DEV Community: Iz Mroen

Bun: The JavaScript Runtime That's Making Node.js Sweat

Iz Mroen — Wed, 04 Mar 2026 12:08:29 +0000

Fast, elegant, and all-in-one — Bun is reshaping how JavaScript developers think about their toolchain.

What Is Bun?

If you've been following the JavaScript ecosystem lately, you've probably heard the buzz around Bun. But what exactly is it?

Bun is a modern, all-in-one JavaScript runtime built from scratch by Jarred Sumner and first released in 2022. It's designed to be a drop-in replacement for Node.js, meaning you can (in most cases) take your existing Node.js project, run it with Bun instead, and immediately get massive performance improvements — with zero code changes.

But Bun isn't just a runtime. It's three tools in one:

⚡ A JavaScript/TypeScript runtime (replaces Node.js)
📦 A package manager (replaces npm, yarn, pnpm)
🧪 A test runner (replaces Jest, Vitest)

Think of it as the Swiss Army knife of the JavaScript world.

Why Was Bun Created?

Node.js is nearly 15 years old. It was revolutionary when it launched, but it carries a lot of historical baggage: slow startup times, a somewhat clunky module system, and a toolchain that requires installing and configuring multiple separate tools just to get started.

Bun was created with a simple but ambitious goal: make JavaScript development fast, simple, and fun again.

Instead of building on top of V8 (the engine used by Node.js and Chrome), Bun is built on JavaScriptCore — the engine that powers Safari. JavaScriptCore has a notoriously fast startup time, and combined with Bun being written in Zig (a low-level systems language), the performance gains are remarkable.

Core Features Explained

1. The Runtime

At its heart, Bun runs JavaScript and TypeScript. What makes it special is what it supports natively, without any configuration:

TypeScript out of the box

# No ts-node, no tsc, no config needed
bun run my-file.ts

You just... run TypeScript. That's it. Bun transpiles it on the fly.

JSX support

bun run app.jsx

Works out of the box, even outside of a React project setup.

Native ES Modules AND CommonJS

Node.js made (and still makes) the transition between import/export (ESM) and require() (CJS) a painful experience. Bun handles both formats seamlessly, even mixing them in the same project.

Web-standard APIs

Bun implements many browser APIs directly — fetch, Request, Response, ReadableStream, WebSocket, Blob, FormData — no polyfills needed. Your code becomes more portable between the browser and the server.

2. The Package Manager

Bun's package manager is a direct replacement for npm, yarn, and pnpm. And it's brutally fast.

bun install        # Install all dependencies
bun add express    # Add a package
bun remove lodash  # Remove a package
bun update         # Update packages

How much faster? Benchmarks consistently show Bun installing packages 10x to 30x faster than npm, thanks to:

A global module cache (packages are only downloaded once, ever)
Binary lockfile format (bun.lockb) instead of JSON
Parallel downloads and installs

npm install     → ~15 seconds (cold cache)
bun install     → ~1.5 seconds (cold cache)
bun install     → ~200ms (warm cache)

Bun is also compatible with package.json, so there's no migration needed. Just swap npm install for bun install.

3. The Test Runner

Bun ships with a built-in test runner that is Jest-compatible by design. If you've written Jest tests before, you can run them with Bun immediately.

import { describe, it, expect } from "bun:test";

describe("math", () => {
  it("should add two numbers", () => {
    expect(1 + 1).toBe(2);
  });

  it("should handle strings", () => {
    expect("hello " + "world").toBe("hello world");
  });
});

Run tests with:

bun test

Features include:

describe, it, test, expect — all the classics
Mocking with mock() and spyOn()
Snapshot testing
Coverage reporting with bun test --coverage
Watch mode with bun test --watch

And yes — it's significantly faster than Jest, especially on large test suites.

Bun vs Node.js: A Quick Comparison

Feature	Node.js	Bun
Engine	V8	JavaScriptCore
Language (runtime)	C++	Zig
TypeScript support	Needs ts-node/tsx	Native
Package manager	npm (separate)	Built-in
Test runner	Needs Jest/Vitest	Built-in
Bundler	Needs webpack/esbuild	Built-in
Web APIs (fetch, etc.)	Polyfill needed	Native
Startup speed	~50ms	~5ms
npm compatibility	✅	✅

Getting Started with Bun

Installation

# macOS, Linux, WSL
curl -fsSL https://bun.sh/install | bash

# Windows (native, via PowerShell)
powershell -c "irm bun.sh/install.ps1 | iex"

# Via npm (meta, I know)
npm install -g bun

Your First Bun App

Create a new project:

bun init

This creates a basic project with a package.json, a tsconfig.json, and an index.ts entry file.

// index.ts
const server = Bun.serve({
  port: 3000,
  fetch(request) {
    return new Response("Hello from Bun! 🐢");
  },
});

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

Run it:

bun run index.ts

That's a full HTTP server, in TypeScript, with zero dependencies, zero configuration, running in milliseconds.

Using Bun with an Existing Node.js Project

It's often as simple as:

# Replace npm install
bun install

# Replace node index.js
bun run index.js

# Replace npm run dev
bun run dev

Bun implements the Node.js API (fs, path, http, process, etc.) so most existing code works without modification.

Bun's Built-in Bundler

One more thing Bun does: bundling. You can bundle your frontend or backend code for production:

bun build ./src/index.ts --outdir ./dist --target browser

Options include:

--target browser or --target bun or --target node
--minify for production builds
--sourcemap for debugging
Tree shaking enabled by default

It's not quite at the level of Vite or webpack for complex frontend apps yet, but for backend bundling and simple frontend use cases, it's incredibly convenient.

Should You Switch to Bun?

For new projects: Absolutely consider it. Bun's developer experience is excellent, the performance is real, and the all-in-one approach removes a lot of toolchain friction.

For existing Node.js projects: It depends. Most projects migrate easily. However, some packages that rely on native Node.js addons or very specific internal APIs may have compatibility issues. Always test before switching production workloads.

For server-side rendering, APIs, scripts: Bun shines here. Performance improvements are most noticeable in I/O-heavy and startup-sensitive workloads.

Caveats and Things to Know

Bun is still maturing. It hit v1.0 in September 2023, and while it's production-ready for many use cases, some Node.js APIs are still being implemented.
Windows support came later and is improving rapidly, but Linux/macOS remain the primary targets.
Not 100% Node.js compatible. The vast majority of packages work, but some native addons don't.
Community and ecosystem are growing fast, but Node.js still has a much larger community for now.

Conclusion

Bun represents a genuine rethinking of the JavaScript developer experience. Instead of assembling a toolchain from five different tools, you get one fast, cohesive tool that does it all — and does it blazingly fast.

Is it going to replace Node.js overnight? Probably not. But it's already a legitimate choice for new projects, and its influence is pushing the entire JavaScript ecosystem forward. Even the Node.js team has been motivated to improve startup time and add features like native TypeScript support in response to Bun's rise.

Whether you adopt it today or watch it from a distance, Bun is absolutely worth understanding. The future of JavaScript tooling is fast, and Bun is leading the charge.

Try it out:

🌐 Official site: bun.sh
📖 Docs: bun.sh/docs
💻 GitHub: github.com/oven-sh/bun

Have you tried Bun in a project? Drop your experience in the comments below — I'd love to hear how it went!

Understanding Download & Upload: A Technical Breakdown for Developers

Iz Mroen — Fri, 19 Dec 2025 15:13:25 +0000

As developers, we interact with downloads and uploads daily, whether it’s fetching data from an API or sending files to a server. But do you truly understand what happens under the hood? Let’s break it down.

1. What Are Download and Upload?

Download: Receiving data from a server to your device.

Example: Downloading an Ubuntu ISO or fetching JSON from an API.

Upload: Sending data from your device to a server.

Example: Posting a photo to Instagram or sending a file to S3.

Both involve moving data packets over the internet using standard networking protocols.

2. The Role of Bits and Bytes

Everything on the internet is data, measured in bits and bytes:

1 byte (B) = 8 bits (b)
1 kilobyte (KB) = 1024 bytes
1 megabyte (MB) = 1024 KB

Download speed is usually shown in MB/s (megabytes per second).
Internet providers often advertise speed in Mbps (megabits per second).

Note: 1 MB/s ≈ 8 Mbps.

3. How Downloads and Uploads Actually Work?

When you download a file:

1. Establish a Connection:

Your device requests a file from the server, which responds and starts sending data.

2. Data is Broken Into Packets:

TCP/IP splits the file into small chunks called packets.
Each packet contains:

Source and destination addresses
A portion of the data
A sequence number to reconstruct the file

3. Transmission Over the Network

Packets travel through routers, switches, and cables.
They might arrive out of order, and TCP ensures they are reassembled correctly.

4. Error Checking

TCP checks for lost or corrupted packets and requests retransmission if needed.

5. Reassembly

Once all packets arrive, your device reassembles them into the original file.

Visualization

Download: Server ---> [Packets] ---> Your Device
Upload:   Your Device ---> [Packets] ---> Server

4. Download and Upload Speeds

Speed depends on several factors:

Internet plan (fiber, DSL, cable)
Server capacity (how many users are downloading simultaneously)
Network quality and latency

Example:
4 MB/s download of a 5.9 GB file
Time remaining ≈ 24 minutes

Tip: Upload speeds are often lower than download speeds for most consumer ISPs.

5. Why Developers Should Care

Understanding these concepts helps in:

Optimizing file uploads and downloads in apps
Managing bandwidth and improving UX for large file transfers
Troubleshooting slow network issues

6. TL;DR

Download = Receiving data
Upload = Sending data
Both use TCP/IP and packet transmission
Speed and reliability depend on your network, server, and protocol efficiency

How to Optimize the Performance of Your React Website

Iz Mroen — Sat, 11 Oct 2025 11:37:01 +0000

In today’s web ecosystem, speed is not an option — it’s a necessity. A slow application frustrates users, degrades the user experience, and negatively impacts your SEO ranking. For React developers, understanding and applying proper optimization techniques is crucial to ensure optimal React performance.

This article is a complete guide to help you optimize your React site. We’ll explore practical techniques, measurement tools, and best practices to transform a sluggish app into a lightning-fast machine. Get ready to boost the React speed of your projects!

Measure Before You Optimize: The Golden Rule

Before diving headfirst into optimization, you must identify your bottlenecks. Blindly optimizing is often a waste of time. Fortunately, we have powerful tools to analyze our application's performance.

Lighthouse

Built directly into Chrome DevTools, Lighthouse is your first ally. It audits your site across multiple criteria — including performance — and provides a score with clear improvement suggestions.

How to use it:

Open your browser’s developer tools (F12 or Ctrl+Shift+I).
Go to the “Lighthouse” tab.
Click “Generate report.”

You’ll get a detailed report showing load times, interactivity, and visual stability for your page.

React Profiler

The React Profiler, available through React Developer Tools, is essential to analyze what’s happening inside your app. It lets you record interactions and see why and how often your components re-render.

It highlights unnecessary renders — one of the main causes of slowness in React applications.

Core Optimization Techniques

Once you’ve identified performance issues, let’s move on to the solutions. Here are the fundamental techniques to optimize React performance.

Memoization with `React.memo`, `useCallback`, and `useMemo`

Memoization is a technique where the result of an expensive function call is cached and reused when the same inputs occur again. In React, this prevents unnecessary re-renders.

`React.memo` for Components

React.memo is a Higher-Order Component (HOC) that prevents a functional component from re-rendering if its props haven’t changed.

// A component that might be expensive to render
const HeavyComponent = ({ data }) => {
  // ... complex logic
  return <div>{data.value}</div>;
};

// Optimize it using React.memo
export default React.memo(HeavyComponent);

`useCallback` for Functions

When passing a function as a prop to a child component (especially a memoized one), a new instance of that function is created on every parent render — breaking the optimization from React.memo.
useCallback solves this issue.

`jsx
import React, { useState, useCallback } from 'react';
import ChildComponent from './ChildComponent';

const ParentComponent = () => {
const [count, setCount] = useState(0);

// The function is memoized and will only be recreated if its dependencies change.
const handleClick = useCallback(() => {
console.log('Button clicked!');
}, []); // No dependencies — function created only once.

return (

setCount(count + 1)}>Increment

);
};
`

`useMemo` for Expensive Values

useMemo is similar to useCallback, but it memoizes a value (the result of a function) instead of a function. Use it to avoid recalculating heavy data on every render.

`jsx
import React, { useMemo } from 'react';

const MyComponent = ({ list }) => {
// This heavy computation will only run again if list changes.
const processedList = useMemo(() => {
return list.filter(item => item.isActive).map(item => {
// ... complex processing
});
}, [list]);

return (

{item.name}

);
};
`

Lazy Loading and Code Splitting

By default, bundlers like Webpack create a single JavaScript file (a “bundle”) containing all your app’s code. For large apps, this file can become huge, significantly slowing down initial load time.

Code splitting divides this bundle into smaller chunks that can be loaded on demand. Lazy loading ensures those chunks are only fetched when the user needs them.

React makes this easy using React.lazy and Suspense.

`jsx
import React, { Suspense, lazy } from 'react';
import { BrowserRouter as Router, Routes, Route } from 'react-router-dom';

// Import components lazily
const HomePage = lazy(() => import('./routes/HomePage'));
const AboutPage = lazy(() => import('./routes/AboutPage'));

const App = () => (

Loading...}>

} />
} />

);
`

Here, the AboutPage code is only downloaded and executed when the user navigates to the /about route.

Image Optimization

Images are often the heaviest assets on a web page.

Use modern formats: WebP offers much better compression than JPEG or PNG with similar quality.
Compress your images: Use tools like Squoosh or online services to reduce image size before uploading.
Implement lazy loading for images: Add the loading="lazy" attribute to <img> tags so browsers only load them when they enter the viewport.

html <img src="my-image.webp" alt="Image description" loading="lazy" width="800" height="600" />

React Performance Checklist

Here’s a quick checklist to ensure nothing is missed in your React projects:

[ ] Measure: Did I profile my app using Lighthouse and React Profiler?
[ ] Memoization: Am I using React.memo for components receiving complex props?
[ ] Optimization Hooks: Am I using useCallback and useMemo for heavy computations and functions?
[ ] Code Splitting: Is my app split by route using React.lazy and Suspense?
[ ] Images: Are my images compressed, in WebP format, and lazy-loaded?
[ ] Lists: For long lists, am I using virtualization (windowing)?
[ ] Bundle Size: Have I analyzed my bundle with a tool like webpack-bundle-analyzer?

Conclusion

Optimizing React performance isn’t black magic — it’s a disciplined process. By combining precise measurement with proven techniques like memoization, code splitting, and resource optimization, you can dramatically improve your app’s React speed.

Remember: performance optimization is not a one-time task but an ongoing process. Integrate these practices into your daily workflow to deliver fast, smooth, and delightful user experiences.

What is a JavaScript Bundler?

Iz Mroen — Thu, 25 Sep 2025 12:08:10 +0000

When building modern web applications, your project usually contains many files:

JavaScript modules (app.js, utils.js, etc.)
Stylesheets (styles.css)
Assets (images, fonts, etc.)
External libraries (React, Lodash, etc.)

The browser doesn’t always understand how to handle these files directly, especially with modern ES6 imports and dependencies.

That’s where a bundler comes in.

A JavaScript bundler is a tool that takes all your code and dependencies and combines them into one (or a few) optimized files that the browser can easily load.

How does a bundler work?

You define an entry point (for example index.js).
The bundler looks at all the import statements and builds a dependency graph.
It collects everything your app needs: JavaScript, CSS, images, etc.
Finally, it outputs a bundle file (e.g. bundle.js) that the browser can run.

Why use a bundler?

Performance: Fewer requests → faster loading.
Compatibility: Converts modern JS (ES6+) into code older browsers can run.
Optimization: Minifies code, removes unused code (tree-shaking).
Developer Experience: Supports hot reloading, dev servers, and more.

⚡ Example: Vite

Vite is one of the most popular modern bundlers.

During development, Vite uses native ES modules in the browser for speed.

For production, it bundles your code with Rollup (another bundler).

Example project with Vite

# Create a new Vite project
npm create vite@latest my-app

cd my-app
npm install
npm run dev

npm run dev starts a lightning-fast dev server.
npm run build bundles your project into optimized static files ready for deployment.

In short

A JavaScript bundler is like a packaging machine — it gathers all the scattered pieces of your application and delivers them as a clean, optimized package to the browser.

Understanding the Difference Between package.json and package-lock.json

Iz Mroen — Sat, 06 Sep 2025 00:04:14 +0000

What is package.json?

The package.json file is the manifest file of your Node.js project.
It contains:

Metadata about your project (name, version, description, author, etc.)
Scripts you can run (like start, build, test)
Dependencies and devDependencies, listed with version ranges (^, ~, etc.)

This file is created manually (via npm init) and is meant to be human-readable and editable.

What is package-lock.json?

The package-lock.json file is automatically generated when you run npm install.
It:

Locks the exact versions of every dependency and sub-dependency
Ensures consistent installs across different machines and environments
Makes installation faster by skipping version resolution (since it’s already defined)

Feature	`package.json`	`package-lock.json`
Purpose	Defines project metadata & dependencies	Locks exact versions for reproducible installs
Created by	Developer (manual / `npm init`)	npm (auto-generated on install)
Versioning	Version ranges allowed (`^`, `~`)	Exact versions of all dependencies
Human editable?	Yes	No (should not be manually edited)
Consistency	Not guaranteed	Guaranteed same versions everywhere
Install speed	Slower (needs to resolve versions)	Faster (uses already resolved versions)
Commit to Git?	Yes (mandatory)	Yes (highly recommended)

Why Both Files Are Important

package.json provides flexibility: it allows updates to newer minor/patch versions of dependencies.
package-lock.json ensures stability: every developer and production environment installs exactly the same versions, avoiding “it works on my machine” problems.

The Vibe Trap: How AI "Vibe Coding" is Quietly Undermining Junior Developers' Careers

Iz Mroen — Sat, 16 Aug 2025 12:43:39 +0000

There’s a new term floating around in the tech world: "vibe coding." It sounds cool, right? It’s the idea that you can just "feel out" what you want an AI to do, type a quick prompt, and a few seconds later, you have a working block of code. For junior developers and aspiring coders, this seems like a dream come true. You can build an app without ever truly learning how the pieces fit together.

But here’s the harsh reality: this shortcut is a career death trap.

The problem isn't the AI itself. AI is an incredible tool, and seasoned developers are using it to become even more efficient. The problem is the "vibe" part—the reliance on magic over understanding. It’s like using a powerful calculator to solve a math problem without ever learning what addition or multiplication actually means. You get the right answer, but you have no idea why, and the moment a new, slightly different problem comes along, you’re completely lost.

For junior developers, this is a dangerous path. The traditional journey of a programmer is a series of struggles and breakthroughs. You spend hours wrestling with a single bug, only to have that "Aha!" moment when you finally solve it. That struggle is where the real learning happens. It’s how you build the mental models of how software works, how systems communicate, and how to debug complex problems.

"Vibe coding" bypasses this crucial learning process. Instead of building a foundation of fundamental skills, it creates what some experts are calling "pseudo-developers." These are people who can generate code, but they can't understand, debug, or maintain it. When that AI-generated code inevitably breaks—and it will—they are helpless. They can’t fix a security vulnerability, they can’t optimize a slow function, and they can't adapt the system to new requirements.

The tech industry is already starting to notice. While some companies are dazzled by the initial speed of AI-assisted development, they are quickly realizing the massive technical debt that comes with it. AI-generated code is often messy, lacks proper documentation, and ignores important edge cases. For senior developers, this means spending more time cleaning up and refactoring "vibe-coded" projects than was ever saved.

In this new reality, the real value of a developer is shifting. It's no longer just about writing lines of code. It's about:

Problem-Solving: The ability to break down a complex challenge and design a robust solution from the ground up.
Debugging: The detective work of finding and fixing a bug when something goes wrong. This skill is priceless.
System Architecture: Thinking about the bigger picture—how different components of an application fit together and how they will scale in the future.
Critical Thinking: The ability to review and question the code, whether it was written by a human or an AI.

The hard truth is, if a task can be done with a simple prompt, it’s not a high-value skill. Companies are looking for people who can do what AI can't: think, reason, and create.

So, what's a junior developer to do? Don’t throw out your AI tools. Instead, change how you use them. Make AI your co-pilot, not your autopilot.

Practice with AI off: Set aside time to code without any AI assistance. Let yourself struggle and solve problems the old-fashioned way.
Use AI for understanding: Instead of asking the AI to "write this code," ask it to "explain this concept" or "what's a more efficient way to do this?"
Review everything: Treat every line of AI-generated code as a suggestion. Read it, understand it, and make sure it makes sense before you use it.

AI is here to stay, and it will undoubtedly change the developer landscape. But for junior developers, the path to a sustainable and rewarding career still relies on building a strong foundation. Don't fall for the vibe trap. Don't let a convenient shortcut today prevent you from becoming a truly skilled and valuable developer tomorrow.

Mastering GraphQL Basics: Queries, Mutations, and Schema Explained

Iz Mroen — Sun, 03 Aug 2025 13:51:24 +0000

If you’ve ever worked with REST APIs, you know the pain: fetching too much data, or not enough. You end up with multiple endpoints, over-fetching, or under-fetching data. That’s where GraphQL comes in.

In this blog, I’ll walk you through:

What GraphQL is (in simple words)
Why it’s useful
Basic concepts (Query, Mutation, etc.)
A simple example with code

What is GraphQL?

GraphQL is a query language for APIs, and a runtime for executing those queries.

Simply put: With GraphQL, the client decides what data it wants — not the server.

Instead of getting all data from a REST endpoint like /api/users, you can ask for only the fields you want: like the user's name and email, and ignore everything else.

GraphQL vs REST

REST API	GraphQL
Multiple endpoints	Single endpoint
Over-fetch/under-fetch	Get exactly what you need
Fixed structure	Flexible and customizable

GraphQL Basics

1. Query: To read/fetch data.

query {
  user(id: "1") {
    name
    email
  }
}

This query asks for the user with ID 1, but only returns their name and email.

2. Mutation: To create, update, or delete data.

mutation {
  createUser(name: "Sarah", email: "sarah@example.com") {
    id
    name
  }
}

This mutation creates a new user and returns the id and name.

3. Schema: Describes your data types and operations.
Example of a simple GraphQL schema:

type User {
  id: ID!
  name: String!
  email: String!
}

type Query {
  user(id: ID!): User
}

type Mutation {
  createUser(name: String!, email: String!): User
}

Example with Apollo Server (Node.js)
Let’s create a simple GraphQL server.

Step 1: Install dependencies

npm install apollo-server graphql

Step 2: Write your server code

const { ApolloServer, gql } = require('apollo-server');

const typeDefs = gql`
  type User {
    id: ID!
    name: String!
    email: String!
  }

  type Query {
    user(id: ID!): User
  }

  type Mutation {
    createUser(name: String!, email: String!): User
  }
`;

let users = [
  { id: '1', name: 'Alice', email: 'alice@example.com' },
];

const resolvers = {
  Query: {
    user: (_, { id }) => users.find(user => user.id === id),
  },
  Mutation: {
    createUser: (_, { name, email }) => {
      const newUser = {
        id: String(users.length + 1),
        name,
        email,
      };
      users.push(newUser);
      return newUser;
    },
  },
};

const server = new ApolloServer({ typeDefs, resolvers });

server.listen().then(({ url }) => {
  console.log(`🚀 Server ready at ${url}`);
});

Now go to http://localhost:4000 and test your queries in the Apollo Playground!

Final Thoughts

GraphQL is a powerful tool for building flexible and efficient APIs. It puts data control in the hands of the client, and simplifies how we fetch and manipulate data.

Whether you're building a blog, an e-commerce app, or a chat app — GraphQL is worth learning!

Useful Resources

If you liked this intro, follow me for more dev tips!
Feel free to ask questions or share your GraphQL experience in the comments.

Edge-First Web Development: Why the Future of the Web Is Happening Closer Than You Think

Iz Mroen — Wed, 16 Jul 2025 09:48:14 +0000

Imagine this: your app loads instantly, feels personal, and responds faster than ever—no matter where your users are in the world. That’s not a dream. That’s the edge.

A Quiet Shift Is Happening in Web Dev

Something’s changing in how we build for the web—but it’s subtle. You won’t see flashy headlines about it (yet), but you’ll feel it when you visit a site and everything just works—instantly.

This isn’t magic. It’s called edge-first development, and it’s probably going to be how we build everything in a few years.

So, What Is the Edge?

If you're imagining some cool hacker term, you're not far off.

But in practice, the “edge” just means servers that are physically closer to your users. Instead of sending every request across the planet to a single centralized server, we run parts of the app on mini-servers all over the world—at the "edge" of the network.

Think of it like this:
You wouldn’t fly to another country just to grab a coffee. Why make your app do it?

Why This Actually Matters ?

Here’s what happens when you start thinking edge-first:

⚡Speed That Feels Instant: Your app loads fast—really fast—because it’s not waiting on distant servers. That’s especially noticeable on mobile or slower connections.

🌐 It Feels Personal: You can tailor the experience to where the user is. Show prices in the right currency. Local inventory. Even languages. And you do it without crazy backend complexity.

🧩 Better Scaling Without Losing Sleep: Traffic spikes? No problem. The load is spread out automatically across the edge network. You don’t have to worry about that one server dying in the middle of the night.

🧘 More Resilient by Default: If one edge node goes down, others are already ready to step in. It’s like automatic backup, baked right in.

Okay, But How Do I Start?

You don’t need to throw away everything and start over.
Some tools and platforms are already built with the edge in mind:

Next.js – especially with its App Router and server components

Vercel Edge Functions

Cloudflare Workers

Remix.run

Deno Deploy or even Bun

These let you write logic that runs closer to your users—without rewriting your whole app.

The Future Is Distributed

The old way of doing things—giant monolithic servers somewhere in Virginia or Frankfurt—isn’t cutting it anymore. Users expect snappy, tailored, always-on experiences.

And let’s be honest: once you’ve built something that loads in under a second anywhere on Earth, there’s no going back.

Final Thoughts

Edge-first development isn’t a buzzword. It’s just a smarter way to build in a global, impatient, mobile-first world.

It doesn’t mean changing everything overnight. But it does mean thinking a little differently about where your code runs.

If you're building for the web in 2025, it’s time to start building for the edge.

What’s your take on edge-first development?
Are you already deploying to the edge? Curious about trying it out? Let’s talk in the comments 👇

MERN Stack Developer Roadmap 2025

Iz Mroen — Wed, 05 Feb 2025 09:52:00 +0000

Embarking on the journey to become a proficient MERN Stack Developer requires a structured roadmap. The MERN Stack, comprising MongoDB, Express.js, React.js, and Node.js, is a powerful combination for building full-stack web applications. Here's the ultimate roadmap to guide you through every essential step in 2025.

Step 1: 🌐 Master Web Basics

Understanding the fundamentals of how the web works, including client-server architecture, HTTP protocols, and browser mechanics, is crucial before diving into development.

Step 2: 🖥️ HTML/CSS

Learn the core building blocks of web pages:

HTML: Structure your content effectively.
CSS: Style your pages to be visually appealing.
Responsive design principles for mobile compatibility.

Step 3: ✨ Deep Dive into JavaScript

Master JavaScript as it's the backbone of the MERN stack:

ES6+ features (let/const, arrow functions, spread/rest operators).
Asynchronous JavaScript (Promises, Async/Await).
DOM manipulation and event handling.

Step 4: 🗂️ Version Control

Learn Git and GitHub for source code management:

Basic Git commands (clone, commit, push, pull).
Branching and merging strategies.
Collaborative workflows with GitHub.

Step 5: 🐍 Node.js

Dive into server-side JavaScript with Node.js:

Event-driven architecture.
Working with the file system.
Creating simple HTTP servers.

Step 6: 🗃️ Express.js

Build robust APIs using Express.js:

Setting up routes and middleware.
RESTful API development.
Error handling and security practices.

Step 7: 📦 NPM

Understand Node Package Manager (NPM):

Installing and managing packages.
Creating and publishing your own modules.
Semantic versioning.

Step 8: 📚 MongoDB

Master the NoSQL database MongoDB:

CRUD operations.
Schema design and data modeling.
Aggregation framework.

Step 9: 🌟 React.js

Learn React for building dynamic user interfaces:

JSX syntax.
State management and hooks.
Component-based architecture.

Step 10: 🔐 JWT

Implement authentication using JSON Web Tokens (JWT):

Secure user authentication.
Token generation and verification.

Step 11: 🚀 App Deployment

Deploy your MERN applications:

Hosting options (Heroku, Vercel, Netlify).
Setting up CI/CD pipelines.
Managing environment variables.

Step 12: 🐳 Docker Basics

Understand containerization with Docker:

Creating Dockerfiles.
Building and running containers.
Docker Compose for multi-container apps.

Step 13: ☁️ Explore Cloud Services

Gain knowledge of cloud platforms:

AWS, Azure, Google Cloud basics.
Deploying applications on the cloud.
Serverless architecture.

Step 14: 🔄 CI/CD with GitHub Actions

Automate workflows using GitHub Actions:

Setting up continuous integration and deployment.
Writing custom workflows.

Step 15: 🧪 Testing with Jest

Ensure code quality through testing:

Unit testing with Jest.
Test-driven development (TDD).
Integration and end-to-end testing.

Step 16: 📜 API Documentation

Document your APIs effectively:

Using tools like Swagger or Postman.
Writing clear and concise API documentation.

Step 17: 🗂️ Database Design Principles

Learn how to structure databases efficiently:

Normalization and denormalization.
Indexing for performance.
Relationships and data integrity.

Step 18: 📢 Build Portfolio

Showcase your skills with a professional portfolio:

Highlight projects that demonstrate MERN proficiency.
Clean, responsive design.
Include links to GitHub repositories.

Step 19: 💼 Resume Creation

Craft a compelling resume:

Focus on relevant skills and projects.
Use action verbs and quantify achievements.
Keep it concise and well-structured.

Step 20: 🔍 Interview Preparation

Prepare for technical interviews:

Practice coding challenges (LeetCode, HackerRank).
Study data structures and algorithms.
Mock interviews and behavioral questions.

Step 21: 💡 Soft Skills Development

Enhance essential soft skills:

Communication and teamwork.
Problem-solving techniques.
Time management for developers.

Step 22: 🗂️ Build Real-World Projects

Apply your knowledge in practical scenarios:

E-commerce platforms.
Social media applications.
RESTful APIs and microservices.

Step 23: 🔍 Job Hunting

Start your job search:

Apply to MERN Stack Developer roles.
Network with industry professionals.
Tailor applications to specific job descriptions.

START Your MERN Journey Today!

Following this roadmap will equip you with the skills needed to excel as a MERN Stack Developer in 2025. Stay consistent, keep building projects, and continuously learn to achieve your goals.

Amazon Simple Queue Service (SQS)

Iz Mroen — Fri, 27 Sep 2024 21:31:05 +0000

Amazon Simple Queue Service (SQS) is a fully managed messaging service offered by AWS (Amazon Web Services). It enables applications to communicate asynchronously by sending and receiving messages through queues. SQS is particularly useful for decoupling components of a distributed system, thereby improving the scalability and resiliency of the application.

Key Features:

1. Standard Queues: Provides at-least-once delivery with no strict ordering guarantees.
2. FIFO (First-In-First-Out) Queues: Ensures messages are delivered in the exact order they were sent, eliminating duplicates.
3. Automated Management: SQS handles infrastructure, scaling, and redundancy, ensuring high availability.
4. Durability and Security: Messages are stored securely with encryption at rest, guaranteeing confidentiality and integrity.

SQS is commonly used in cloud architectures to transmit messages between services such as microservices or Lambda functions. It helps to balance loads, handle traffic spikes, and prevent system failures.

Understanding Git: A Beginner's Guide !!

Iz Mroen — Wed, 27 Dec 2023 21:00:07 +0000

Hey everyone 👋, In this article I will introduce Git in general by explaining some basic terms 💡 so that in the next article 🌟 we will see the commands and some other things

✅ the first thing we need to know what's Git ??

1. What is Git ❓

Git is a version management tool or VCS in English (version control system) which allows store a set of files 🗃️ while maintaining a timeline 🎞️ of all changes which were carried out on it.

It is part of the family of so-called decentralized VCS because in its operation each developer 👨‍💻 will have a complete local copy of the history of his source code.

✅ Now let's explore some terms that one needs to learn to better understand the concept of Git .

2. Basic operation of Git ⚙️:

Git is a decentralized version management system. This means that the repository data Git is not located on a remote server but on your machine.

. a Git repository :

A “repository” corresponds to the copy and import of all the files of a project in Git. There are two ways to create a Git repository:

You can import 📥 an existing directory into Git.

You can clone 📋 an already existing Git repository.

. File states :

Git manages 3 states in which files can reside: modified, indexed, & committed.

Modified means that you have modified 🔄 the file but it has not been yet been validated in base.
Indexed (“staged”) means that you have marked a file modified in its version current so that it is part of the next project snapshot ➡️.
Committed means that the data is stored securely in your local database 🛢️.

. Work areas :

File states are linked to work areas in Git. Depending on its condition, a file will be able to appear in this or that work area. Every Git project is composed of three sections: the working directory, the staging area and the repository.

The working directory corresponds to a unique extraction of a version of the project. Files are extracted from the compressed database located in the directory Git and are placed on disk so that they can be used or modified.

The staging area corresponds to a simple file, generally located in the Git directory, which stores information about what will be part of the next snapshot or the next commit.

The Repository is where Git stores metadata and the database from the objects in your project. This is the main part or the heart of Git.

for the next article we will see the basic commands and some ...🧠🌟

Hooks in React

Iz Mroen — Mon, 18 Dec 2023 19:21:47 +0000

1 Definitions :

To explain the concept of hooks in React, it is important to start by explaining the terms below :

✔️A React component is a function that renders an HTML element. React components can be either classes or functions.

✔️React classes class components) use the React lifecycle to manage state and component events.

✔️The React lifecycle is a set of events that occur during the life of a React component. Lifecycle events allow developers to interact with the React component at different points in its life.

✔️React functions (functions components) use hooks to manage state and component events.

2. What is a Hook?

Hooks are functions that allow developers to manage state and access React lifecycle features without having to write a class.

To explain hooks, we can use the following analogy:

React classes are like washing machines. They have a life cycle that allows them to wash the laundry.

React functions are like washing machines without a lifecycle. They must be used with specific tools for washing laundry.

Hooks are these specific tools ⚙️ They allow React functions to access React lifecycle features.

🔸 The UseState() Hook:

The useState() Hook : Allows you to manage the state of a React component.

function App() {
    const [number, setNumber] = useState(0);

    return (
       <div>
          <h1>Number: [number)</h1>
          <button onClick={() => setNumber(number+ 1)}>+1</button>
       </div>
    );
 }

This React component uses the useState() hook to manage the state of the number . The number variable represents the current state of the number. The setNumber() function allows you to modify the state of the number .

➡️The useState() hook returns 2 values : the current value of the state & a function that allows to modify the state.

📌There are many hooks available, each with their own purpose.

🗃️Here are some of the most common hooks:

• useState(): Allows you to manage the state of a React component.
• useEffect(): Allows you to react to changes in the environment of a React component.
• useContext(): Allows access to a context from a React component.
• useReducer(): Allows you to manage a complex state of a React component.
• useParams() …..etc

🔸 The UseEffect() Hook:

The useEffect() Hook allows a React component to perform actions at specific times and when certain properties or state change. It is useful for carrying out side effects, such as:

Data fetching

Update the DOM

Add or remove event listeners

The useEffect() hook takes 2 arguments: from a function and an array of dependencies :

useEffect(() => {
      // Code to execute after rendering the component
      // and after each update
   }, [dependency]);

✔️The function is executed after the component is rendered and after each update.

✔️The dependency table allows you to specify the values that should trigger execution of the function. If a value in the dependency array changes, the function is executed.

Example of using the useEffect() hook to update the DOM:

function App() {
  const [count, setCount] = useState(0);

  useEffect(() => {
    document.title = `Count: ${count}`;
  }, [count]);

  return (
    <div>
      <h1>Count: {count}</h1>
      <button onClick={() => setCount(count + 1)}>+1</button>
    </div>
  );
}

In this example, the useEffect() hook is used to update the page title each time that the value of the count variable changes. This is because the count variable is included in the dependency table.

Example of using the useEffect() hook to fetch data:

function App() {
  const [users, setUsers] = useState([]);

  useEffect(() => {
    fetch('https://api.github.com/users')
      .then((response) => response.json())
      .then((data) => setUsers(data));
  }, []);

  return (
    <ul>
      {users.map((user) => (
        <li key={user.id}>{user.login}</li>
      ))}
    </ul>
  );
}

In this example, the useEffect() hook is used to perform data fetching from the GitHub API . The function is executed only once , after the initial rendering of the component. That is due to the dependency table being empty [ ] .

✔️Hooks are a powerful way to manage state and side effects in React components.

✔️The useEffect() hook is particularly useful for performing asynchronous operations, such as data fetching.

Example: Add or remove event-listeners
It is possible to add or remove event listeners in a React component by using the useEffect() hook.

To add an event listener, simply use the addEventListener() function in the function of the useEffect() hook.

The addEventListener() function takes two arguments: the event to listen for and the function to callback that will be called when the event occurs.

window.removeEventListener(‘click’, handlclick]);

Here's an example of adding an event listener for a button click:

function App() {
  const [count, setCount] = useState(0);
  useEffect(() => {
    const button = document.getElementById('button');
    const handleClick = () => {
      setCount((prevCount) => prevCount + 1);
    };
    button.addEventListener('click', handleClick);
    return () => {
      // Cleanup the event listener when the component is unmounted
      button.removeEventListener('click', handleClick);
    };
  }, []);
  return (
    <div>
      <h1>Count: {count}</h1>
      <button id="button">+1</button>
    </div>
  );
}

DEV Community: Iz Mroen

Bun: The JavaScript Runtime That's Making Node.js Sweat

What Is Bun?

Why Was Bun Created?

Core Features Explained

1. The Runtime

2. The Package Manager

3. The Test Runner

Bun vs Node.js: A Quick Comparison

Getting Started with Bun

Installation

Your First Bun App

Using Bun with an Existing Node.js Project

Bun's Built-in Bundler

Should You Switch to Bun?

Caveats and Things to Know

Conclusion

Understanding Download & Upload: A Technical Breakdown for Developers

1. What Are Download and Upload?

2. The Role of Bits and Bytes

3. How Downloads and Uploads Actually Work?

1. Establish a Connection:

2. Data is Broken Into Packets:

3. Transmission Over the Network

4. Error Checking

5. Reassembly

4. Download and Upload Speeds

5. Why Developers Should Care

6. TL;DR

How to Optimize the Performance of Your React Website

Measure Before You Optimize: The Golden Rule

Lighthouse

React Profiler

Core Optimization Techniques

Memoization with React.memo, useCallback, and useMemo

React.memo for Components

useCallback for Functions

useMemo for Expensive Values

Lazy Loading and Code Splitting

Image Optimization

React Performance Checklist

Conclusion

What is a JavaScript Bundler?

How does a bundler work?

Why use a bundler?

In short

Understanding the Difference Between package.json and package-lock.json

What is package.json?

What is package-lock.json?

Why Both Files Are Important

The Vibe Trap: How AI "Vibe Coding" is Quietly Undermining Junior Developers' Careers

Mastering GraphQL Basics: Queries, Mutations, and Schema Explained

What is GraphQL?

GraphQL vs REST

GraphQL Basics

Edge-First Web Development: Why the Future of the Web Is Happening Closer Than You Think

A Quiet Shift Is Happening in Web Dev

So, What Is the Edge?

Why This Actually Matters ?

Okay, But How Do I Start?

The Future Is Distributed

Final Thoughts

MERN Stack Developer Roadmap 2025

Step 1: 🌐 Master Web Basics

Step 2: 🖥️ HTML/CSS

Step 3: ✨ Deep Dive into JavaScript

Step 4: 🗂️ Version Control

Step 5: 🐍 Node.js

Step 6: 🗃️ Express.js

Step 7: 📦 NPM

Step 8: 📚 MongoDB

Step 9: 🌟 React.js

Step 10: 🔐 JWT

Step 11: 🚀 App Deployment

Step 12: 🐳 Docker Basics

Step 13: ☁️ Explore Cloud Services

Step 14: 🔄 CI/CD with GitHub Actions

Step 15: 🧪 Testing with Jest

Step 16: 📜 API Documentation

Step 17: 🗂️ Database Design Principles

Memoization with `React.memo`, `useCallback`, and `useMemo`

`React.memo` for Components

`useCallback` for Functions

`useMemo` for Expensive Values