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

# Errors

> Standard error codes returned by the dApp API.

The dApp API adopts standardized error codes from
[EIP-1193](https://eips.ethereum.org/EIPS/eip-1193) and
[EIP-1474](https://eips.ethereum.org/EIPS/eip-1474). Branch on the code rather than the
message string.

## Error codes

| Code     | Message               | Meaning                                                  |
| -------- | --------------------- | -------------------------------------------------------- |
| `4001`   | User Rejected Request | The user rejected the request.                           |
| `4100`   | Unauthorized          | The requested method or account has not been authorized. |
| `4200`   | Unsupported Method    | The provider does not support the requested method.      |
| `4900`   | Disconnected          | The provider is disconnected from all chains.            |
| `4901`   | Chain Disconnected    | The provider is not connected to the requested chain.    |
| `-32700` | Parse error           | Invalid JSON.                                            |
| `-32600` | Invalid request       | JSON is not a valid request object.                      |
| `-32601` | Method not found      | Method does not exist.                                   |
| `-32602` | Invalid params        | Invalid method parameters.                               |
| `-32603` | Internal error        | Internal JSON-RPC error.                                 |

For the complete specification, see
[CIP-103](https://github.com/canton-foundation/cips/blob/main/cip-0103/cip-0103.md).

## Related

* [Provider API](/sdks-tools/sdks/dapp-sdk/reference/provider-api) — The methods that can return these errors.