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web3-eth-abi

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web3-eth-abi

Web3 module encode and decode EVM in/output.

  • 4.2.1-dev.a83e9d5.0
  • Source
  • npm
  • Socket score

Version published
Weekly downloads
592K
increased by10.58%
Maintainers
4
Weekly downloads
 
Created

What is web3-eth-abi?

The web3-eth-abi package is a part of the Web3.js library and is used for encoding and decoding Ethereum ABI (Application Binary Interface) data. It allows developers to interact with smart contracts by encoding function calls and decoding the data returned by smart contracts.

What are web3-eth-abi's main functionalities?

Encoding Function Calls

This feature allows you to encode function calls to be sent to the Ethereum blockchain. The code sample demonstrates how to encode a function call with a uint256 and a string parameter.

const Web3 = require('web3');
const web3 = new Web3();
const abi = require('web3-eth-abi');

const functionSignature = 'myMethod(uint256,string)';
const parameters = [123, 'Hello World'];
const encodedData = abi.encodeFunctionCall({
  name: 'myMethod',
  type: 'function',
  inputs: [{ type: 'uint256', name: 'myNumber' }, { type: 'string', name: 'myString' }]
}, parameters);

console.log(encodedData);

Decoding Function Return Values

This feature allows you to decode the return values from a smart contract function call. The code sample demonstrates how to decode a return value that includes a uint256 and a string.

const Web3 = require('web3');
const web3 = new Web3();
const abi = require('web3-eth-abi');

const encodedReturnValue = '0x000000000000000000000000000000000000000000000000000000000000007b000000000000000000000000000000000000000000000000000000000000000b48656c6c6f20576f726c64000000000000000000000000000000000000000000';
const decodedData = abi.decodeParameters(['uint256', 'string'], encodedReturnValue);

console.log(decodedData);

Encoding Event Logs

This feature allows you to encode event logs for smart contracts. The code sample demonstrates how to encode an event log with a uint256 and a string parameter.

const Web3 = require('web3');
const web3 = new Web3();
const abi = require('web3-eth-abi');

const eventSignature = 'MyEvent(uint256,string)';
const parameters = [123, 'Hello World'];
const encodedEvent = abi.encodeEventSignature({
  name: 'MyEvent',
  type: 'event',
  inputs: [{ type: 'uint256', name: 'myNumber' }, { type: 'string', name: 'myString' }]
});

console.log(encodedEvent);

Decoding Event Logs

This feature allows you to decode event logs from smart contracts. The code sample demonstrates how to decode an event log that includes a uint256 and a string.

const Web3 = require('web3');
const web3 = new Web3();
const abi = require('web3-eth-abi');

const encodedLog = '0x000000000000000000000000000000000000000000000000000000000000007b000000000000000000000000000000000000000000000000000000000000000b48656c6c6f20576f726c64000000000000000000000000000000000000000000';
const decodedLog = abi.decodeLog([
  { type: 'uint256', name: 'myNumber' },
  { type: 'string', name: 'myString' }
], encodedLog, []);

console.log(decodedLog);

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Package last updated on 25 Mar 2024

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