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WOWHOW FIELD NOTES · № 074THU, MAY 21, 2026 · PUNE ISTSHIPPED WEEKLY · 7:00 AM

Field Notes for builders
who actually ship.

No listicles. No AI slop. Every post comes from code we deployed, bills we paid, and customers who complained. Written by the founder and two contributors — nobody else.

Articles published

288

Free tools

Products reviewed

1,960

Avg read time

8 min

Featured · Developer Productivity/16 min read/19h ago

Web Scraping with Node.js: Puppeteer vs Cheerio (Complete 2026 Guide)

Puppeteer controls a real browser. Cheerio parses raw HTML. Knowing when to reach for each tool — and how to combine them — is the difference between a scraper that works once and one that runs in production.

Anup Karanjkar

Founder · WOWHOW

Published

May 21, 2026

Read time

16 min

Stack

Nodejs · Web Scraping · Puppeteer

Read the full note

WOWHOW / DEVELOPER PRODUCTIVITY19h ago

Puppeteer controls a real browser

⚡ 16 min— AK

We only write about what we deployed.We only link to what we bought.We name names when something sucks.

19 notes

Developer Productivity18 min

SQL Performance: Indexing, Query Tuning & Explain Plans (Developer Guide)

A missing index on a foreign key column. A subquery inside a WHERE clause executed once per row. An ORM silently firing N+1 queries. These patterns destroy SQL performance at scale — and every one is fixable once you know what to look for.

AKAnup Karanjkar

19h ago

Developer Productivity15 min

GitHub Actions CI/CD: Build a Complete Node.js Pipeline (2026)

GitHub Actions is the CI/CD platform most Node.js teams end up on. This is the complete setup — from a basic test runner to a multi-environment Docker pipeline with zero-downtime deploys and rollback.

AKAnup Karanjkar

19h ago

Developer Productivity16 min

Zod Validation: Type-Safe APIs & Forms in TypeScript (Complete Guide)

Zod solves a problem that TypeScript alone cannot: your types are a compile-time fiction if you never validate the data that enters your system at runtime. This guide covers every Zod pattern you will use in real production code.

AKAnup Karanjkar

19h ago

Developer Productivity14 min

Next.js 16 API Routes & Middleware: Build Production APIs (2026 Tutorial)

Next.js 16 rewrote how route handlers and middleware work. This tutorial covers real production patterns: typed route handlers, chained middleware, token-bucket rate limiting, and auth guards — with 8 working TypeScript examples.

AKAnup Karanjkar

19h ago

Developer Productivity16 min

TypeScript Utility Types: 15 Advanced Patterns Every Developer Needs

TypeScript ships 20+ built-in utility types — but most developers only use Partial and Required. This guide covers 15 patterns that will eliminate entire categories of runtime errors from your codebase.

AKAnup Karanjkar

19h ago

Developer Productivity15 min

React 19 Server Components: 7 Data Fetching Patterns That Replace useEffect

useEffect for data fetching is an anti-pattern in React 19. Server Components, async components, cache(), use(), and Suspense streaming handle every fetch scenario with less code and better performance.

AKAnup Karanjkar

19h ago

Developer Productivity13 min

Build a CLI Tool with Node.js & TypeScript in 30 Minutes

A complete guide to building a production-quality CLI tool with Node.js and TypeScript. Covers Commander.js, Inquirer prompts, Ora spinners, Chalk colors, file operations, binary entry points, and publishing to npm.

AKAnup Karanjkar

19h ago

Developer Productivity14 min

Tailwind CSS v4 Migration Guide: Everything That Changed in 2026

Tailwind CSS v4 ditched tailwind.config.js entirely. Configuration is now CSS-first via @theme. The color system, variants, and plugin API all changed. This migration guide covers every breaking change with before/after code.

AKAnup Karanjkar

19h ago

Developer Productivity9 min

Free JSON Formatter & Validator: Developer's Complete Guide 2026

Malformed JSON is responsible for more API debugging sessions than almost any other cause. A trailing comma, an unescaped quote, a missing bracket — and your entire payload silently fails. Here is everything developers need to know about JSON formatting and validation in 2026.

AKAnup Karanjkar

19h ago

Developer Productivity10 min

JWT Decoder & Debugger: How JSON Web Tokens Work in 2026

JSON Web Tokens are in virtually every modern web application — but most developers who use them daily have never read the RFC. Understanding what the three parts actually contain, and why the signature matters, is the difference between secure auth and a textbook vulnerability.

AKAnup Karanjkar

19h ago

Developer Productivity9 min

Color Contrast Checker for WCAG 2.2: Accessibility Compliance Guide 2026

WCAG 2.2 changed the accessibility rules — and most UIs are still failing. Here is everything you need to know about contrast ratios, the new criteria, and how to check compliance before your next deployment.

AKAnup Karanjkar

19h ago

Developer Productivity8 min

Free Invoice Generator Online: Create Professional Invoices in 60 Seconds

Creating an invoice should take 60 seconds, not 20 minutes. Here is how to use a free online invoice generator to create professional, GST-compliant invoices instantly — and the key fields every invoice must include to get paid faster.

AKAnup Karanjkar

19h ago

Monday memo · Free

One note, every Monday. 7am IST. Zero fluff.

1 field report, 3 links we stole ideas from, and 1 product we actually bought. Read by 11,200+ builders.

11,200+ subscribers·47% open rate·No spam, ever

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Field Notes for builderswho actually ship.

Web Scraping with Node.js: Puppeteer vs Cheerio (Complete 2026 Guide)

SQL Performance: Indexing, Query Tuning & Explain Plans (Developer Guide)

GitHub Actions CI/CD: Build a Complete Node.js Pipeline (2026)

Zod Validation: Type-Safe APIs & Forms in TypeScript (Complete Guide)

Next.js 16 API Routes & Middleware: Build Production APIs (2026 Tutorial)

TypeScript Utility Types: 15 Advanced Patterns Every Developer Needs

React 19 Server Components: 7 Data Fetching Patterns That Replace useEffect

Build a CLI Tool with Node.js & TypeScript in 30 Minutes

Tailwind CSS v4 Migration Guide: Everything That Changed in 2026

Free JSON Formatter & Validator: Developer's Complete Guide 2026

JWT Decoder & Debugger: How JSON Web Tokens Work in 2026

Color Contrast Checker for WCAG 2.2: Accessibility Compliance Guide 2026

Free Invoice Generator Online: Create Professional Invoices in 60 Seconds

One note, every Monday. 7am IST. Zero fluff.

Need production-ready templates?

Field Notes for builders
who actually ship.