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ABI function, event, and contrustor encoder/decoder




ABI Coder

A set of high-level ABI encoding and decoding utils.


There are several packages that provide ABI coding utils. However, there is no a high-level solution in the Ethers ecosystem. web3-eth-abi and abi-decoder depend on web3.js. @ethersproject/abi is pretty low-level. ethereumjs-abi works only with functions. Many other packages provide encoding or decoding only.


  • Function coding
  • Event coding
  • Constructor coding
  • TS support


npm install abi-coder

This package requires ethers V6. If you use ethers V5, you need to install abi-coder V4.

This package is a pure ESM package. Follow this guide for more info.


import { Coder } from 'abi-coder';

import * as erc20Abi from './abi/erc20.json';

const erc20Coder = new Coder(erc20Abi);

// 0x18160ddd

	name: 'Transfer',
	inputs: [...],
	values: [

  name: 'transfer',
  inputs: [
      name: 'from',
      type: 'address',
      name: 'amount',
      type: 'uint256',
  values: [
// '0xa9059cbb000000000000000000000000694c6aea9444876d4fa9375fc9089c370f8e9eda0000000000000000000000000000000000000000000000370c9b5ef669c35300'


  • Coder(abi)
    • utils
      • getFunctionSelector(name: string): string
      • getEventTopic(name: string): string
    • decoding
      • decodeConstructor(data: string): Constructor
      • decodeEvent(topics: string[], data: string): Event
      • decodeFunction(data: string): FunctionData
      • decodeFunctionOutput(name: string, data: string): FunctionOutputData
    • encoding
      • encodeConstructor(constructorData: Constructor): string
      • encodeEvent(eventData: Event): EventEncoding
      • encodeFunction(functionData: FunctionData): string
      • encodeFunctionOutput(functionData: FunctionOutputData): string