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.
Server rendering isn't a performance checkbox — it collapses the wall between frontend and backend into one framework. Here's what SSR really buys you, why the client/server line stops being where you think it is, and where TanStack Start fits next to Next.js.
You don't have to write the server. But the shape of the contract between your React app and the backend — REST, tRPC, or a BFF — decides how much of your frontend is real work versus glue code. Here's the part of the backend that's actually yours.
Auth looks like a login form and turns out to be an architecture decision. Where do tokens live, who guards a route, what happens when the session dies mid-request? Here's why I buy auth instead of building it, and the parts that stay yours no matter what you buy.
Append-only markdown memory works great — until it doesn't. After watching the system degrade in production, our team redesigned it from scratch with strict principles: small, high-signal, controlled, and self-maintaining.
"Just use a chart library" hides a real decision. Do you want charts handed to you, or do you want to control every pixel? That choice — and your data size — decides between Recharts, visx, and raw D3. Here's how I pick, and where charts actually get hard.