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JSON-RPC-Error-Codes-Improvement-Proposal.md

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To help developers add proper error handling in the dapp side, we need to implement custom error codes for the returned JSON RPC errors.

JSON RPC Standard errors

Code Possible Return message Description
-32700 Parse error Invalid JSON was received by the server. An error occurred on the server while parsing the JSON text.
-32600 Invalid Request The JSON sent is not a valid Request object.
-32601 Method not found The method does not exist / is not available.
-32602 Invalid params Invalid method parameter(s).
-32603 Internal error Internal JSON-RPC error.
-32000 to -32099 Server error. Reserved for implementation-defined server-errors.

Custom error codes:

Code Possible Return message Description
1 Unauthorized Should be used when some action is not authorized, e.g. sending from a locked account.
2 Action not allowed Should be used when some action is not allowed, e.g. preventing an action, while another depending action is processing on, like sending again when a confirmation popup is shown to the user (?).
3 Execution error Will contain a subset of custom errors in the data field. See below.

Custom error fields

Custom error 3 can contain custom error(s) to further explain what went wrong. They will be contained in the data field of the RPC error message as follows:

{
    code: 3,
    message: 'Execution error',
    data: [{
        code: 102,
        message: 'Insufficient gas'
    },
    {
        code: 103,
        message: 'Gas limit exceeded'
    }]
}
Code Possible Return message Description
100 X doesn't exist Should be used when something which should be there is not found. (Doesn't apply to eth_getTransactionBy* and eth_getBlock*. They return a success with value null)
101 Requires ether Should be used for actions which require something else, e.g. gas or a value.
102 Gas too low Should be used when a to low value of gas was given.
103 Gas limit exceeded Should be used when a limit is exceeded, e.g. for the gas limit in a block.
104 Rejected Should be used when an action was rejected, e.g. because of its content (too long contract code, containing wrong characters ?, should differ from -32602 - Invalid params).
105 Ether too low Should be used when a to low value of Ether was given.

Possible future error codes?

Code Possible Return message Description
106 Timeout Should be used when an action timed out.
107 Conflict Should be used when an action conflicts with another (ongoing?) action.