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.ok(isValidChecksumAddress(address))
assert.equal(unpadBuffer(Buffer.from('000000006600', 'hex')), Buffer.from('6600', 'hex'))
assert.equal(new BN('dead', 16).add(new BN('101010', 2)), 57047)
- account
- 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
- Exposed constants
- hash
- Hash functions
- object
- Helper function for creating a binary object (
DEPRECATED
)
- Helper function for creating a binary object (
- signature
- Signing, signature validation, conversion, recovery
- externals
- Helper methods from
ethjs-util
- Re-exports of
BN
,rlp
- Helper methods from
The following methods are available provided by ethjs-util:
- arrayContainsArray
- toBuffer
- getBinarySize
- stripHexPrefix
- isHexPrefixed
- isHexString
- padToEven
- intToHex
- fromAscii
- fromUtf8
- toUtf8
- toAscii
- getKeys
Import can be done directly by function name analogous to the build-in function import:
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.
MPL-2.0