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Tooling · easy

20. Debugging tools

Metro, React DevTools, and console logging.

1 min read3 questionsup to 50 XPtopic 20/50

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Metro is the JS bundler that serves your app during development and enables Fast Refresh, so most edits appear almost instantly without losing component state.

console.log("balance:", balance);
console.warn("using fallback RPC");
console.error("transaction failed", err);

React DevTools (usable via Flipper or standalone) lets you inspect the component tree and props/state live; for native-level crashes, Xcode/Android Studio logs are the next stop.

How to study this topic

  1. 1. Read the explanation once end to end, skipping the code.
  2. 2. Re-read the code snippets and say out loud what each line does.
  3. 3. Answer the quiz without scrolling back — that is the real check.
  4. 4. Read every explanation, even for the answers you got right.

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Check your understanding

  1. 1. What is Metro?

  2. 2. What does Fast Refresh do?

  3. 3. Where would you look for a native-level crash?

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