How do I debug an API issue in a React app?
Use the Network tab. It shows every request, its status, headers, and response. Most API bugs, wrong status, wrong shape, missing headers, can be diagnosed there.
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More FAQs in How to Debug a React UI App Effectively
Use the React DevTools Components tab to inspect props and state, the Profiler for performance, the Network tab for API issues, read the console for specific errors, use strategic logs, binary search to narrow the cause, and isolate the bug in a minimal example.
It records a render and shows which components are slow or re-render unnecessarily, and why they re-rendered. This is essential for performance debugging, where guessing does not help.
When you do not know where a bug is, comment out half the recent changes or components and see if the bug persists. Halving repeatedly narrows the cause fast, instead of trying to reason about the whole app at once.
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