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PWA with React + Leaflet: lessons from a 31-city map app

Notes from shipping a real-world PWA in Korea:Vite SSG is worth it. SPAs lose Korean SEO because Naver's crawler doesn't fully render JS.Leaflet > Mapbox for cost-sensitive projects. Free OSM tiles + zero cost.Firebase Hosting rewrites let you have deep URLs (/city/suwon) without a backend.KakaoTalk share is non-negotiable in Korea — 70%+ of social traffic.PWA install banner: don't auto-prompt, let the user discover.Project: https://gyeonggi-currency-map.web.app?ref=devto&utm_source=devto

TypeScript Email Fixtures Need One Owner

Email verification tests often fail for a reason that has nothing to do with React. The browser creates one address, the API helper stores another, and the cleanup step guesses which inbox should be deleted. The assertions look reasonable in isolation, but the whole test is carrying three slightly different stories.I have found that the simplest fix is to give the email fixture one owner. A typed object creates the address, exposes the identifiers that the UI and API need, and owns cleanup. This

U.S. postal inspectors shut down website selling counterfeit postage labels

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Show HN: TurboGPT: train 22KiB transformer in 13s

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5 React Admin Dashboard Templates Worth Checking in 2026

Choosing a React admin dashboard template looks easy until you start comparing architecture, framework versions, component quality, routing, state management, responsiveness, and long-term maintainability.A polished demo is not enough.If you're building a SaaS dashboard, CRM, analytics platform, internal tool, or admin panel in 2026, here are five React admin templates worth looking at. 1. Adminex — React 19 Admin DashboardAdminex is built with:React 19TypeScriptViteTailwind CSS 4Chart.jsIt

Nicholas Polson has authored 258 academic papers in 2026 (so far)

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TypeScript `using` in Real Codebases: Database Connections, File Handles, and Async Disposal Done Right

TypeScript using in Real Codebases: Database Connections, File Handles, and Async Disposal Done RightThis article was written with the assistance of AI, under human supervision and review.Most resource leak bugs stem from a single assumption: developers remember to close what they open. Production codebases overflow with database connections held open by early returns, file handles left dangling after exceptions, and transaction scopes rolled back inconsistently because the cleanup logic s

See which bots and AI crawlers are visiting your React site

A crawler can request your React site's HTML without ever running React. If you only look at browser analytics, you can miss those requests entirely.This tutorial uses WebDecoy to observe requests to a React application served by Express. It starts in monitor mode, so you can inspect detections before choosing whether to block anything. We build WebDecoy; this example uses its Express SDK and cloud dashboard. Start with where your React site is hostedReact renders your interface. The server

Rust Git Client UI Rewrite: Switching from Tauri/React to Iced for Improved Performance and Linux Support

IntroductionThe journey to rewrite the UI of a Rust-based git client from Tauri+React to Iced began with a confluence of technical frustrations and a growing desire for unification. Initially, the project leveraged Tauri for its backend and React for the frontend, a common hybrid approach. However, this setup introduced friction points that became increasingly untenable. The primary catalyst was the window pane management in Tauri, which lacked the flexibility required for complex UI inter

JS variables , Functions &Objects

Variableslet-- a keyword used to declare re-assignable, block-scoped local variables.var-- re- declaring the values.const-- you can't change the values.Complier -- debug your whole program and translate to the machineIntrepreter -- line by line debug and translates them to the machine.FunctionThe function name should starts with lowercase, declaring the function and calling it (invoking) a reusable block of code designed to perform a specific task.eg: function subj(tam, eng, math, sci, ss){

Why Point-in-Time Prompts Failed Our Patients Until I Added Hindsight

If a patient reports a pain score of 6 out of 10 on their third morning post-knee replacement, should their surgical team be worried?If you ask an LLM in a stateless prompt containing only that morning's intake form, it will give you a generic, hedged answer. It might suggest resting, icing the joint, and taking paracetamol. But in surgical recovery, a pain score of 6 is completely meaningless in isolation.If that patient was an 8 yesterday and a 9 on Day 1, a 6 is great news. The acute inflamma

Components in React

React is a JavaScript library used to build user interfaces for web applications. One of the most important concepts in React is the component. A component is a small, reusable part of a user interface. Instead of creating an entire application in one large file, React allows developers to divide the application into smaller components.For example, a website can contain a Navbar, Sidebar, Button, Product Card, Login Form, and Footer. Each of these can be created as a separate component. These co

Telegram:(@arven_knox) Buy Coke,Weed,MDMA,Meth,Cannabis,Cocaine in New Jersey .

<p>Telegram:(@arven_knox) Buy Coke,Weed,MDMA,Meth,Cannabis,Cocaine in New Jersey </p>

Day 11: Learning JavaScript Objects & Constructors 🚀

1.ObjectsToday i continued learning Javascript and learned about Objects,Object properties,constructors.An object is used to store related data using key-value pairs``javascriptlet student = { name: "Saravanan", age: 33, course: "JavaScript"};console.log(student);` 2.Reassigning a propertyWe can change the value of an object's property`student.age = 34;console.log(student.age);` 3.ConstructorA constructor function can be used to create multiple objects with the same str

I built a 3D system design simulator to stop hand-waving architectures

I built a 3D system design simulator to stop hand-waving architecturesSystem design interviews and architecture reviews share a problem: we draw boxes and arrows on a whiteboard and assert things like "the cache absorbs most of this" or "we'll just auto-scale." Nobody checks. I wanted a toy where you can actually watch those claims break — so I built one.Give it a try at https://system-design-simulator-navy.vercel.app/ What it isSystem Design 3D Simulator is a web app: you compose inf

Building, Debugging, and Testing RecallDesk: What We Learned While Connecting Persistent AI Memory to a Support Workflow

Building, Debugging, and Testing RecallDesk: What We Learned While Connecting Persistent AI Memory to a Support WorkflowBy T ManiVardhan — RecallDesk Engineering TeamWhen building AI-assisted developer tools, the hardest engineering challenges rarely lie in prompt crafting. They emerge in the seams between systems: where a reactive frontend expects instant responsiveness, an asynchronous backend coordinates multi-step state transitions, and an external persistent memory engine indexes tech

Tcl/Tk 9.1

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Build a CRUD app with a JavaScript grid, Node and DynamoDB. Part 1: read the data

This is the dev.to edition of a tutorial that lives, with a live copy of the finished grid you can try, at latticegrid.dev/tutorials/crud-dynamodb-part-1.This is the first of a short series that builds a working application fromnothing: a DynamoDB table, a Node Lambda function in front of it, and a webpage that shows the data in a grid. Part 1 ends with a page that readsproducts from your own AWS account. Later parts add creating, editing anddeleting rows.It is deliberately basic. Everything is

Dots: Always-on agents

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GPT 6.1 Sol: Near-Astra intelligence for a fifth of the price

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