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API Errors and Troubleshooting

Troubleshooting the standard JSON-RPC errors.

Example Error Response 
{
   "jsonrpc":"2.0",
   "id":1,
   "error":{
      "code":-32602, // this is the reference error code 
      "message":"invalid argument 0: json: cannot unmarshal hex string of odd length into Go value of type common.Address"
   }
}
A typical error message returned in JSON contains the following key fields.
1.CODE : The JSON-RPC error code, see below for extended description. 
2.MESSAGE : An explanation of what went wrong, and how you can correct it. 
JSON-RPC Error Codes
Code
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.

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Adding a Custom RPC to Metamask

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Code	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.