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A collection of utility functions for Ethereum. It can be used in Node.js and in the browser with browserify.


npm install ethereumjs-util


import assert from 'assert'
import { isValidChecksumAddress, unpadBuffer, BN } from 'ethereumjs-util'

const address = '0x2F015C60E0be116B1f0CD534704Db9c92118FB6A'

assert.equal(unpadBuffer(Buffer.from('000000006600', 'hex')), Buffer.from('6600', 'hex'))

assert.equal(new BN('dead', 16).add(new BN('101010', 2)), 57047)




  • account
    • Account class
    • Private/public key and address-related functionality (creation, validation, conversion)
  • address
    • Address class and type
  • bytes
    • Byte-related helper and conversion functions
  • constants
    • Exposed constants
      • e.g. KECCAK256_NULL_S for string representation of Keccak-256 hash of null
  • hash
    • Hash functions
  • object
    • Helper function for creating a binary object (DEPRECATED)
  • signature
    • Signing, signature validation, conversion, recovery
  • types
    • Helpful TypeScript types
  • externals
    • Helper methods from ethjs-util
    • Re-exports of BN, rlp

ethjs-util methods

The following methods are available provided by ethjs-util:

  • arrayContainsArray
  • toBuffer
  • getBinarySize
  • stripHexPrefix
  • isHexPrefixed
  • isHexString
  • padToEven
  • intToHex
  • fromAscii
  • fromUtf8
  • toUtf8
  • toAscii
  • getKeys

They can be imported by name:

import { intToHex, stripHexPrefix } from 'ethereumjs-util'


Additionally ethereumjs-util re-exports a few commonly-used libraries. These include:


See our organizational documentation for an introduction to EthereumJS as well as information on current standards and best practices.

If you want to join for work or do improvements on the libraries have a look at our contribution guidelines.



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javascript (70,303
typescript (11,579
ethereum (741
hash (127
utilities (107
utils (80
hex (59
signature (56
buffer (46
address (31