Describe common tools and techniques for debugging React applications effectively.
01
01
Understand the problem
debuggingdev toolserror handlingstrictmode
02
02
Attempt it yourself
Sketch your approach before reading the solution — that's what interviews test.
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03
03
Study the solution
The solution is waiting
Give it an honest attempt first — then compare your thinking with the full walkthrough.
04
04
Read the code
Error Boundary surfaces a crash while debugging
import { Component } from "react";
class ErrorBoundary extends Component {
state = { error: null };
static getDerivedStateFromError(error) { return { error }; }
render() {
return this.state.error
? <pre style={{ color: "crimson" }}>{String(this.state.error)}</pre>
: this.props.children;
}
}
function Buggy() { return <div>{undefined.oops}</div>; } // throws
export default function App() {
return (
<div style={{ padding: 24, fontFamily: "system-ui" }}>
<ErrorBoundary><Buggy /></ErrorBoundary>
</div>
);
}05
05
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