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Ashish Kumar

Senior frontend engineer writing about React internals, browser performance, and how big tech builds things. renderlog.in

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Network Optimization in React SPAs: Prefetching
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Network Optimization in React SPAs: Prefetching

#performance #network #react #caching
3
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9 min read

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DOM Performance on Mobile: Lab vs Real Device Reality
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DOM Performance on Mobile: Lab vs Real Device Reality

#performance #mobile #dom #css
3
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9 min read
React Re-rendering: When and Why Component Trees Update
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React Re-rendering: When and Why Component Trees Update

#react #performance #rendering #reconciliation
2
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9 min read
OCR in the Browser: How Tesseract.js Makes PDF Text Extraction Free
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OCR in the Browser: How Tesseract.js Makes PDF Text Extraction Free

#javascript #webdev #machinelearning #productivity
2
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7 min read
Why Client-Side PDF Tools Beat Server Uploads (Privacy, Speed, and Cost)
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Why Client-Side PDF Tools Beat Server Uploads (Privacy, Speed, and Cost)

#webdev #privacy #javascript #performance
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7 min read
A Developer's Guide to Image Formats: JPG, PNG, WebP, AVIF, and HEIC
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A Developer's Guide to Image Formats: JPG, PNG, WebP, AVIF, and HEIC

#webdev #performance #frontend #productivity
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6 min read
Building Slugs That Don't Break: Unicode, Diacritics, and Edge Cases
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Building Slugs That Don't Break: Unicode, Diacritics, and Edge Cases

#webdev #javascript #seo #productivity
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6 min read
Building Offline-First Web Apps with localStorage: A Practical Guide
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Building Offline-First Web Apps with localStorage: A Practical Guide

#javascript #webdev #productivity #frontend
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7 min read
The WiFi QR Code Format Decoded: Build One Yourself in 30 Lines
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The WiFi QR Code Format Decoded: Build One Yourself in 30 Lines

#javascript #webdev #networking #productivity
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7 min read
Naming Things: When to Use camelCase, snake_case, kebab-case, and PascalCase
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Naming Things: When to Use camelCase, snake_case, kebab-case, and PascalCase

#javascript #webdev #programming #productivity
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6 min read
JSONPath Cheat Sheet: Querying Nested JSON Without Lodash
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JSONPath Cheat Sheet: Querying Nested JSON Without Lodash

#json #javascript #webdev #productivity
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6 min read
What's Actually Inside a JWT? A Visual Walk-Through
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What's Actually Inside a JWT? A Visual Walk-Through

#security #javascript #webdev #authentication
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7 min read
From JSON to TypeScript: Five Ways to Stop Hand-Writing Interfaces
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From JSON to TypeScript: Five Ways to Stop Hand-Writing Interfaces

#typescript #javascript #webdev #productivity
1
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8 min read
React.memo, useMemo, useCallback: When They Help vs Hurt
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React.memo, useMemo, useCallback: When They Help vs Hurt

#react #performance #usememo #usecallback
1
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7 min read
React Concurrent Features: Urgent vs Deferred UI Updates
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React Concurrent Features: Urgent vs Deferred UI Updates

#react #performance #concurrent #starttransition
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7 min read
React List Virtualization: Pagination vs Virtual Scroll
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React List Virtualization: Pagination vs Virtual Scroll

#performance #react #virtualization #lists
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8 min read
Lottie: How Airbnb Replaced GIFs with JSON Animation
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Lottie: How Airbnb Replaced GIFs with JSON Animation

#lottie #animation #frontend #mobile
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2 min read
JSON.stringify() Does Some Things You Probably Don't Expect
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JSON.stringify() Does Some Things You Probably Don't Expect

#javascript #json #debugging #webdev
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3 min read
Stop Writing TypeScript Interfaces by Hand for API Responses
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Stop Writing TypeScript Interfaces by Hand for API Responses

#typescript #javascript #webdev #tutorial
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3 min read
JSONPath: The Practical Guide to Querying Nested JSON Without Writing Loops
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JSONPath: The Practical Guide to Querying Nested JSON Without Writing Loops

#javascript #json #tutorial #webdev
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3 min read
JSON.parse() Errors: What Each Message Actually Means
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JSON.parse() Errors: What Each Message Actually Means

#javascript #json #debugging #performance
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8 min read
Long Tasks and Main Thread Blocking: Breaking Up the Work
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Long Tasks and Main Thread Blocking: Breaking Up the Work

#performance #javascript #longtasks #inp
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8 min read
How Aadhaar Deduplicates Biometrics at Billion Scale
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How Aadhaar Deduplicates Biometrics at Billion Scale

#aadhaar #identity #scale #engineering
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3 min read
Why Rapido Uses a Static PIN (Rapid OTP Trade-offs)
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Why Rapido Uses a Static PIN (Rapid OTP Trade-offs)

#ux #product #security #engineering
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3 min read
Meta StyleX: Moving CSS-in-JS From Runtime to Build Time
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Meta StyleX: Moving CSS-in-JS From Runtime to Build Time

#stylex #css #frontend #javascript
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3 min read
DRM PiP Loophole: Why Picture-in-Picture Can Bypass DRM Black-Screen Protection
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DRM PiP Loophole: Why Picture-in-Picture Can Bypass DRM Black-Screen Protection

#drm #widevine #streaming #webplatform
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3 min read
Core Web Vitals and Lighthouse: What the Scores Mean
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Core Web Vitals and Lighthouse: What the Scores Mean

#performance #corewebvitals #lighthouse #lcp
1
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9 min read
Why React Error Boundaries Are Still Class Components
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Why React Error Boundaries Are Still Class Components

#react #javascript #frontend #errors
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4 min read
React State Management Compared: Redux vs Zustand vs Jotai vs Valtio
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React State Management Compared: Redux vs Zustand vs Jotai vs Valtio

#react #statemanagement #javascript #frontend
1
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4 min read
How Google Maps Predicts Traffic in Real Time: Live Data and ETA Explained
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How Google Maps Predicts Traffic in Real Time: Live Data and ETA Explained

#googlemaps #traffic #gps #dataengineering
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3 min read
The 16.6ms Frame Budget: Why Fast Loads Still Feel Slow
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The 16.6ms Frame Budget: Why Fast Loads Still Feel Slow

#performance #javascript #frontend #rendering
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3 min read
Why CSS Never Matches Figma: Browser vs Canvas Pipelines
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Why CSS Never Matches Figma: Browser vs Canvas Pipelines

#figma #css #designhandoff #frontend
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5 min read
DRM Explained: Why JioHotstar Goes Black When You Screen Share
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DRM Explained: Why JioHotstar Goes Black When You Screen Share

#drm #streaming #webplatform #security
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3 min read
Browser Rendering Pipeline: How JS and CSS Become Pixels
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Browser Rendering Pipeline: How JS and CSS Become Pixels

#performance #browser #rendering #javascript
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9 min read
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