# Intro

The users and developers mainly interact with jsonrpc and nodes on chain. This file shows json-rpc specification and fault info.

# jsonrpc specification

CUN node support http request under json-rpc 2.0 (opens new window) standard.

A typical json-rpc request is as follows:

curl --location --request POST 'https://http-mainnet.coopuinon.net' \
--header 'Content-Type: application/json' \
--data-raw '{"jsonrpc":"2.0","id":3,"method":"web3_clientVersion","params":[]}
'

A typical correct returned value:

{
    "jsonrpc": "2.0",
    "id": 3,
    "result": "Geth/v1.0.1-stable-d094dd75/linux-amd64/go1.13.4"
}

A typical fault returned value:

{
    "jsonrpc": "2.0",
    "id": 3,
    "error": {
        "code": -32601,
        "message": "the method web3_clientVersio does not exist/is not available"
    }
}

Therein “error” returned when a fault occur, with fields code and message.

# json-rpc is error of protocol level.

Reference: protocol file (opens new window)

code message meaning
-32700 Parse error invalid json received by server. Error occurs when resolving json text.
-32600 Invalid Request json sent not valid request.
-32601 Method not found method not exist or invalid
-32602 Invalid params Invalid params
-32603 Internal error JSON-RPC internal error
-32000 to -32099 Server error

# CUN json-rpc error

Reference: docs (opens new window)；

Added part based on json-rpc:

Code Message Meaning Category
-32000 Invalid input fault params non-standard
-32001 Resource not found Resource not found non-standard
-32002 Resource unavailable inaccessible to defined resource non-standard
-32003 Transaction rejected create transaction failed non-standard
-32004 Method not supported unsupported method non-standard
-32005 Limit exceeded request exceed limit non-standard
-32006 JSON-RPC version not supported JSON-RPC version error non-standard

# web3 sdk json-rpc error

Reference: docs (opens new window)

Status code Name Description
4001 User Rejected Request User Rejected Request
4100 Unauthorized Unauthorized request or account
4200 Unsupported Method Unsupported Method Unsupported method by service provider
4900 Disconnected Disconnected by service provider
4901 Chain Disconnected Service provider not linked with corresponding chain

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