DevIdiot!

I got tired of online JSON formatters freezing my browser, so I built a purely client-side one 🚀

Look, we've all been there.You get a 5MB minified JSON response from a broken API. You copy it, google "Online JSON formatter", click the first link, paste it in, and... your browser tab completely locks up for 10 seconds.Worse, if that payload contains production user data or API keys, you just blindly uploaded it to some random backend server so it could run JSON.stringify().It’s a terrible workflow, and it’s a massive privacy leak.I finally got annoyed enough to fix this for my own daily use.

ReactJS SOLID Principle　~SRP (Single Responsibility Principle)~

In the context of React, this can be rephrased to mean that there should be only one reason to change a component or function.Let's start by looking at some bad code to make it easier to understand.import React, { useEffect, useState } from "react";import axios from "axios";type TodoType = { id: number; userId: number; title: string; completed: boolean;};export const TodoList = () => { const [data, setData] = useState<TodoType[]>([]); const [isFetching, setIsFetching] = useState(t

Zero-Copy Buffer Manipulation: Parsing Market Data at Memory Speed

Price feeds hit your server. About forty thousand messages per second, each one carrying an order ID, timestamp, price and quantity. Node.js receives them over TCP, and before your app logic gets to touch them, you're already racking up a cost, and several times over as well. Understanding what that cost is, and how to stop it, is what separates a node.js service that struggles under load from one that holds up. What happens when data arrives?When a TCP packet lands, your OS writes it into

How to Get a Virtual SMS Number for App Verification in 2026

*The Problem With Using Your Real Number*Every time you sign up for a new app or service, they ask for your phone number. This creates privacy risks:Your number ends up in data breach listsYou get spam calls and SMSPlatforms track you across services*The Solution: Virtual SMS Numbers*A virtual (temporary) phone number lets you receive SMS verification codes without exposing your real number.*How It Works*`// Example: Automate SMS verification with APIconst response = await fetch('https://tempnum

What is a runtime environment?

If you’re a developer, you already know that node.js is a runtime environment and how it was developed by binding C++ and V8 engine. But how do we visualize it?Being from non-tech background I kept thinking what is actually a runtime environment?, I had this vague idea seeing the name, but I searched about it, because I wanted to have the clear picture.• Basically To execute a code you need collections of software and hardware components. Why? Because software tells you how to execute that code

Your PDF and Image Tools Are Uploading Your Files to Strangers Servers

Your PDF and Image Tools Are Uploading Your Files to Strangers' ServersEvery time you merge a PDF or compress an image online, your files get uploaded to someone else's server. Think about that for a second.That contract you're merging? Uploaded. Those personal photos you're resizing? Uploaded. That medical document you're converting? You guessed it — uploaded to a server you don't control, in a country you might not know, with a retention policy buried in a 12-page privacy policy you didn

“Why Great Catering Is the Heart of Every Successful Event in Jaipur”

You can plan everything right.The venue. The décor. The music.But if the food feels off…guests notice.Let’s be honest.People may forget the lights.They don’t forget the food.Food Brings People TogetherGuests may come for you.But they bond over food.They stand near counters.They talk while eating.They share dishes.Good food creates moments.First Impressions Start With StartersThe first bite matters.Hot starters. Fresh taste. Quick service.That first plate sets the mood.If it feels right, everythi

Top CBSE School in Dharuhera

https://vivekanandschooldharuhera.com/Top CBSE School in Dharuhera | Best English Medium School in DharuheraChoosing the right school is one of the most important decisions for a child’s future. Vivekanand Public School Dharuhera is recognized as the Top CBSE School in Dharuhera and a trusted Best English Medium School in Dharuhera, providing quality education, strong moral values, and holistic student development in a safe and inspiring learning environment.Located at NRP Bass Road & M2K Co

**Scraping with BeautifulSoup feels like wading through molasses? I feel your pain.**

Scraping with BeautifulSoup feels like wading through molasses? I feel your pain.Here's the problem:We've all been there. You've got a cool project idea: analyzing Reddit sentiment, tracking competitor pricing, or even just gathering data for a side project. You fire up Python, import BeautifulSoup (bs4), and start scraping. Everything seems fine at first, but then… the slowdown hits. You're waiting seconds, sometimes even minutes, for each page to parse. Debugging feels impossible. Your script

Angular’s New debounced() Signal Explained

Every Angular developer has faced it, an input that spams the backend with every single keystroke. The classic solution involves pulling in RxJS and using debounceTime, but it requires converting signals to observables and thinking in streams. As of Angular v22, there’s a new, cleaner way. The new experimental debounced() signal primitive lets you solve this problem in a more declarative, signal-native way. This post walks through the old way and then refactors it to the new, showing you exactly

React Hooks Performance: How to Avoid Unnecessary Re-renders

Performance is the concern that separates production-quality React code from tutorial-grade code. Most React applications do not have a rendering problem — but the ones that do can feel sluggish and frustrating. The key is knowing when optimization matters and what tools actually help. When Does React Re-render?A component re-renders when:Its state changes — calling setState re-renders the component and all children.Its parent re-renders — even if props haven't changed, children re-render b

How to Add Link Previews to Your React App (With Code Examples)

When users share links in your React app, showing a rich preview — title, description, image — makes the experience feel polished and professional. Think Slack, Notion, or Twitter.In this guide, I'll show you two approaches: building it from scratch, and using an API to skip the hard parts. Why Link Previews Are TrickyTo generate a preview, you need to fetch the target URL and parse its <meta> tags (Open Graph, Twitter Cards, etc.). Simple in theory, but:CORS blocks you — browsers won

🧠 What is JSX in React?

JSX stands for JavaScript XML. It lets you write HTML-like code inside JavaScript, making UI creation easier in React.📘 Example:function App() { const name = "Aman"; return <h1>Hello, {name}</h1>;}✨ Key Points:• JSX looks like HTML but works inside JavaScript• You can use JavaScript expressions with {}• JSX is converted into React.createElement() behind the scenesJSX makes React code more readable and developer-friendly. 🚀

Build Discord-Style Rich Link Previews in React (Without CORS Issues)

Have you ever tried to build a link preview card—like the ones you see in Discord, Twitter, or Slack—only to be instantly blocked by CORS errors?If you try to fetch a URL directly from your frontend React application to scrape its <meta> tags, the browser's security model will stop you in your tracks. You have to do this from a backend. But instead of spinning up a whole Node.js/Puppeteer backend just to scrape OpenGraph tags, I’m going to show you how to do this in 5 minutes using a blazi

Deploying a TanStack Start App with Neon Postgres and Cloudflare Workers

URL: https://isaacfei.com/posts/deploy-tanstack-start-neon-cloudflareDate: 2026-02-23Tags: TanStack Start, Cloudflare Workers, Neon, Drizzle ORM, DeploymentDescription: A step-by-step guide to deploying a full-stack TanStack Start application with Neon serverless Postgres (via Drizzle ORM) to Cloudflare Workers, using GitHub integration for CI/CD.This guide walks through deploying a full-stack TanStack Start application to Cloudflare Workers with Neon as the serverless Postgres database, using D

Implementing a Simple Text Editor with Auto-Save Using TanStack Start

URL: https://isaacfei.com/posts/editor-autosave-tanstack-startDate: 2026-02-23Tags: TanStack Start, React, TanStack Query, Auto-save, EditorDescription: Build a document editor frontend with auto-save using TanStack Start, focusing on editor features and state management in the useDocumentEditor hook.This post walks through building a document editor frontend with auto-save using TanStack Start. The central piece is useDocumentEditor — a custom hook that owns the entire editing lifecycle: local

ArXiv Declares Independence from Cornell

<a href="https://news.ycombinator.com/item?id=47450478">Comments</a>

Full Disclosure: A Third (and Fourth) Azure Sign-In Log Bypass Found

<a href="https://news.ycombinator.com/item?id=47448994">Comments</a>

5 key capabilities of easy-model (with real-world context)

TL;DRModel-first architecture, not store-first.Instance caching by args for natural state partitioning.Deep change watching across nested objects.Hooks-friendly APIs for React.Built-in IoC/DI for explicit dependencies. The model-first shiftIf you’ve ever felt your domain logic getting scattered across actions, reducers, selectors, and side-effect layers, easy-model is a reset. It keeps state and behavior together in a class model, then exposes a small Hooks API for React. Example: shar

Compute Pressure API for System Resource Monitoring

Compute Pressure API for System Resource MonitoringIn the ever-evolving landscape of web development, performance optimization is crucial to delivering high-quality user experiences. To ensure applications remain responsive and efficient under various conditions, the Compute Pressure API emerges as a vital tool. This article provides a comprehensive exploration of the Compute Pressure API, from its historical context to advanced implementations, real-world use cases, and performance consid