Lesson 08 · 12 min
Data from a server
Fetch in an effect. While loading — a separate state. An error is a state too, not an alert.
A typical screen: idle | loading | error | ready. When id changes, the effect downloads JSON. While waiting — a skeleton or "loading". The request failed — an error message and a retry button. Don't put fetch in the component body: every render goes to the network.
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