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React `useActionState` in 2026: Replacing `useReducer` for Server-Driven Form Logic

React useActionState in 2026: Replacing useReducer for Server-Driven Form LogicThis article was written with the assistance of AI, under human supervision and review. Introduction: Why useActionState Matters in 2026Most form state management problems stem from mixing client-side validation logic with server response handling. Teams reach for useReducer to coordinate multiple state slices (pending, error, data), then wire up async dispatch patterns that duplicate server-side validation

Building a Production B2B Lead Enrichment & Scoring Agent in n8n for $0.008/Run

Every B2B software company hits the same operational roadblock: lead context bankruptcy.A prospect fills out a simple two-field demo form with [email protected] or [email protected]. Your sales reps or founders then spend 10 to 15 minutes checking LinkedIn, reading the company's landing page, trying to guess their tech stack, and looking up headcount before writing a personalized follow-up.At scale, this manual triage devours 10+ engineering and sales hours weekly. In this technical breakdown, we'll

Keeping a secret word secret in a realtime drawing game

A code-grounded look at server-held answers, narrow responses, and why a realtime room should not receive every private value.A realtime game has a deceptively simple privacy problem: every player needs the shared board, but not every player should receive the answer. If the server broadcasts one complete state object to the whole room, a player can inspect the network response or browser state and read information the interface tried to hide.In Boardit’s Draw and Guess implementation, the answe

I Ran the Same Overdue Invoice Through My Agent Twice. The Second Answer Surprised Me.

Same customer. Same ₹50,000 invoice. Same 12 days overdue. Run it through my payment-recovery agent with an empty memory, and it tells you to send an email reminder — which is exactly what every tool already does, and exactly what this customer has already ignored twice. Run it again after the agent has seen three prior recovery cycles for that customer, and it tells you something else entirely: skip the email, send WhatsApp, and schedule a follow-up call for day three, because that's the sequen

MongoDB's 16MB document limit: how to find the doc that kills your agent run

One of the agents I look after keeps its state in MongoDB, and a few weeks back it started doing the thing I dislike most: nothing. No stack trace, no failed HTTP call to point at. The run just sat there while the UI kept spinning.There was an error, all right. It wasn't in the app, it was in the database.A Mastra user hit the same wall in issue #21412. Long DurableAgent runs, MongoDB storage, workflow-snapshots collection. Their snapshot document grew past MongoDB's per-document size limit, the

How to Count Words and Characters in JavaScript Without a Library

Counting words and characters is a common feature in writing tools, form fields, blog editors, and social media applications.JavaScript makes it possible to build a simple text counter without installing any external libraries. In this tutorial, we'll create a word and character counter that updates as the user types.We'll also look at how spaces, line breaks, and emoji affect the results. 1. Create the HTMLStart with a textarea where users can enter their text. Below it, add three elements

The Collections Agent Stopped Guessing Once It Remembered

The Collections Agent Stopped Guessing Once It RememberedA wide banner shot: split-screen of the PayEcho dashboard on one side and a WhatsApp reminder thread on the other. This is the image most readers will see first in their feed, so make it look like a real product, not a slide.Priya runs collections for a mid-sized B2B services company. Her job, most days, is opening an overdue invoice, staring at a wall of past emails and call notes, and deciding: email again, call, escalate, or wait. The m

The Boring Backend Work That Made PayEcho's Memory Actually Reliable

Everyone wants to talk about the AI part. Nobody wants to talk about the part where an invoice update arrives twice because a webhook retried, and now the agent has “remembered” the same payment outcome three times. That's the part I owned, and it turns out it matters more than the prompt.PayEcho recommends how to recover an overdue invoice — which channel to use, when to follow up, whether a customer's history should factor into a new credit decision — by recalling what actually happened with t

How We Made an LLM Actually Use Recalled Memory

Integrating Hindsight into PayEcho took an afternoon. Getting the language model to actually use whatHindsight recalled — instead of politely acknowledging it and then giving the same generic adviceanyway — took most of the project. That gap between "the agent has access to memory" and "theagent's answer is visibly shaped by memory" is where almost all of the real engineering work lives, andit's the part most write-ups about agent projects skip past on their way to the demo.The Model I Almost Sh

How I Spent $80/Month and 14GB of RAM to Avoid Writing 10 Lines of Code

Let’s be brutally honest with ourselves for a second.As software developers, our greatest superpower isn't writing algorithms or fixing memory leaks. Our true superpower is spending 6 continuous hours engineering the most complex, over-engineered productivity setup in human history—just to avoid writing 10 lines of actual code. The Modern Developer "Productivity" StackHere was my daily workflow last month:Note-Taking App: Running on Electron. Consumes 2.4 GB of RAM to display raw text with

Cloud POS for Retail Shops in Bangladesh: What Changed in 2026

Ten years ago, running a shop meant a paper register — then a desktopbilling program installed on one PC that nobody dared touch after thefirst hard-disk failure.Cloud POS changed the equation: the software lives on the internet, sothe same sales, stock and reports follow you from the counter to yourphone. What a cloud POS actually replacesThe register → barcode checkout with cash, bKash and card in one flowThe stock notebook → inventory that updates the instant a sale, purchase or transfer

Programmatic SEO at Scale: Generating 1,000 High-Converting Pages Without Penalties

Programmatic SEO (pSEO) is one of the most potent distribution flywheels for technical SaaS products. By generating landing pages dynamically from structured datasets (such as competitor comparison matrices /compare/plyxo-vs-[competitor] or industry use-cases /solutions/crm-for-[industry]), you can capture thousands of high-intent long-tail search queries.However, 90% of programmatic SEO attempts fail catastrophically. Why? Because teams simply template out the same 500 words of generic copy, sw

"They had no concept of a duty of care to their users."

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In an $80 Motel Room, a Discovery to Shed Light on the Origins of Life

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Why hardcoded in-app announcements are technical debt in disguise

Every SaaS team starts the same way: a simple boolean column in PostgreSQL (has_seen_v2_modal), a useEffect hook, and a conditional modal component.Fast forward 6 months, and your frontend bundle is 80KB heavier with 14 dead announcement modals, 3 hydration race conditions, and marketing asking why the banner didn't trigger for trial users.Here is why hardcoding in-app experiences is an anti-pattern—and how to architect a deterministic, decoupled announcement engine in Next.js. The 3 Inevit

Child Components and Props in React

React applications are built using components. Components can be connected to each other, and one component can pass data to another component. What is a Child Component?A child component is a component that is rendered inside another component.The component that contains the child is called the parent component.For example:function BlogPost() { return &lt;h2&gt;Introduction to React&lt;/h2&gt;;}function App() { return ( &lt;div&gt; &lt;h1&gt;My Blog&lt;/h1&gt;

Replacing the old battery on rechargeable bike lights

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Fix "supabaseUrl is required" in Supabase JS

TL;DRcreateClient(supabaseUrl, supabaseKey) throws Error: supabaseUrl is required the moment supabaseUrl is an empty string, undefined, or whitespace — it is a synchronous check inside supabase-js, not a network error. In nearly every report the URL variable itself is fine in .env; it just never reached process.env (or import.meta.env) in the running app because of a missing prefix, a misnamed file, or a dev server that was never restarted after the file changed. Fix the naming convention

React virtualized chat: scroll anchoring & no-jump lists

Intro: the one‑pixel problemIf you build chat or live‑feed UIs in React, you've probably seen it: the viewport jumps when older messages are prepended, or when a streaming item grows while the user is pinned to the bottom. Those micro‑jumps are small but hugely damaging to perceived quality.This article captures a production‑tested, three‑step pattern I use to make React virtualized list scroll anchoring pixel‑perfect: stable keys → end‑anchored virtualizer → pre‑measure (measure‑then‑comm

Fix Cannot find module '@vitejs/plugin-react' in Vite

TL;DRCannot find module '@vitejs/plugin-react' or its corresponding type declarations (TS2307) in vite.config.ts has two distinct causes. When the package is missing or the editor's TypeScript server holds a stale view, install the package and restart the TS server. When tsc adds the line There are types at … but this result could not be resolved under your current 'moduleResolution' setting, the package is installed and your tsconfig.node.json still uses "moduleResolution": "Node", which