Do all Ethereum networks return the revert reasons as a "message" field?

Question

I noticed that reverted transactions on Kovan don't include the revert reason. I'm getting the generic "Reverted"/ "VM execution error."

Is Koval special in this regard? I know that Ethereum Mainnet includes the reason in the "message" response of the JSON-RPC call.

Answer 1

No, not all Ethereum networks return the revert reason in the message field. Kovan is an exception.

As per the Infura documentation:

On Mainnet, Rinkeby, Ropsten and Goerli, if this call causes the EVM to execute a REVERT operation, an error response of the following form is returned, with the revert reason pre-decoded as a string:

{
 "jsonrpc": "2.0",
 "id": 1,
 "error": {
   "code": 3,
   "message": "execution reverted: Dai/insufficient-balance",
   "data": "0x08c3..."
 }
}

On Kovan, the actual revert reason is instead returned encoded as part of the data field in the response.

{
 "jsonrpc": "2.0",
 "id": 1,
 "error": {
   "code": -32015,
   "data": "Reverted 0x08c3...",
   "message": "VM execution error."
 }
}