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Why Your useEffect Runs Twice in Development (And Why You Shouldn't "Fix" It)
This causes a very specific, very common reaction, a developer sees a console.log inside useEffect fire twice in the browser console during local development, assumes something's genuinely broken, and starts debugging a bug that doesn't actually exist. What's Actually Happening'use client';import { useEffect } from 'react';export function Tracker() { useEffect(() => { console.log('Effect ran'); // logs twice in development, once in production trackPageView(); }, []); return null
3 bugs that cost me 3 weeks building a form builder
I built a form builder (mini-Tally) as a side project.The code was the easy part. These three bugs cost me the most time. Bug 1 — Typing didn't workIn my form editor, typing in a question field did nothing. The letters just didn't appear.Cause: I used setBlocks(blocks.map(...)) — which captures stale state.Fix — use the functional form:typescriptsetBlocks((prev) => prev.map((b) => b.id === id ? { ...b, label } : b));Bug 2 — GitHub ate my src folderI dragged my project folder into Gi
Props in React
Props pass data from a parent component to a child component. Props are read-only — a child can't change them. Data flows one way: parent to child.function Greeting(props) { return <h1>Hello, {props.name}!</h1>;}<Greeting name="Ragul" /> SyntaxProps arrive as one object. You can destructure them for short code:function Profile({ name, age }) { return <p>{name}, {age}</p>;} CharacteristicsRead-only — a component can't change its own propsOne-way flow — pa
Best 22 Sites to Buy TikTok Accounts (New & Old)
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Designing a "Can My Dog Eat This?" Content Model: Verdict-First Pages, Structured Data and Safety Caveats
"Can my dog eat X?" is one of the most searched pet questions on the internet, and most answers bury the verdict under 1,500 words of filler. When I built Animals Details, a set of pet-owner guides covering dogs, cats, horses, food, health and other pets, I wanted the opposite: the answer first, then the nuance.This post is about the content model behind that — which turned out to be more of a data-modeling problem than a writing problem. The verdict is data, not proseEvery food-safety guid
CaptchaKit: A Self-Hosted CAPTCHA Package for React & Next.js + Try It Live
Adding CAPTCHA to a React or Next.js app usually means relying on an external service.It supports: • Text, number, math, and image CAPTCHAs • English and Persian (RTL) • Easy, medium, and hard difficulty • Light and dark themes • Server-side verification • HMAC-signed tokens • Expiration, one-time usage, attempt limits, and rate limitingThe goal was simple: add CAPTCHA protection without adding another external service to your stack.The full technical details a
Ollaya – Ollama for open-source, Jev-style decision models
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5 Key Points About JavaScript Functions
5 Key Points About JavaScript FunctionsReusable Blocks of CodeA function is a block of code designed to perform a specific task. Once defined, it can be called and reused throughout your application with different inputs.First-Class CitizensIn JavaScript, functions are treated as first-class objects. This means you can store them in variables, pass them as arguments to other functions (callbacks), and return them from other functions.Multiple Syntax OptionsJavaScript provides several ways
I Built an Economic Calendar From Government Sources Instead of Scraping ForexFactory
The most popular economic calendar actors on the Apify Store scrape ForexFactory or Investing.com. Their own docs tell the story: the calendar page blocks datacenter IPs, so you need residential proxies "at any meaningful volume," and a browser for anything past the current week.But every number on those calendars comes from somewhere. The jobs report comes from the Bureau of Labor Statistics. GDP comes from the Bureau of Economic Analysis. The Fed publishes its own meeting dates. So I built a c
Why EV Home Backup Fails: Solving Neutral-Ground Bonding Loops, NEC 250 GFCI Tripping, and V2L Inverter Math in TypeScript
Modern electric vehicles store between 60 kWh and 131 kWh of high-voltage electrochemical energy—the equivalent of 5 to 10 dedicated residential battery storage units (such as the 13.5 kWh Tesla Powerwall 2).During an extended electrical utility blackout or severe storm outage, an EV's traction battery can sustain essential household circuits (refrigeration, communications, LED lighting, furnace blowers, and medical devices) for 5 to 15 days continuously.However, software engineers, electricians
Top 07 Reliable Platforms to Buying Old Yahoo Accounts ...
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I asked Gemini for the simplest way to run Python in HTML. It took 4 tries, never named my tool, then admitted why.
I built a small library called Pytml — a ~15KB wrapper around Pyodide that lets you run Python in HTML with one script tag. print() and input() work out of the box. No config, no type="module", no body onload.Yesterday I asked Gemini the exact question Pytml exists to answer:"Is there a tool to run Python in the browser with no installation that I can embed in a static HTML page with one script tag?"What followed was a four-round conversation that ended with Gemini admitting why it never mention
10 Easy Ways to Buy Old Yahoo Accounts Smartly end Other...
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React useEffect Hook
What is useEffect?useEffect is a React Hook used to perform side effects in a component. A side effect is an operation that happens outside the normal React rendering process. Some common examples are using setInterval, adding an event listener, fetching data from an API, or changing the browser document title.The basic syntax of useEffect is:useEffect(() => { // side effect code}, []);The second parameter is called the dependency array. An empty array means the effect runs after the
Node.js 22.23.3 LTS fixes an HTTP/2 use-after-free bug
The Node.js project released Node.js 22.23.3 on September 23, 2026, a patch for its long-term support line. The most important change fixes an HTTP/2 use-after-free bug, a memory error in the code that handles HTTP/2 connections. Anyone serving HTTP/2 from Node.js 22 should plan the upgrade.Node.js is the runtime that lets JavaScript run on servers instead of only in the browser. Version 22 is a long-term support (LTS) release, which means it gets fixes for years and is what many companies run i
Today's Learning: JavaScript Basics:
Today's Learning: JavaScript Basics I am currently revising core JavaScript concepts and created a quick reference note! Here is a summary of the fundamentals 1. Data Types (Primitive):JavaScript has essential primitive data types to handle different kinds of values:NumberBigIntStringBooleanUndefinedNullSymbol 2. Anatomy of a Variable:Example: age = 25;age ➔ Variable= ➔ Assignment Operator25 ➔ Value 3. Variable Declarations (var, let, const):let: Used when declaring a variabl
Why We Built a 100% Client-Side QR Code Generator (No Paywalls, No Redirects)
We’ve all experienced it: you need a quick QR code for a client project, a restaurant menu, or Wi-Fi access. You search online, paste your link into a top-ranking "free" generator, print out your materials, and two weeks later... it stops working because it was a "14-day trial" dynamic link locked behind a $15/month subscription.Frustrated by tools that hold static data hostage or route private information through untrusted middleman servers, we built freeqrgen.uk—a fast, privacy-first QR code g
Stop Failing Mid-Level React Interviews: 5 Core Concepts Seniors Actually Look For
If you have 2–5 years of experience, interviewers aren't testing basic syntax. They want to know what happens beneath the hood.When interviewing for a mid-level frontend role (L4 / Mid-Senior), there is a distinct shift in what engineering panels look for.Junior interviews evaluate basic syntax: Can you build a counter? Can you consume a REST endpoint? Do you know how to pass props?Mid-level interviews evaluate predictability, execution models, and internals:⚬ Do you understand what happens duri
Understanding JavaScript Data Types: A Beginner's Guide
Today I started learning the basics of JavaScript. One of the topics covered in class was Data Types.Data types tell us what kind of value we are working with in JavaScript.What are Data Types?A data type defines the type of data stored in a variable.For example:let name = "Jeevish";let age = 21;let isStudent = true;Here:"name" is a String"age" is a Number"isStudent" is a BooleanTypes of JavaScript Data TypesStringA String is used to store text.let name = "Jeevish";NumberNumber is used to store
What Really Happens When You Press Enter? The Browser Rendering Pipeline Explained
A Senior Engineer's Guide to the Browser Rendering Pipeline (From DNS to Paint)Have you ever wondered what actually happens between the moment you hit Enter on a URL and when the first pixel lights up on your screen?Understanding this pipeline is the dividing line between junior developers who just write code and senior engineers who build ultra-fast, 60fps web applications.Let’s walk through the 5 crucial stages of the browser rendering pipeline. 1. The Network Journey: DNS, TCP, and
