The answer
So React can track which items changed. When the API data updates, stable unique keys let React update only the items that changed, instead of re-rendering the whole list. Without them, dynamic updates cause subtle bugs.
How to Handle and Render API Responses in a React UI
Why are stable keys important when rendering API data?
More FAQs in How to Handle and Render API Responses in a React UI
Read the response shape carefully, store the data in state, handle loading and error states, use a finally block to stop the spinner, render lists with stable keys, and handle empty results with a clear message. No blank screens anywhere.
Because you assumed the data is a top-level array when it is nested inside an object. Log the full response and extract the array from the correct field before calling map on it.
To set loading to false whether the fetch succeeded or failed. If you only set it after success, an error leaves the spinner spinning forever. A finally block guarantees the loading state always ends.
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