Decoding web3 data into human readable format
Tags: web3, datastructures, decoding, opensource
Published: 2024-02-01 11:22:28

In the world of web3 development, we often experience challenges with encoded errors, logs, or data in general. This data, typically presented in an encoded format, is in a lot of different use cases required to be human readable and thus we need libraries to decode it effectively. At blocktorch we came across this need internally, and so we decided to open source the decoder service we have built.

There are a number of good reasons of why data is encoded , for example efficiency, integrity and data security. But of course as long as humans are in the loop to work with the data, decoding the data and respective decoder services are indispensable. For example, we triggered a transaction and got this error: `0xf32bec2f` . From that encoded data alone it is hard to understand the actual error and consequently fix the issue. 

The [blocktorch-xyz/decoder](https://github.com/blocktorch-xyz/decoder) simplifies the decoding process of the data into a human-readable format, thereby enhancing efficiency and clarity in your web3 engineering tasks.

## How the decoder service works
To use [the decoder](https://github.com/blocktorch-xyz/decode), all you require is the Application Binary Interfaces (ABIs) of the relevant smart contract in addition to the encoded data.

Using the previously mentioned example (error `0xf32bec2f`), we will proceed to decode the data. To accomplish this task, we construct a call to the blocktorch-xyz/decoder containing ABIs associated with the smart contract, and the encoded data. The smart contract we are using in our example is the Aggregation Router from [1inch Network](https://1inch.io/) on [Polygon](https://polygon.technology/) with address 0x1111111254eeb25477b68fb85ed929f73a960582. 

The ABI for verified and published smart contracts can be found on block explorers - for the example we are using polygonscan derive the smart contract ABI:  [https://polygonscan.com/address/0x1111111254eeb25477b68fb85ed929f73a960582#code](https://polygonscan.com/address/0x1111111254eeb25477b68fb85ed929f73a960582#code)

```
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```

Once you know the data you want to decode, the smart contract address and ABI you can trigger the call to the decoder service. 

For our example we trigger the following call: 

```
POST /api/internal/transaction/decode
{
    "abis": {
        "0x1111111254eeb25477b68fb85ed929f73a960582": {
            "contractAbi": [{"inputs":[{"internalType":"contract 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IERC20","name":"srcToken","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"minReturn","type":"uint256"},{"internalType":"uint256[]","name":"pools","type":"uint256[]"}],"name":"unoswap","outputs":[{"internalType":"uint256","name":"returnAmount","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address payable","name":"recipient","type":"address"},{"internalType":"contract IERC20","name":"srcToken","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"minReturn","type":"uint256"},{"internalType":"uint256[]","name":"pools","type":"uint256[]"}],"name":"unoswapTo","outputs":[{"internalType":"uint256","name":"returnAmount","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address payable","name":"recipient","type":"address"},{"internalType":"contract IERC20","name":"srcToken","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"minReturn","type":"uint256"},{"internalType":"uint256[]","name":"pools","type":"uint256[]"},{"internalType":"bytes","name":"permit","type":"bytes"}],"name":"unoswapToWithPermit","outputs":[{"internalType":"uint256","name":"returnAmount","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]
        }
    },
    "transaction": {
        "to": "0x1111111254eeb25477b68fb85ed929f73a960582",
        "input": "0x0502b1c50000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001158e460913d000000000000000000000000000000000000000000000000000000000000000ea9ac80000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000100000000000000003b6d034055ff76bffc3cdd9d5fdbbc2ece4528ecce45047e10d1df6e",
        "value": "0x01158e460913d00000",
        "error": {
            "data": "0xf32bec2f"
        }
    }
}
```

The response will be the he human readable data. As you can see now in our example the error we received was "ReturnAmountIsNotEnough" in the "unoswap" function.

```
{
    "transaction": {
        "args": [
            "0x0000000000000000000000000000000000000000",
            {
                "type": "BigNumber",
                "hex": "0x01158e460913d00000"
            },
            {
                "type": "BigNumber",
                "hex": "0xea9ac8"
            },
            [
                {
                    "type": "BigNumber",
                    "hex": "0x3b6d034055ff76bffc3cdd9d5fdbbc2ece4528ecce45047e"
                }
            ]
        ],
        "functionFragment": {
            "type": "function",
            "name": "unoswap",
            "constant": false,
            "inputs": [
                {
                    "name": "srcToken",
                    "type": "address",
                    "indexed": null,
                    "components": null,
                    "arrayLength": null,
                    "arrayChildren": null,
                    "baseType": "address",
                    "_isParamType": true
                },
                {
                    "name": "amount",
                    "type": "uint256",
                    "indexed": null,
                    "components": null,
                    "arrayLength": null,
                    "arrayChildren": null,
                    "baseType": "uint256",
                    "_isParamType": true
                },
                {
                    "name": "minReturn",
                    "type": "uint256",
                    "indexed": null,
                    "components": null,
                    "arrayLength": null,
                    "arrayChildren": null,
                    "baseType": "uint256",
                    "_isParamType": true
                },
                {
                    "name": "pools",
                    "type": "uint256[]",
                    "indexed": null,
                    "components": null,
                    "arrayLength": -1,
                    "arrayChildren": {
                        "name": null,
                        "type": "uint256",
                        "indexed": null,
                        "components": null,
                        "arrayLength": null,
                        "arrayChildren": null,
                        "baseType": "uint256",
                        "_isParamType": true
                    },
                    "baseType": "array",
                    "_isParamType": true
                }
            ],
            "outputs": [
                {
                    "name": "returnAmount",
                    "type": "uint256",
                    "indexed": null,
                    "components": null,
                    "arrayLength": null,
                    "arrayChildren": null,
                    "baseType": "uint256",
                    "_isParamType": true
                }
            ],
            "payable": true,
            "stateMutability": "payable",
            "gas": null,
            "_isFragment": true
        },
        "name": "unoswap",
        "signature": "unoswap(address,uint256,uint256,uint256[])",
        "sighash": "0x0502b1c5",
        "value": {
            "type": "BigNumber",
            "hex": "0x01158e460913d00000"
        }
    },
    "error": {
        "args": [],
        "errorFragment": {
            "type": "error",
            "name": "ReturnAmountIsNotEnough",
            "inputs": [],
            "_isFragment": true
        },
        "name": "ReturnAmountIsNotEnough",
        "signature": "ReturnAmountIsNotEnough()",
        "sighash": "0xf32bec2f"
    }
}
```

The same will also work in case the smart contract uses a proxy, all you need to do is provide the proxy ABI and the service will decode it for you.

## Running the web3 data decoder locally
1.Clone the repository

```
git clone git@github.com:blocktorch-xyz/decoder.git
```

2. Add .env.development file with the following envs (remark: as a general best practice if you push to github please always ensure the files your environment variables are stored in are included in your .gitignore file)

```
BASIC_AUTH_INTERNAL_USERNAME=username
BASIC_AUTH_INTERNAL_PASSWORD=very-secure-password
```

3. Install dependencies and run the service

```
npm i
npm run dev

```
or

```
yarn
yarn run dev
```

That's it, you can run the following call to test it

```
curl --location 'http://localhost:8000/api/internal/transaction/decode' \
--header 'Content-Type: application/json' \
--header 'Authorization: Basic dXNlcm5hbWU6dmVyeS1zZWN1cmUtcGFzc3dvcmQ=' \
--data '{
    "abis": {
        "0x1111111254eeb25477b68fb85ed929f73a960582": {
            "contractAbi": [{"inputs":[{"internalType":"contract IWETH","name":"weth","type":"address"}],"stateMutability":"nonpayable","type":"constructor"},{"inputs":[],"name":"AccessDenied","type":"error"},{"inputs":[],"name":"AdvanceNonceFailed","type":"error"},{"inputs":[],"name":"AlreadyFilled","type":"error"},{"inputs":[],"name":"ArbitraryStaticCallFailed","type":"error"},{"inputs":[],"name":"BadPool","type":"error"},{"inputs":[],"name":"BadSignature","type":"error"},{"inputs":[],"name":"ETHTransferFailed","type":"error"},{"inputs":[],"name":"ETHTransferFailed","type":"error"},{"inputs":[],"name":"EmptyPools","type":"error"},{"inputs":[],"name":"EthDepositRejected","type":"error"},{"inputs":[],"name":"GetAmountCallFailed","type":"error"},{"inputs":[],"name":"IncorrectDataLength","type":"error"},{"inputs":[],"name":"InsufficientBalance","type":"error"},{"inputs":[],"name":"InvalidMsgValue","type":"error"},{"inputs":[],"name":"InvalidMsgValue","type":"error"},{"inputs":[],"name":"InvalidatedOrder","type":"error"},{"inputs":[],"name":"MakingAmountExceeded","type":"error"},{"inputs":[],"name":"MakingAmountTooLow","type":"error"},{"inputs":[],"name":"OnlyOneAmountShouldBeZero","type":"error"},{"inputs":[],"name":"OrderExpired","type":"error"},{"inputs":[],"name":"PermitLengthTooLow","type":"error"},{"inputs":[],"name":"PredicateIsNotTrue","type":"error"},{"inputs":[],"name":"PrivateOrder","type":"error"},{"inputs":[],"name":"RFQBadSignature","type":"error"},{"inputs":[],"name":"RFQPrivateOrder","type":"error"},{"inputs":[],"name":"RFQSwapWithZeroAmount","type":"error"},{"inputs":[],"name":"RFQZeroTargetIsForbidden","type":"error"},{"inputs":[],"name":"ReentrancyDetected","type":"error"},{"inputs":[],"name":"RemainingAmountIsZero","type":"error"},{"inputs":[],"name":"ReservesCallFailed","type":"error"},{"inputs":[],"name":"ReturnAmountIsNotEnough","type":"error"},{"inputs":[],"name":"SafePermitBadLength","type":"error"},{"inputs":[],"name":"SafeTransferFailed","type":"error"},{"inputs":[],"name":"SafeTransferFromFailed","type":"error"},{"inputs":[{"internalType":"bool","name":"success","type":"bool"},{"internalType":"bytes","name":"res","type":"bytes"}],"name":"SimulationResults","type":"error"},{"inputs":[],"name":"SwapAmountTooLarge","type":"error"},{"inputs":[],"name":"SwapWithZeroAmount","type":"error"},{"inputs":[],"name":"TakingAmountExceeded","type":"error"},{"inputs":[],"name":"TakingAmountIncreased","type":"error"},{"inputs":[],"name":"TakingAmountTooHigh","type":"error"},{"inputs":[],"name":"TransferFromMakerToTakerFailed","type":"error"},{"inputs":[],"name":"TransferFromTakerToMakerFailed","type":"error"},{"inputs":[],"name":"UnknownOrder","type":"error"},{"inputs":[],"name":"WrongAmount","type":"error"},{"inputs":[],"name":"WrongGetter","type":"error"},{"inputs":[],"name":"ZeroAddress","type":"error"},{"inputs":[],"name":"ZeroMinReturn","type":"error"},{"inputs":[],"name":"ZeroReturnAmount","type":"error"},{"inputs":[],"name":"ZeroTargetIsForbidden","type":"error"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"maker","type":"address"},{"indexed":false,"internalType":"uint256","name":"newNonce","type":"uint256"}],"name":"NonceIncreased","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"maker","type":"address"},{"indexed":false,"internalType":"bytes32","name":"orderHash","type":"bytes32"},{"indexed":false,"internalType":"uint256","name":"remainingRaw","type":"uint256"}],"name":"OrderCanceled","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"maker","type":"address"},{"indexed":false,"internalType":"bytes32","name":"orderHash","type":"bytes32"},{"indexed":false,"internalType":"uint256","name":"remaining","type":"uint256"}],"name":"OrderFilled","type":"event"},{"anonymous":false,"inputs":[{"indexed":false,"internalType":"bytes32","name":"orderHash","type":"bytes32"},{"indexed":false,"internalType":"uint256","name":"makingAmount","type":"uint256"}],"name":"OrderFilledRFQ","type":"event"},{"anonymous":false,"inputs":[{"indexed":true,"internalType":"address","name":"previousOwner","type":"address"},{"indexed":true,"internalType":"address","name":"newOwner","type":"address"}],"name":"OwnershipTransferred","type":"event"},{"inputs":[{"internalType":"uint8","name":"amount","type":"uint8"}],"name":"advanceNonce","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"offsets","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"and","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"address","name":"target","type":"address"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"arbitraryStaticCall","outputs":[{"internalType":"uint256","name":"","type":"uint256"}],"stateMutability":"view","type":"function"},{"inputs":[{"components":[{"internalType":"uint256","name":"salt","type":"uint256"},{"internalType":"address","name":"makerAsset","type":"address"},{"internalType":"address","name":"takerAsset","type":"address"},{"internalType":"address","name":"maker","type":"address"},{"internalType":"address","name":"receiver","type":"address"},{"internalType":"address","name":"allowedSender","type":"address"},{"internalType":"uint256","name":"makingAmount","type":"uint256"},{"internalType":"uint256","name":"takingAmount","type":"uint256"},{"internalType":"uint256","name":"offsets","type":"uint256"},{"internalType":"bytes","name":"interactions","type":"bytes"}],"internalType":"struct OrderLib.Order","name":"order","type":"tuple"}],"name":"cancelOrder","outputs":[{"internalType":"uint256","name":"orderRemaining","type":"uint256"},{"internalType":"bytes32","name":"orderHash","type":"bytes32"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"orderInfo","type":"uint256"}],"name":"cancelOrderRFQ","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"orderInfo","type":"uint256"},{"internalType":"uint256","name":"additionalMask","type":"uint256"}],"name":"cancelOrderRFQ","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"components":[{"internalType":"uint256","name":"salt","type":"uint256"},{"internalType":"address","name":"makerAsset","type":"address"},{"internalType":"address","name":"takerAsset","type":"address"},{"internalType":"address","name":"maker","type":"address"},{"internalType":"address","name":"receiver","type":"address"},{"internalType":"address","name":"allowedSender","type":"address"},{"internalType":"uint256","name":"makingAmount","type":"uint256"},{"internalType":"uint256","name":"takingAmount","type":"uint256"},{"internalType":"uint256","name":"offsets","type":"uint256"},{"internalType":"bytes","name":"interactions","type":"bytes"}],"internalType":"struct OrderLib.Order","name":"order","type":"tuple"}],"name":"checkPredicate","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"internalType":"contract IClipperExchangeInterface","name":"clipperExchange","type":"address"},{"internalType":"contract IERC20","name":"srcToken","type":"address"},{"internalType":"contract IERC20","name":"dstToken","type":"address"},{"internalType":"uint256","name":"inputAmount","type":"uint256"},{"internalType":"uint256","name":"outputAmount","type":"uint256"},{"internalType":"uint256","name":"goodUntil","type":"uint256"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"vs","type":"bytes32"}],"name":"clipperSwap","outputs":[{"internalType":"uint256","name":"returnAmount","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"contract IClipperExchangeInterface","name":"clipperExchange","type":"address"},{"internalType":"address payable","name":"recipient","type":"address"},{"internalType":"contract IERC20","name":"srcToken","type":"address"},{"internalType":"contract IERC20","name":"dstToken","type":"address"},{"internalType":"uint256","name":"inputAmount","type":"uint256"},{"internalType":"uint256","name":"outputAmount","type":"uint256"},{"internalType":"uint256","name":"goodUntil","type":"uint256"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"vs","type":"bytes32"}],"name":"clipperSwapTo","outputs":[{"internalType":"uint256","name":"returnAmount","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"contract IClipperExchangeInterface","name":"clipperExchange","type":"address"},{"internalType":"address payable","name":"recipient","type":"address"},{"internalType":"contract IERC20","name":"srcToken","type":"address"},{"internalType":"contract IERC20","name":"dstToken","type":"address"},{"internalType":"uint256","name":"inputAmount","type":"uint256"},{"internalType":"uint256","name":"outputAmount","type":"uint256"},{"internalType":"uint256","name":"goodUntil","type":"uint256"},{"internalType":"bytes32","name":"r","type":"bytes32"},{"internalType":"bytes32","name":"vs","type":"bytes32"},{"internalType":"bytes","name":"permit","type":"bytes"}],"name":"clipperSwapToWithPermit","outputs":[{"internalType":"uint256","name":"returnAmount","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"inputs":[],"name":"destroy","outputs":[],"stateMutability":"nonpayable","type":"function"},{"inputs":[{"internalType":"uint256","name":"value","type":"uint256"},{"internalType":"bytes","name":"data","type":"bytes"}],"name":"eq","outputs":[{"internalType":"bool","name":"","type":"bool"}],"stateMutability":"view","type":"function"},{"inputs":[{"components":[{"internalType":"uint256","name":"salt","type":"uint256"},{"internalType":"address","name":"makerAsset","type":"address"},{"internalType":"address","name":"takerAsset","type":"address"},{"internalType":"address","name":"maker","type":"address"},{"internalType":"address","name":"receiver","type":"address"},{"internalType":"address","name":"allowedSender","type":"address"},{"internalType":"uint256","name":"makingAmount","type":"uint256"},{"internalType":"uint256","name":"takingAmount","type":"uint256"},{"internalType":"uint256","name":"offsets","type":"uint256"},{"internalType":"bytes","name":"interactions","type":"bytes"}],"internalType":"struct OrderLib.Order","name":"order","type":"tuple"},{"internalType":"bytes","name":"signature","type":"bytes"},{"internalType":"bytes","name":"interaction","type":"bytes"},{"internalType":"uint256","name":"makingAmount","type":"uint256"},{"internalType":"uint256","name":"takingAmount","type":"uint256"},{"internalType":"uint256","name":"skipPermitAndThresholdAmount","type":"uint256"}],"name":"fillOrder","outputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"payable","type":"function"},{"inputs":[{"components":[{"internalType":"uint256","name":"info","type":"uint256"},{"internalType":"address","name":"makerAsset","type":"address"},{"internalType":"address","name":"takerAsset","type":"address"},{"internalType":"address","name":"maker","type":"address"},{"internalType":"address","name":"allowedSender","type":"address"},{"internalType":"uint256","name":"makingAmount","type":"uint256"},{"internalType":"uint256","name":"takingAmount","type":"uint256"}],"internalType":"struct OrderRFQLib.OrderRFQ","name":"order","type":"tuple"},{"internalType":"bytes","name":"signature","type":"bytes"},{"internalType":"uint256","name":"flagsAndAmount","type":"uint256"}],"name":"fillOrderRFQ","outputs":[{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"uint256","name":"","type":"uint256"},{"internalType":"bytes32","name":"","type":"bytes32"}],"stateMutability":"payable","type":"function"},{"inputs":[{"components":[{"internalType":"uint256","name":"info","type":"uint256"},{"internalType":"address","name":"makerAsset","type":"address"},{"internalType":"address","name":"takerAsset","type":"address"},{"internalType":"address","name":"maker","type":"address"},{"internalType":"address","name":"allowedSender","type":"address"},{"internalType":"uint256","name":"makingAmount","type":"uint256"},{"internalType":"uint256","name":"takingAmount","type":"uint256"}],"internalType":"struct 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IERC20","name":"srcToken","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"minReturn","type":"uint256"},{"internalType":"uint256[]","name":"pools","type":"uint256[]"}],"name":"unoswap","outputs":[{"internalType":"uint256","name":"returnAmount","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address payable","name":"recipient","type":"address"},{"internalType":"contract IERC20","name":"srcToken","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"minReturn","type":"uint256"},{"internalType":"uint256[]","name":"pools","type":"uint256[]"}],"name":"unoswapTo","outputs":[{"internalType":"uint256","name":"returnAmount","type":"uint256"}],"stateMutability":"payable","type":"function"},{"inputs":[{"internalType":"address payable","name":"recipient","type":"address"},{"internalType":"contract IERC20","name":"srcToken","type":"address"},{"internalType":"uint256","name":"amount","type":"uint256"},{"internalType":"uint256","name":"minReturn","type":"uint256"},{"internalType":"uint256[]","name":"pools","type":"uint256[]"},{"internalType":"bytes","name":"permit","type":"bytes"}],"name":"unoswapToWithPermit","outputs":[{"internalType":"uint256","name":"returnAmount","type":"uint256"}],"stateMutability":"nonpayable","type":"function"},{"stateMutability":"payable","type":"receive"}]
        }
    },
    "transaction": {
        "to": "0x1111111254eeb25477b68fb85ed929f73a960582",
        "input": "0x0502b1c50000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001158e460913d000000000000000000000000000000000000000000000000000000000000000ea9ac80000000000000000000000000000000000000000000000000000000000000080000000000000000000000000000000000000000000000000000000000000000100000000000000003b6d034055ff76bffc3cdd9d5fdbbc2ece4528ecce45047e10d1df6e",
        "value": "0x01158e460913d00000",
        "error": {
            "data": "0xf32bec2f"
        }
    }
}'
```

🥳 Congrats you are now set up to decode EVM transactions locally into human readable format!

We highly encourage you to contribute to the package by submitting a PR. You can find the github repository here: [https://github.com/blocktorch-xyz/decoder](https://github.com/blocktorch-xyz/decoder)


![Image description](https://dev-to-uploads.s3.amazonaws.com/uploads/articles/49xkbk7ei24g5wjt0g65.png)

At [Blocktorch](https://www.blocktorch.xyz) we are on a mission to give web3 builders superpowers. Our web3 observability platform provides end-2-end observability like real-time tracing, logging and monitoring for developers building decentralized applications and smart contracts. We support the full stack of any dApp.