A hands-on tutorial for typed API requests, better error handling, cancellation, and server-side rendering in Next.js.

Every React application starts with a few API calls.

You write a fetch , parse some JSON, render a list, and move on.

Then the application grows.

You add authentication. Different endpoints return different errors. Some requests need cancellation. Others need retries. Your Next.js pages fetch data on the server, while client components use TanStack Query. Suddenly, you have multiple API clients, duplicated error handling, and several different ways to send the same HTTP request.

Sound familiar?

The problem isn't that fetch is bad.…