Frontend30-45 min
React Error Boundaries
Add error boundaries around risky routes, lazy chunks, and third-party widgets with useful fallback UI and logging.
ReactSentryTypeScript
Prerequisites
- A React app with multiple routes or lazy-loaded screens.
- A place to send client-side error logs.
- Fallback UI copy for broken areas.
1
Plan the implementation
Start by choosing the exact page, route, API, or deployment surface you want to improve. A narrow target makes the implementation measurable and easier to verify.
- Write down the current behavior and the user-facing problem it creates.
- Pick one measurable success signal such as bundle size, latency, error rate, security coverage, or UI responsiveness.
- Identify the files, routes, providers, and environment variables involved.
- Create a rollback note before changing production-sensitive configuration.
2
Set up the required tools
Install or configure only the tools needed for this implementation. Keep config close to the feature so future developers can find the moving parts quickly.
Implementation snippet
npm install react-error-boundaryChecklist
- Dependencies are added to the correct workspace package.
- Environment variables are documented in `.env.example` when needed.
- Local development still starts without production-only secrets.
- The change is small enough to review in one pull request.
3
Implement the core pattern
- Wrap high-level routes with an error boundary.
- Wrap risky widgets such as charts, maps, editors, and payment embeds separately.
- Log errors with route, release version, and component area.
- Give users a retry or navigation action in the fallback UI.
- Test by throwing an error inside a development-only component.
Implementation snippet
import { ErrorBoundary } from "react-error-boundary";
<ErrorBoundary fallback={<ErrorPanel />} onError={logClientError}>
<Dashboard />
</ErrorBoundary>4
Handle edge cases
Checklist
- One widget failure does not blank the whole app.
- Fallback UI does not expose stack traces to users.
- Errors include enough context for debugging.
- Async errors and event-handler errors are handled separately when needed.
5
Verify before production
- Run the app locally and test the normal success path.
- Test one failure path, one empty state, and one slow-network or retry path.
- Run the project build and any related unit or integration tests.
- Check browser console, server logs, and network responses for hidden warnings.
- Document the final behavior, commands used, and any follow-up work.