydration and CPU-bound rendering.

🛠️ 2. Developer Experience

React now supports React Compiler, simplifying useMemo/ useCallback boilerplate.
Vue offers the Composition API, still regarded as highly intuitive for newcomers.
SolidJS borrows heavily from React’s DX but removes complexity around hooks.

// SolidJS - No hooks, just reactive primitives
const count = createSignal(0);
const double = () => count() * 2;

✅ Tie — React wins for large team support and devtools, Vue wins for simplicity, Solid wins for logic clarity.

⚙️ 3. Reactivity Model

Feature	React	Vue	SolidJS
Virtual DOM	Yes	Yes	❌
Signals	Coming Soon	Supported	✅
Reactive Primitives	useState, useMemo	ref, reactive	createSignal, createEffect

React and Vue are adding Signal-based models, but SolidJS is already there. Its reactivity works like an automatic spreadsheet, where updates flow without overhead.

✅ Winner: SolidJS

📦 4. Ecosystem & Tooling

React dominates in libraries, job market, SSR tools (Next.js), and UI components.
Vue has Nuxt 4, Pinia, Vite integration, and growing TypeScript support.
SolidJS is catching up with SolidStart, but enterprise adoption is still limited.

✅ Winner: React

🧑‍💻 5. Ideal Use Cases

Use Case	React	Vue	SolidJS
Enterprise-Scale Apps	✅	✅	⚠️ (emerging)
Lightweight Widgets	⚠️	✅	✅
Edge Rendering (SSR)	✅ (Next.js)	✅ (Nuxt)	✅ (SolidStart)
Real-Time Dashboards	⚠️	✅	✅
Developer Onboarding	⚠️	✅	⚠️

✅ Vue remains the sweet spot for rapid onboarding and productivity.
✅ React rules at scale and cross-platform ecosystems.
✅ SolidJS wins when performance matters most.

🏁 Conclusion: Which Should You Use in 2025?

🧩 Choose React if you're working in a large team, need mature libraries, or plan to use Next.js.
⚡ Choose SolidJS for building highly-performant, reactive apps with minimal overhead.
🎨 Choose Vue if you want a smooth developer experience, fast prototyping, and clear syntax.

All three are solid choices—pun intended—but the right tool depends on your context.

💬 What’s your go-to JavaScript framework in 2025?

Let's chat in the comments 👇

Forem: Hamza Khan

NestJS vs. Express: Why Structure Beats Speed in the Long Run 🚀

🏗️ Express.js – The Minimalist Approach

🏛️ NestJS – The Opinionated Framework

⚡ Code Comparison: Express vs NestJS

Express.js

NestJS

🚀 Why Structure Beats Speed in the Long Run

🔮 Final Thoughts: Which Should You Pick in 2025?

PostgreSQL vs. MongoDB in 2025: Which Database Should Power Your Next Project?

1. PostgreSQL in 2025: A Hybrid Relational Beast

2. MongoDB in 2025: The Document-First Distributed Engine

3. Performance Benchmarks: 2025 Insights

4. Decision Framework: How to Choose in 2025

5. The Hybrid Approach

Final Thoughts

💡 Mastering SQL Query Optimization: Tips Every Backend Developer Should Know

📌 1. Always Use Indexes (Wisely)

⏳ 2. Limit Data Early

🔄 3. Use JOINs Instead of Multiple Queries

🧮 4. Avoid SELECT * (Seriously!)

📈 5. Analyze and Optimize Execution Plans

🔁 6. Watch for N+1 Query Problems

🧠 7. Use Aggregations Wisely

🧰 8. Use Caching When Needed

📊 9. Monitor & Benchmark Regularly

🚀 Final Thoughts

💬 What’s your favorite SQL optimization tip? Or the biggest mistake you once made?

⚔️ Node.js vs Bun vs Deno: Who Rules the Server in 2025? 🚀

📦 TL;DR Comparison

🧪 Benchmark Snapshot (2025)

Node.js

Deno

Bun

Results (Requests/sec on M2 chip)

🌍 Ecosystem Maturity

🔐 Security Considerations

🚀 Use Case Recommendations

🔮 The Future in 2025

🧠 Final Thoughts

⚔️ Next.js vs Qwik: Who Wins the Performance Race in 2025? 🚀

⚡ TL;DR: Quick Comparison

🏎️ Hydration: The Real Race

Next.js (with React)

Qwik

🧪 Benchmark Snapshot (2025)

📦 Dev Experience

Next.js

Qwik

🔧 Use Case Comparison

🧠 Final Thoughts

⚛️ React 19 & Beyond: What’s New and What’s Next in 2025 🚀

🧠 Key Highlights in React 19

✅ 1. Actions API (Server Actions)

Why it matters:

🔁 2. Use Hook Outside Components

⚡ 3. React Compiler (Still Experimental)

🎯 4. Improved Form Handling

🎨 5. Improved Suspense and Streaming Support

🛣️ The Road Ahead for React

🔍 TL;DR – Why React 19 Matters

🗣️ Your Turn

🧩 Event-Driven Architecture in JavaScript Applications: A 2025 Deep Dive

🚦 What Is Event-Driven Architecture?

📌 Core Concepts:

💻 EDA in Node.js

✅ Why It Works:

⚛️ EDA in Frontend JavaScript

🔄 Event Bus with Vanilla JS

💡 Use Cases:

📡 Event-Driven State Management

🛠️ Building Event-Driven Systems in JavaScript (Best Practices)

🏗️ Real-World Examples

🧠 When NOT to Use EDA

📌 Final Thoughts

🔍 Everything You Need to Know About `this` in JavaScript (2025 Edition)

🚀 What is this?

📌 Rule 1: Global Context

📌 Rule 2: Object Method Context

📌 Rule 3: Standalone Function Context

🚀 What is `this`?

📌 Rule 5: Arrow Functions (Lexical `this`)

📌 Rule 6: `call`, `apply`, and `bind`

🔍 Deep Dive: `this` in ES Modules

🗨️ What are your biggest `this`-related bugs or insights? Drop them in the comments!

⚙️ Code Splitting with Dynamic `import()`

🏆 My Pick in 2025: `pnpm`