> ## Documentation Index
> Fetch the complete documentation index at: https://core.anylayer.org/llms.txt
> Use this file to discover all available pages before exploring further.

# Error Handling Guide

> Comprehensive error handling patterns for ZKScore integration

## Overview

Proper error handling is critical for building robust applications with ZKScore. This guide covers common errors, handling strategies, and recovery patterns.

## Common Errors

### API Errors

<CodeGroup>
  ```javascript JavaScript theme={null}
  try {
    const score = await zkScore.getScore(identity);
  } catch (error) {
    if (error.code === 'IDENTITY_NOT_FOUND') {
      console.error('Identity does not exist');
    } else if (error.code === 'RATE_LIMIT_EXCEEDED') {
      console.error('Rate limit exceeded, please retry later');
    } else if (error.code === 'INVALID_API_KEY') {
      console.error('Invalid API key');
    } else {
      console.error('Unexpected error:', error.message);
    }
  }
  ```
</CodeGroup>

## Error Types

| Code                  | Description            | Action            |
| --------------------- | ---------------------- | ----------------- |
| `IDENTITY_NOT_FOUND`  | Identity doesn't exist | Check ZKS ID      |
| `RATE_LIMIT_EXCEEDED` | Too many requests      | Implement backoff |
| `INVALID_API_KEY`     | API key invalid        | Check credentials |
| `NETWORK_ERROR`       | Network failure        | Retry request     |

## Best Practices

1. **Specific Handling**: Handle each error type specifically
2. **User Feedback**: Provide clear error messages
3. **Retry Logic**: Implement exponential backoff
4. **Logging**: Log errors for monitoring
5. **Graceful Degradation**: Continue with limited functionality

## Related Documentation

* [Best Practices](/guides/best-practices)
* [Rate Limiting](/guides/rate-limiting)