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Why crypto CSV descriptions are not trades: extract candidates without inventing cost basis

An offline-first developer walkthrough · October 2026 · AI-assisted, reproducible examples.A historical question in r/koinly about Wealthsimple-style exports described an unusually awkward file format. Instead of separate columns for crypto amount and asset, a description can contain text resembling this:Description,When,Reference"Purchase of 1.4324467000 SOL","2026-10-01 10:00:00","FICTIONAL-01""Sale of 0.250000 BTC","2026-10-02 11:00:00","FICTIONAL-02""Purchase of 2 SOL for 99 CAD","2026-10-03

Your Files Never Leave the Browser: How Client-Side Tools Actually Work

Every "free online file converter" on the internet is secretly one of two different machines. They look identical in search results. Both have a drop zone, a progress bar, and a download button. But under the hood, one is a thin frontend for somebody's server — your file takes a trip, gets processed next to who-knows-what-else, and (if you're lucky) gets deleted "within 24 hours". The other kind is your own computer doing the work, wearing a website as a disguise.I run toolfyra, a toolkit built

Next.js 16.4 Is a Migration Release, Not a Version Bump

Next.js 16.4 made Cache Components the recommended path, switched them on by default for new create-next-app projects, and shipped next upgrade --agent so an AI agent can drive the upgrade for you. Bumping the version number takes a minute. Moving an existing app onto the new caching model is a migration, and nobody runs it for you, not even the agent.TL;DRExisting apps do not adopt the new caching model on their own. Upgrading the package and adopting Cache Components are two separate jobs, and

Setting up the stage for the calculator!

Ending the foundations stage, and keep moving forward!Before I even reached this last module, many modules way back, I already knew what I wanted to do with my calculator before I even got there! But, for that, I had to reach that point, without skipping the lessons, as it is important to understand everything. That is how the vision was planned in my mind from the start!The calculator itself was worth the challenge! Because it is not just about math, but also about bringing all the feelings, an

Retrying Failed API Requests: A Small Feature With Big Consequences

Retries are one of those backend techniques that seem straightforward.A request fails, so the application tries again. If the next request succeeds, the user never notices the temporary problem.But not every failed request should be retried automatically.I think this is an important distinction for anyone building reliable web applications.The problem with assuming a failure means nothing happenedImagine a frontend sends a request to create a payment or submit an order.The server processes the r

A Wallet Connection Is Not the Same as Transaction Approval

Connecting a crypto wallet to a Web3 application can feel like a routine first step.You click a button, approve a request, and the application recognizes your wallet.But from a development perspective, there's an important distinction: connecting a wallet does not automatically mean you've authorized every action the application might request later.I think this distinction deserves more attention, especially when designing interfaces for people who are new to Web3.Different requests have differe

I argued IoC was pointless in JavaScript, forgetting I'd published my own container to npm.

Why I built ioc-manifest: convention-based DI codegen for TypeScript and Awilix.Some weeks ago I had a job interview.We were chatting away — this is the tech stack we use, and this lib and that lib, and we use Awilix for IoC."Really," I said. "You use IoC?"Inversion of control. In JavaScript."Nobody uses IoC in JavaScript. What would you even use it for? You've got that delightful ES6 modules implementation that almost does some of what you wish it did. I mean, I get why you might want to use it

The 201st unit: modelling Pakistan's 2026 electricity slab tariff from a scanned SRO

Pakistan's household electricity tariff has a cliff in it. If a home stays at 200 units (kWh) or less in each of the last six months, it is billed as protected. Use 201 units once and the home is non-protected for the next six bills, even if usage drops again.I wanted to know what that one unit actually costs, so I modelled the tariff from the government notification and built a free calculator in Urdu around it. Disclosure: I built the tool linked at the end. This post is about the modelling, w

Create AI Voice Responses for Slack Bots

Why Voice‑Enabled Slack Bots MatterSlack is still the backbone of many teams’ communication, but most bots sit in the text realm. Imagine a bot that can speak to you, announce build statuses, read out meeting notes, or even clone your voice for a personal assistant. Voice responses bring a human touch, increase accessibility, and can make your bot feel more interactive.The key to adding voice is twofold:Convert a Slack message (or a bot’s reply) to speech – Text‑to‑Speech (TTS).Optionally

Build a Voice Cloning Demo App

Why Voice Cloning Matters (and Why It’s Easier Than Ever)If you’ve ever wanted to give your app a “personal” voice—whether it’s a virtual assistant, an audiobook reader, or a game character—voice cloning is the secret sauce. Modern text‑to‑speech (TTS) platforms can take a few minutes of recorded audio and generate a synthetic voice that sounds almost indistinguishable from the real thing. The result? Faster content creation, more engaging user experiences, and the ability to prototype ide

One parser, three readers: how our Next.js blog serves browsers, search engines, and Medium's importer

A post on our blog gets read by at least three kinds of client. People read it in a browser. Search crawlers want the text in the HTML, plus some structured data. And Medium's import tool, which we use to syndicate posts, fetches the page remotely and has to find the images by itself.We're building MotionLab, personalized stretching and mobility sessions. Earlier posts in this series covered our AI session builder, our Postgres push queue, and billing. This one is about the blog. Posts are store

How I Built an AI-Powered Observability Platform to Stop Digging Through Microservices Logs 🚀

Ever spent three hours tracing a single NullPointerException across five different microservices? You grep through endless terminal windows, match timestamps, and manually piece together the puzzle. It’s exhausting.As a full-stack developer working heavily with Spring Boot, I realized that while microservices solve scalability issues, they introduce a massive debugging headache. I wanted a tool that didn't just show me the logs, but actually helped me fix them in real-time. Since I couldn't find

React Form Components: Accessible Fields, Zod and Mobile

TL;DRGood React form components share one anatomy: a label tied to the control, one message row that shows the hint or the error, and a counter when there is a limit, with the ids and aria attributes wired for you. Connect them to react-hook-form with register for native inputs and Controller for everything else, and validate with one zod schema once a field has been left. On phones, every control needs 16px text, the right keypad, 44px targets and a bottom sheet instead of a popover.Every

Your SVG Icon Migration Worked. So Why Are Some Icons Missing?

Your SVG files are valid. Your toolbar icons look fine. But some dropdown menus are suddenly missing their icons. Here's why that happens—and how to catch it before release.Migrating from CSS sprites to SVG icons sounds straightforward.You replace the old assets, update the components, check that the new icons render, and move on.Everything looks fine until someone opens a dropdown menu.The toolbar icons are there. The menu labels are visible. The actions still work. But the icons inside the men

How I Built an Autonomous Website Audit & Discovery Tool with FastAPI, React 19 & Google Gemini

Cold outreach in 2026 is broken. Business owners get flooded every day with generic template spam like "Hey, I noticed your website could use an upgrade..."—with zero proof and zero personalization.I spent the last month building an open-source alternative: Leddro 🚀Instead of spamming businesses, Leddro discovers authentic local businesses, runs deep server-side diagnostics (DNS, TLS/SSL, TTFB speed, mobile responsiveness), and drafts fact-checked proposals that cite authentic audit findings.

Which Business Directories Matter in Each Country? Comparing Markets From One Edge-Cached Endpoint

If you build anything for local businesses, sooner or later someone asks which directories they should be listed on. The honest answer is "it depends on the country and the industry", and that answer is only useful if you can put numbers on it. This post shows a 40-line Node.js script that compares five markets through one public JSON endpoint, the output it produced on October 20, 2026, and two things we learned building the endpoint: why the raw ranking needed a relevance filter, and how edge

How I shipped a Nadi (BNN) astrology calculator as one 200 KB HTML file

A working Vedic astrology tool that computes planetary positions, finds Nadi bonds and projects slow-planet progression across a lifetime — with no build step, no npm, no server and no network calls.Here is what that constraint forced me to do, and the one bug that cost me the most time. The constraintThe tool had to run from a single file, opened straight from disk, on a phone, with no internet. That rules out:a CDN for the ephemerisa bundlera server to do the astronomya timezone APIEveryt

I built a single-file CLI that compiles a folder into a valid EPUB 3

Around February last year, that was also when I started my career as a writer. I made a Light Novel and published it on Google Play Books, and at the time I built it directly in .EPUB format using an Android app called ZisE. The app was simple enough for making EPUBs, but the annoying part was the tons of ads and how it forced you to go premium if you tried to bypass them by turning on airplane mode.Eventually I got fed up with the app, so I asked DeepSeek to build a web app called epubCreator t

Angular 22.2 Explained: Router Resources, Error Boundaries, and Private Template Access

Three developer-preview features that quietly change how you load data, isolate failures, and structure componentsHave you ever opened a page and watched it flicker through an empty state, a spinner, and finally real data, all because the component had to manage its own loading? Angular 22.2 gives us a cleaner way to handle this with router resources, and it ships two other changes worth knowing.Since Angular now ships only one major release per year, the minors carry real weight. This one

I built a tool to fix cryptic terminal & console errors in 1 click

Debugging errors like TypeError: Cannot read properties of undefined or ModuleNotFoundError: No module named 'requests' wastes countless hours every week. Copy-pasting errors into a browser tab breaks your flow.I built FixTrace AI to solve this right where you already work: 1. In Visual Studio CodeTerminal Error Sniffing: Automatically detects and underlines Python tracebacks, Node.js uncaught exceptions, and Go panics in your integrated terminal with interactive 1-click links.Editor Quick-