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INTRODUCTION

Why viem

Getting Started

Migration Guide

Ethers v5 → viem

TypeScript

Error Handling

Platform Compatibility

FAQ


CLIENTS & TRANSPORTS

Introduction

Public Client

Wallet Client

Test Client

Build your own Client


TRANSPORTS

HTTP

WebSocket

Custom (EIP-1193)

Fallback

Chains


PUBLIC ACTIONS



Introduction


ACCOUNT

getBalance

getTransactionCount


BLOCK

getBlock

getBlockNumber

getBlockTransactionCount

watchBlockNumber

watchBlocks


CHAIN

getChainId


FEE

estimateFeesPerGas

estimateGas

estimateMaxPriorityFeePerGas

getFeeHistory

getGasPrice


FILTERS & LOGS

createBlockFilter

createEventFilter

createPendingTransactionFilter

getFilterChanges

getFilterLogs

getLogs

watchEvent

uninstallFilter


PROOF

getProof


SIGNATURE

verifyMessage

verifyTypedData


TRANSACTION

call

prepareTransactionRequest

getTransaction

getTransactionConfirmations

getTransactionReceipt

sendRawTransaction

waitForTransactionReceipt

watchPendingTransactions


WALLET ACTIONS



Introduction


ACCOUNT

getAddresses

requestAddresses


ASSETS

watchAsset


CHAIN

addChain

switchChain


DATA

signMessage

signTypedData


PERMISSIONS

getPermissions

requestPermissions


TRANSACTION

prepareTransactionRequest

sendRawTransaction

sendTransaction

signTransaction


TEST ACTIONS



Introduction


ACCOUNT

impersonateAccount

setBalance

setCode

setNonce

setStorageAt

stopImpersonatingAccount


BLOCK

getAutomine

increaseTime

mine

removeBlockTimestampInterval

setAutomine

setIntervalMining

setBlockTimestampInterval

setBlockGasLimit

setNextBlockBaseFeePerGas

setNextBlockTimestamp


NODE

setCoinbase

setMinGasPrice


SETTINGS

reset

setLoggingEnabled

setRpcUrl


STATE

dumpState

loadState

revert

snapshot


TRANSACTION

dropTransaction

getTxpoolContent

getTxpoolStatus

inspectTxpool

sendUnsignedTransaction


ACCOUNTS



JSON-RPC


LOCAL

Private Key

Mnemonic

Hierarchical Deterministic (HD)

Custom

signMessage

signTransaction

signTypedData


CONTRACT



Contract Instances


ACTIONS

createContractEventFilter

deployContract

estimateContractGas

getBytecode

getContractEvents

getStorageAt

multicall

readContract

simulateContract

writeContract

watchContractEvent


ENCODING

decodeDeployData

decodeErrorResult

decodeEventLog

decodeFunctionData

decodeFunctionResult

encodeDeployData

encodeErrorResult

encodeEventTopics

encodeFunctionData

encodeFunctionResult


ENS




ACTIONS

getEnsAddress

getEnsAvatar

getEnsName

getEnsResolver

getEnsText


UTILITIES

labelhash

namehash

normalize


ABI



decodeAbiParameters

encodeAbiParameters

encodePacked

getAbiItem

parseAbi

parseAbiItem

parseAbiParameter

parseAbiParameters


UTILITIES




ADDRESSES

getAddress

getContractAddress

isAddress

isAddressEqual


CHAIN

extractChain


DATA

concat

isBytes

isHex

pad

slice

size

trim


ENCODING

fromBytes

fromHex

fromRlp

toBytes

toHex

toRlp


HASH

getEventSelector

getEventSignature

getFunctionSelector

getFunctionSignature

keccak256

ripemd160

sha256


SIGNATURE

compactSignatureToHex

compactSignatureToSignature

hashMessage

hashTypedData

hexToCompactSignature

hexToSignature

recoverAddress

recoverMessageAddress

recoverPublicKey

recoverTypedDataAddress

signatureToCompactSignature

signatureToHex

verifyMessage

verifyTypedData


TRANSACTION

parseTransaction

serializeTransaction


UNITS

formatEther

formatGwei

formatUnits

parseEther

parseGwei

parseUnits


THIRD PARTY



Account Abstraction

Miscellaneous


GLOSSARY



Terms

Types

Errors

On this page
Table of Contents for current page
   
 * Install
 * Usage
 * Returns
 * Parameters
   * value
   * to
   


On this page


KECCAK256

Calculates the Keccak256 hash of a byte array or hex value.

This function is a re-export of keccak_256 from @noble/hashes – an audited &
minimal JS hashing library.


INSTALL

ts

import { keccak256 } from 'viem'

import { keccak256 } from 'viem'


USAGE

ts

import { keccak256 } from 'viem'

keccak256(new Uint8Array([72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33])
// 0x3ea2f1d0abf3fc66cf29eebb70cbd4e7fe762ef8a09bcc06c8edf641230afec0

keccak256('0xdeadbeef')
// 0xd4fd4e189132273036449fc9e11198c739161b4c0116a9a2dccdfa1c492006f1

// hash utf-8 string
keccak256(toHex('hello world'))
// 0x3ea2f1d0abf3fc66cf29eebb70cbd4e7fe762ef8a09bcc06c8edf641230afec0

import { keccak256 } from 'viem'

keccak256(new Uint8Array([72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33])
// 0x3ea2f1d0abf3fc66cf29eebb70cbd4e7fe762ef8a09bcc06c8edf641230afec0

keccak256('0xdeadbeef')
// 0xd4fd4e189132273036449fc9e11198c739161b4c0116a9a2dccdfa1c492006f1

// hash utf-8 string
keccak256(toHex('hello world'))
// 0x3ea2f1d0abf3fc66cf29eebb70cbd4e7fe762ef8a09bcc06c8edf641230afec0


RETURNS

Hex | ByteArray

The hashed value.


PARAMETERS


VALUE

 * Type: Hex | ByteArray

The hex value or byte array to hash.


TO

 * Type: "bytes" | "hex"
 * Default: "hex"

The output type.

ts

import { keccak256 } from 'viem'

keccak256(
  new Uint8Array([72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33],
  'bytes' 
)
// Uint8Array [62, 162, 241, 208, 171, 243, 252, 102, 207, 41, 238, 187, 112, 203, 212, 231, 254, 118, 46, 248, 160, 155, 204, 6, 200, 237, 246, 65, 35, 10, 254, 192] 

import { keccak256 } from 'viem'

keccak256(
  new Uint8Array([72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100, 33],
  'bytes' 
)
// Uint8Array [62, 162, 241, 208, 171, 243, 252, 102, 207, 41, 238, 187, 112, 203, 212, 231, 254, 118, 46, 248, 160, 155, 204, 6, 200, 237, 246, 65, 35, 10, 254, 192] 

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