An upload looks like a one-liner — a file input, a POST, done. Then someone uploads a two-gigabyte video on hotel wifi and the whole illusion collapses. The hard part was never the input. It's moving a large, unreliable blob of bytes from a browser to somewhere it can live. Here's how I actually handle it.
Dates look like the most boring data type in your app. They are also the source of the subtlest, most embarrassing bugs — the meeting that shows an hour off, the 'today' that's tomorrow in Tokyo, the date that shifts a day every time you save it. Here's how I stop time from quietly breaking a React app.
Taking a payment looks like a form submission and is nothing like one. The card number is radioactive, the confirmation is asynchronous, and the one thing your React app must never do is believe it got paid because a callback said so. Here's where the real line sits between the browser, your server, and Stripe.
Everyone thinks i18n means swapping English strings for a dictionary lookup. That's the 10% that's easy. The 90% is formatting, pluralization, text that changes direction, and language data you can't afford to ship all at once. Here's what internationalizing a React app actually involves once you get past the word 'translation'.
FSD is one of the best frontend methodologies out there. Used without thinking, it turns a complex component into a scavenger hunt across eight folders. Here's what I learned.
Every data pattern so far has the client asking and the server answering. Real-time inverts that — the server speaks first, and your UI has to be listening. The mistake is treating that live connection as a second, parallel source of truth. Here's how I keep a React app live without ending up with two states that disagree.
The demos are intoxicating — a chat box, a streaming response, thirty lines of code and it feels like magic. Then you try to ship it and the hard parts show up all at once: streaming UI, structured output you can trust, state that doesn't fight you. Here's what building AI into a real React app actually takes.
Most testing advice is either "100% coverage" zealotry or "tests slow you down" cynicism. Both miss the point. A test is a trade — effort now for confidence later — and the skill is knowing which trades pay off. Here's how I test React without a brittle suite that everyone hates.
Deployment used to be a separate discipline — servers, pipelines, a person whose whole job was getting code to production. Modern platforms compressed it into a git push. Here's how to think about hosting a React app, what the tiers actually mean, and where the magic stops.
"Add a database" used to mean provisioning a server, managing connections, and running migrations by hand. Serverless quietly rewrote that whole sentence. Here's what a React developer actually needs to know about picking and using a database in 2026.