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https://github.com/miguelmota/ethereum-input-data-decoder
Ethereum smart contract transaction input data decoder
https://github.com/miguelmota/ethereum-input-data-decoder
abi decoder ethereum javascript library remix smart-contracts solidity utility
Last synced: about 2 months ago
JSON representation
Ethereum smart contract transaction input data decoder
- Host: GitHub
- URL: https://github.com/miguelmota/ethereum-input-data-decoder
- Owner: miguelmota
- License: mit
- Archived: true
- Created: 2017-03-02T04:39:58.000Z (over 7 years ago)
- Default Branch: master
- Last Pushed: 2022-07-30T06:48:24.000Z (about 2 years ago)
- Last Synced: 2024-07-25T10:09:29.837Z (about 2 months ago)
- Topics: abi, decoder, ethereum, javascript, library, remix, smart-contracts, solidity, utility
- Language: JavaScript
- Homepage: https://lab.miguelmota.com/ethereum-input-data-decoder
- Size: 1.48 MB
- Stars: 599
- Watchers: 11
- Forks: 190
- Open Issues: 0
-
Metadata Files:
- Readme: README.md
- Changelog: CHANGELOG.md
- Funding: .github/FUNDING.yml
- License: LICENSE
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README
# ethereum-input-data-decoder
> Ethereum smart contract transaction input data decoder
[](https://raw.githubusercontent.com/miguelmota/ethereum-input-data-decoder/master/LICENSE)
[](https://travis-ci.org/miguelmota/ethereum-input-data-decoder)
[](https://david-dm.org/miguelmota/ethereum-input-data-decoder)
[](http://badge.fury.io/js/ethereum-input-data-decoder)
[](#contributing)
## Demo
[https://lab.miguelmota.com/ethereum-input-data-decoder](https://lab.miguelmota.com/ethereum-input-data-decoder)
## Install
```bash
npm install ethereum-input-data-decoder
```
## Getting started
Pass [ABI](https://github.com/ethereum/wiki/wiki/Ethereum-Contract-ABI) file path to decoder constructor:
```javascript
const InputDataDecoder = require('ethereum-input-data-decoder');
const decoder = new InputDataDecoder(`${__dirname}/abi.json`);
```
Alternatively, you can pass ABI array object to constructor;
```javascript
const abi = [{ ... }]
const decoder = new InputDataDecoder(abi);
```
[example abi](./test/abi.json)
Then you can decode input data:
```javascript
const data = `0x67043cae0000000000000000000000005a9dac9315fdd1c3d13ef8af7fdfeb522db08f020000000000000000000000000000000000000000000000000000000058a20230000000000000000000000000000000000000000000000000000000000040293400000000000000000000000000000000000000000000000000000000000000a0f3df64775a2dfb6bc9e09dced96d0816ff5055bf95da13ce5b6c3f53b97071c800000000000000000000000000000000000000000000000000000000000000034254430000000000000000000000000000000000000000000000000000000000`;
const result = decoder.decodeData(data);
console.log(result);
```
```text
{
"method": "registerOffChainDonation",
"types": [
"address",
"uint256",
"uint256",
"string",
"bytes32"
],
"inputs": [
,
,
,
"BTC",
],
"names": [
"addr",
"timestamp",
"chfCents",
"currency",
"memo"
]
}
```
Example using input response from [web3.getTransaction](https://github.com/ethereum/wiki/wiki/JavaScript-API#web3ethgettransaction):
```javascript
web3.eth.getTransaction(txHash, (error, txResult) => {
const result = decoder.decodeData(txResult.input);
console.log(result);
});
```
### Decoding tuple and tuple[] types
Where `OrderData` is
```solidity
struct OrderData {
uint256 amount;
address buyer;
}
```
Decoding input to a method `someMethod(address,OrderData,OrderData[])` returns data in format
```js
{
method: 'someMethod',
types: ['address', '(uint256,address)', '(uint256,address)[]'],
inputs: [
'0x81c55017F7Ce6E72451cEd49FF7bAB1e3DF64d0C',
[100, '0xA37dE6790861B5541b0dAa7d0C0e651F44c6f4D9']
[[274, '0xea674fdde714fd979de3edf0f56aa9716b898ec8']]
],
names: ['sender', ['order', ['amount', 'buyer']], ['allOrders', ['amount', 'buyer']]]
}
```
- In the `types` field, tuples are represented as a string containing types contained in the tuple
- In the `inputs` field, tuples are represented as an array containing values contained in the tuple
- In the `names` field, tuples are represented as an array with 2 items. Item 1 is the name of the tuple, item 2 is an array containing the names of the values contained in the tuple.
### Decoding Big Numbers
All numbers are returned in [big number](https://github.com/indutny/bn.js) format to preserve precision.
Here's an example of how to convert the big number to a human readable format.
```js
console.log(result.inputs[0].toString(10)) // "5"
console.log(result.inputs[0].toNumber()) // 55
```
Please keep in mind that JavaScript only supports numbers up to 64 bits. Solidity numbers can be up to 256 bits, so you run the risk of truncation when casting or having the big number library error out when trying to parse a large number to a JavaScript Number type.
```js
const n = new BN("543534254523452352345234523455")
console.log(n.toString(10)) // "543534254523452352345234523455"
console.log(n.toNumber()) // ERROR!
```
## CLI
## Install
```bash
npm install -g ethereum-input-data-decoder
```
### Usage
```bash
$ ethereum_input_data_decoder --help
Ethereum smart contract transaction input data decoder
Usage
$ ethereum_input_data_decoder [flags] [input]
Options
--abi, -a ABI file path
--input, -i Input data file path
Examples
$ ethereum_input_data_decoder --abi token.abi --input data.txt
$ ethereum_input_data_decoder --abi token.abi "0x23b872dd..."
```
### Example
Pass ABI file and input data as file:
```bash
$ ethereum_input_data_decoder --abi abi.json --input data.tx
method registerOffChainDonation
address addr 0x5a9dac9315fdd1c3d13ef8af7fdfeb522db08f02
uint256 timestamp 1487012400
uint256 chfCents 4204852
string currency BTC
bytes32 memo 0xf3df64775a2dfb6bc9e09dced96d0816ff5055bf95da13ce5b6c3f53b97071c8
```
Pass ABI file and input data as string:
```bash
$ ethereum_input_data_decoder --abi abi.json 0x67043cae0...000000
method registerOffChainDonation
address addr 0x5a9dac9315fdd1c3d13ef8af7fdfeb522db08f02
uint256 timestamp 1487012400
uint256 chfCents 4204852
string currency BTC
bytes32 memo 0xf3df64775a2dfb6bc9e09dced96d0816ff5055bf95da13ce5b6c3f53b97071c8
```
You can also pipe the input data:
```bash
$ cat data.txt | ethereum_input_data_decoder --abi abi.json
method registerOffChainDonation
address addr 0x5a9dac9315fdd1c3d13ef8af7fdfeb522db08f02
uint256 timestamp 1487012400
uint256 chfCents 4204852
string currency BTC
bytes32 memo 0xf3df64775a2dfb6bc9e09dced96d0816ff5055bf95da13ce5b6c3f53b97071c8
```
## Test
```bash
npm test
```
## Development
1. Clone repository:
```bash
git clone [email protected]:miguelmota/ethereum-input-data-decoder.git
cd ethereum-input-data-decoder/
```
2. Install dependencies:
```bash
npm install
```
3. Make changes.
4. Run tests:
```bash
npm test
```
5. Run linter:
```bash
npm run lint
```
5. Build:
```bash
npm run build
```
## Contributing
Pull requests are welcome!
For contributions please create a new branch and submit a pull request for review.
Many thanks to all the [contributors](https://github.com/miguelmota/ethereum-input-data-decoder/graphs/contributors) for making this a better library for everyone 🙏
## FAQ
- Q: How can I retrieve the ABI?
- A: You can generate the ABI from the solidity source files using the [Solidity Compiler](http://solidity.readthedocs.io/en/develop/installing-solidity.html).
```bash
solc --abi MyContract.sol -o build
```
- Q: Can this library decode contract creation input data?
- A: Yes, it can decode contract creation input data.
- Q: Does this library support ABIEncoderV2?
- A: Yes, but it's buggy. Please submit a [bug report](https://github.com/miguelmota/ethereum-input-data-decoder/issues/new) if you encounter issues.
## License
[MIT](LICENSE)