How do you debug a Flutter issue efficiently?

Flutter errors often cascade. A layout exception can trigger several follow-on messages, so the first stack trace is usually the useful one. The Inspector shows the widget tree, constraints and render objects. DevTools adds timeline, memory and network views that a print statement cannot replace.

void main() {
  FlutterError.onError = (details) {
    FlutterError.presentError(details);
    CrashReporter.record(details.exception, details.stack);
  };
  runApp(const App());
}

• Use debugPrint or a structured logger, not print, for throttled and searchable output
• Inspect constraints in the Inspector when layout overflows
• Check whether the error happens in debug only, profile only or release only
• Use breakpoints and the debugger rather than adding logs to hot paths
• Capture platform logs with adb logcat or the Xcode console for native crashes

A disciplined reproduction

I try to reduce the issue to the smallest widget or function that still fails. Then I confirm whether it is data, timing, layout or platform-specific. That prevents changing several things at once. After the fix, I add a test that fails on the old behaviour so the bug does not return.