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Build a custom HLS player in React with hls.js (no wrapper libraries)

TL;DRWe'll build a custom HLS player on top of hls.js 1.6.x and React 19 with no wrapper library. Play/pause, seek, volume, quality readout, buffer state, and proper error recovery. End result is ~150 lines and bends to whatever UI you want.📦 Code: github.com/USER/react-hls-player-demo (replace before publishing)This is the "stop installing video.js for the third time" tutorial. The wrapper libraries are doing two things you need (the MSE shim and the error-recovery loop) and a lot of thin

Permission-Based Routing in React Micro Frontend

A support agent logs into your seller portal. They type a URL:myapp.com/earningsAnd the entire Earnings micro frontend loads. Payouts, transactions, the lot — for a user who should only ever see the Support module.Here's why it happens. In a federated host, every remote is mounted by a route:<Route path="earnings/*" element={<EarningsMFE />} /><Route path="orders/*" element={<OrdersMFE />} /><Route path="reports/*" element={<ReportsMFE />} />That <

Stop your app from booting with broken env vars: a type-safe, universal config library

TL;DR — process.env.PORT is a string | undefined, your bundler silently inlines client env at build time, and every runtime exposes env differently. @teispace/env is a zero-dependency library that loads, validates, coerces, and types your environment once and works the same on Node, Bun, Deno, Cloudflare Workers, Next.js, NestJS, Vite, Nuxt, Astro, and SvelteKit. Bring Zod/Valibot/ArkType, or use the built-in coercers. npm i @teispace/env.import { defineEnv, e } from '@teispace/env';export const

Merge Financial Reports Automatically: A Real-World csv-toolkit Workflow

Merge Financial Reports Automatically: A Real-World csv-toolkit WorkflowA real example of processing monthly financial reports. The SetupYou have 12 monthly CSV reports that need to be merged and analyzed. Step 1: Mergecsv-toolkit-pro merge ./reports/*.csv --on "account_id" -o merged.csv Step 2: Cleancsv-toolkit-pro clean merged.csv --remove-empty --fill-missing 0 -o clean.csv Step 3: Analyzecsv-toolkit-pro analyze clean.csv --group-by "department" --agg "sum:revenue"

Automate Your File Organization with One Command Every Day

Automate Your File Organization with One Command Every DayStop manually organizing files. One command does it all. The ProblemDownloads folder with 500+ unsorted files. Screenshots, PDFs, CSVs, images — all mixed together. The Solutionfile-batch-toolkit organize ~/Downloads --by-type# Creates: Images/, Documents/, Data/, Archives/ Custom Rulesfile-batch-toolkit organize ~/Downloads --rules my_rules.json{ "invoice_*.pdf": "Invoices/", "report_*.csv": "Reports/", "IMG_*": "

How I Stopped Node.js from Freezing While Bulk-Processing 1,500+ Excel Rows

I was building a virtual attendance tracking system for a university. The client requested a feature we’ve all built a hundred times: "Allow admins to upload an Excel file to bulk-import students."Easy, right? I set up multer, grabbed the file buffer, parsed it, looped over the rows, and inserted them into Postgres. Locally, with a dummy file of 5 rows, it was blazingly fast. We shipped it to production.The next day, an admin uploaded a real-world file containing 1,500 students. The server choke

Review my Portfolio - MahilanJP

<p>HEllO Everyone, <br> Visit my own portfolio and give me some review about it <br> Url : <a href="https://mahilanjayaprakash.com/" rel="noopener noreferrer">https://mahilanjayaprakash.com/</a> Feel Free to copy anything from my code</p>

Here is the Canonical Title

3 AI Tools That Saved Us 20 Hours/WeekWe tested 15 AI tools across our agency. Only 3 delivered real, measurable time savings.Make.com — automated 4 manual data entry steps, saved 6 hours/week per team member. Zero errors since deployment.Claude for Research — summarizes 50-page reports into actionable briefs in under 2 minutes.Custom GPT for Onboarding — qualification form to proposal draft in 8 minutes flat. What used to take 45 min now takes 8.Full breakdown with setup guides: https://dg10.ag

Building a Zero-Dependency Body Fat Calculator: The Math, the Navy Formula, and 100% Client-Side JS

Designing for PerformanceI chose a lightweight static setup using Astro and Tailwind CSS. Since all mathematical operations happen locally on the user's browser, there is zero server overhead and absolute privacy—no user data ever leaves their machine. The page achieves a 100/100 performance score on Lighthouse, loads in under 200ms, and updates results instantly on keypress.What do you think of this approach? I'd love to get your feedback on the UI and the unit-conversion logic!

I Didn’t Become a Developer to Review AI Slop: The True Cost of "Almost Right" PRs

The barrier to writing code has completely vanished with modern AI agents spinning up massive repository branches from a single prompt, but engineering teams are quickly realizing that writing lines of code and building scalable, trustworthy architecture are two entirely different things. Recent industry data shows that AI-generated pull requests sit waiting for review over four times longer and face massive rejection rates because while automated tools are brilliant at quick syntax, they are te

The Most Expensive Business Problem Nobody Measures: How Operational Friction Silently Kills Growth in the AI Era

Introduction: The Metric Nobody SeesEvery executive dashboard looks impressive.Revenue growth is tracked.Website traffic is monitored.Marketing-qualified leads are measured.Conversion rates are analyzed.Customer acquisition costs are optimized.Yet despite all this data, many organizations still struggle to scale.Why?Because the most expensive business problem rarely appears in analytics reports.It is not listed in financial statements.It is not discussed during quarterly reviews.And most o

React.js ~use() hook Rules and Gotchas~

use() can be called conditionallyUnlike every other hook, use() works inside if, for, and after early returns. React's linter is aware of this exception.use() cannot be called in try-catchRejected promises are caught by Error Boundaries, not by try-catch blocks. If you wap use() in a try-catch, React throws a "Suspense Exception" error.// This will crashtry { const data = use(promise);} catch (e) { // Never reaches here}If you need to provide a fallback value for a rejected promise, use .catch

Building a Lightweight Observability Toolkit for Small Teams

Building a Lightweight Observability Toolkit for Small Teams Building a Lightweight Observability Toolkit for Small TeamsObservability isn’t just for massive systems with dedicated SREs. Even small development teams can gain dramatically by stitching together a practical, opinionated toolkit that helps you diagnose issues quickly, improve reliability, and ship with confidence. This guide walks you through a lean, end-to-end observability setup you can implement in a week-without overh

I built a visual README editor so developers never have to write markdown from scratch again

Every developer knows the feeling — you finish a project, push it to GitHub, and then stare at the empty README.md wondering where to even start.So I built ReadmeForge. A block-based visual editor where you drag, drop, fill in content, and download a perfect README in minutes.What it does:You get 11 purpose-built blocks — title, badges, description, features, installation, usage, screenshots, API docs, contributing guide, license, and custom markdown. Drag them to reorder, fill in your content,

How to handle imposter syndrome as a developer: practical strategies

How to handle imposter syndrome as a developer: practical strategiesImposter syndrome is the nagging feeling that you don’t really belong, you’re “one mistake away” from being exposed, and your success must be luck rather than skill. In tech, it often shows up as the belief that other developers are naturally better, while you’re only keeping up through effort, not talent. That contrast-“they’re competent by default, I’m faking it”-is the core loop.It helps to know that imposter syndrome i

June Is For Exploring (2026 Wallpapers Edition)

Everyone has a creative spark in them. Some bring their ideas to life with digital tools, others capture the perfect moment with a camera or love to grab pen and paper to create little doodles or pieces of lettering. And even if you don’t think of yourself as particularly creative, who knows? There might be a hidden talent waiting to be discovered!That’s exactly what our monthly wallpapers series has been all about for over 15 years now. It’s a chance to step away from the everyday and dive into

How to build a personal portfolio that gets you hired: a developer guide

How to build a personal portfolio that gets you hired: a developer guideCrafting an effective software engineering portfolio is about translating your hands-on work into a story that recruiters and hiring managers can quickly understand. Below is a practical guide you can follow, plus concrete examples of how to present projects, write about your work, and build a personal site that travels well across roles and seniorities.1) Define the portfolio’s goal and audienceIdentify target roles:

Building a Browser-Based Focus Timer with Web Audio API and Picture-in-Picture

I built Pomoria, a browser-based focus timer that combines custom work and break sequences, ambient sound generation, notes, and Picture-in-Picture.At first glance, it may look like another Pomodoro timer. But the part I found most interesting was not the countdown itself. It was building a small focus environment directly inside the browser.Most Pomodoro apps are based on a fixed 25/5 loop. That works for some tasks, but not for everything. Studying for an exam, writing, coding, or reviewing a

London's Free Roof Terraces

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The Website Specification

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