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I've found some libraries which decode input from transaction, but all of them require ABI of contract.

Can I decode input data if I know only txHash, contract address and input data?

How etherscan does it?

Here is an example: https://etherscan.io/tx/0x42afb58ccd19e5f30c4e41a352cdc99e6e3f5ba05191215123e935dc15f55c93

Input data is decoded, but there is no source code (ABI) for that contract.

P.S. I'm interested more in JS libraries, but programming language is not so important.

Serge Nikitin
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  • This is question is somehow related https://ethereum.stackexchange.com/questions/7927/how-to-parse-abi-out-of-contract-code , there's a listing of know signatures at https://www.4byte.directory/ . – Ismael Oct 03 '17 at 16:09
  • @Ismael Thank you! This site 4byte.directory is very useful and it finds signatures for many contacts. I'll try to decode with web3 library: web3.eth.abi.decodeParameters(typesArray, hexString); – Serge Nikitin Oct 03 '17 at 17:21

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