ethereum-input-data-decoder

Ethereum input data decoder

Ethereum smart contract transaction input data decoder

Uses ethereumjs-abi for decoding.

Demo

https://lab.miguelmota.com/ethereum-input-data-decoder

Install

npm install ethereum-input-data-decoder

Usage

Pass ABI file path to decoder constructor:

const InputDataDecoder = require('ethereum-input-data-decoder');
const decoder = new InputDataDecoder(`${__dirname}/abi.json`);

Alternatively, you can pass ABI array object to constructor;

const abi = JSON.parse(fs.readFileSync(`${__dirname}/abi.json`));
const decoder = new InputDataDecoder(abi);

example abi

Then you can decode input data:

const data = `0x67043cae0000000000000000000000005a9dac9315fdd1c3d13ef8af7fdfeb522db08f020000000000000000000000000000000000000000000000000000000058a20230000000000000000000000000000000000000000000000000000000000040293400000000000000000000000000000000000000000000000000000000000000a0f3df64775a2dfb6bc9e09dced96d0816ff5055bf95da13ce5b6c3f53b97071c800000000000000000000000000000000000000000000000000000000000000034254430000000000000000000000000000000000000000000000000000000000`;

const result = decoder.decodeData(data);

console.log(result);

{
  "name": "registerOffChainDonation",
  "types": [
    "address",
    "uint256",
    "uint256",
    "string",
    "bytes32"
    ],
    "inputs": [
      <BN: 5a9dac9315fdd1c3d13ef8af7fdfeb522db08f02>,
      <BN: 58a20230>,
      <BN: 402934>,
      "BTC",
      <Buffer f3 df ... 71 c8>
    ]
}

Example using input response from web3.getTransaction:

web3.eth.getTransaction(txHash, (error, txResult) => {
  const result = decoder.decodeData(txResult.input);
  console.log(result);
});

Test

npm test

FAQ

• Q: How can I retrieve the ABI?

  • A: You can generate the ABI from the solidity source files using the Solidity Compiler.

    solc --abi MyContract.sol -o build
    

• Q: Can this library decode contract creation input data?

  • A: Yes, it can decode contract creation input data.

License

MIT