How to decode the contract function name and parameters from a Polygon transaction?

Question

Using this transaction: https://polygonscan.com/tx/0x1b4165c1093936b74803666c75edd720fbd1713b5f77160e3a726299fb04078d

I thought I could simply decode the Input Data using https://github.com/ConsenSys/abi-decoder/ to figure out the function name and parameters, so I can call that function directly from Nodejs.

However, it's just returning undefined :thinking:

const inputData = "0x4ae301550000000000000000000000000000000000000000000000000000000000000060000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000b400000000000000000000000000000000000000000000000000000000000000034254430000000000000000000000000000000000000000000000000000000000";

const decodedData = abiDecoder.decodeMethod(inputData);
console.log(decodedData);

Am I using this package incorrectly? Is there any other way to figure out the contract function name and parameters for this transaction?

Answer 1

yes, you are using the method correctly. the problem is, you don't have the ABI. The ABI is the specification of the contract , similar to variable testABI shown as example at https://github.com/ConsenSys/abi-decoder/ so, because you don't have it (the ABI) you won't be able to decode the input.

You have to provide the abi specification and that is created during compilation of your solidity code when you pass the --abi parameter to solc executable