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

# Meow API error codes, response format, and debugging

> Understand the JSON error response format and reference the common Meow API error codes for accounts, transactions, contacts, and authentication failures.

Errors return JSON with `code`, `message`, and `debug_message`. The `code` aligns with FDX where possible; `debug_message` is for troubleshooting only.

## Error Response Format

```json theme={null}
{
  "code": 701,
  "message": "Account not found",
  "debug_message": "Account not found. Use /accounts to get a list of accounts and their IDs."
}
```

## Common Error Codes

| Code  | Description                                   |
| ----- | --------------------------------------------- |
| `500` | Internal server error                         |
| `501` | Subsystem unavailable                         |
| `503` | Scheduled maintenance                         |
| `601` | Data not found                                |
| `602` | Customer not authorized                       |
| `701` | Account not found                             |
| `703` | Invalid input (including invalid date ranges) |
| `704` | Account type not supported                    |
| `705` | Account is closed                             |
| `801` | Transaction not found                         |