# Frontend Data Error Handling

> Standardized guidelines and patterns for Frontend Data Error Handling.

- Skill: `valec3/frontend-data-error-handling` (Agent Skill)
- Install (CLI): `npx skillmds@latest add valec3/frontend-data-error-handling`
- Raw SKILL.md: https://api.skillmd.com/api/skills/valec3/frontend-data-error-handling/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Web & Frontend
- Author: valec3 (https://skillmd.com/u/valec3)
- Updated: 2026-09-10
- Page: https://skillmd.com/skills/valec3/frontend-data-error-handling

---


# Frontend Data Error Handling

## When to use this skill
- Handling API errors
- Showing error messages
- Implementing retry logic
- Error boundaries

## Workflow
- [ ] Catch errors at API layer
- [ ] Show user-friendly messages
- [ ] Log errors for debugging
- [ ] Implement retry for transient errors
- [ ] Use error boundaries for crashes

## Instructions

### API Error Handling
```typescript
try {
  const data = await fetchUser(id);
  return data;
} catch (error) {
  if (error.response?.status === 404) {
    throw new NotFoundError('User not found');
  }
  if (error.response?.status >= 500) {
    throw new ServerError('Server error, please try again');
  }
  throw error;
}
```

### React Error Boundary
```typescript
class ErrorBoundary extends React.Component {
  state = { hasError: false, error: null };

  static getDerivedStateFromError(error) {
    return { hasError: true, error };
  }

  componentDidCatch(error, errorInfo) {
    console.error('Error:', error, errorInfo);
  }

  render() {
    if (this.state.hasError) {
      return <ErrorFallback error={this.state.error} />;
    }
    return this.props.children;
  }
}
```

## Resources
- Show friendly messages to users
- Log detailed errors for debugging
- Retry transient failures