ethereumjs-util 7.1.5

Ethereumjs-util is a collection of utility functions specifically designed for Ethereum. With capabilities that can function both in Node.js and in the browser (thanks to browserify), this package offers a spectrum of functionalities related to Ethereum. Key features include account creation, validation, conversion, byte-related helper and conversion methods, hash functions, signature validation, and more. The tool is also able to re-export commonly used libraries such as BN.js and rlp for greater convenience.

In order to use ethereumjs-util, you first need to install it using npm with the command npm install ethereumjs-util. Once installed, you can import and use any function from ethereumjs-util. Here is a simple code usage example:

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

// Validating Ethereum address 
assert.ok(isValidChecksumAddress('0x2F015C60E0be116B1f0CD534704Db9c92118FB6A'))

// Unpadding a buffer
assert.ok(unpadBuffer(Buffer.from('000000006600', 'hex')).equals(Buffer.from('6600', 'hex')))

// Using BN.js for arithmetic operation
assert.ok(new BN('dead', 16).add(new BN('101010', 2)).eqn(57047))

Another feature of ethereumjs-util is the re-exportation of popularly used libraries. Here's a sample usage:

// Importing BN.js and rlp from ethereumjs-util
import { BN, rlp } from 'ethereumjs-util'

The package also provides an internalized version of the ethjs-util package with available methods that can be directly imported:

// Importing a method from ethjs-util
import { stripHexPrefix } from 'ethereumjs-util'

The documentation for ethereumjs-util can be found in the API docs section. For more detailed package overview and standards, the EthereumJS organizational documentation is a useful reference.