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User Guide

All information for developers using ethjs-util should consult this document.

Install

npm install --save ethjs-util

Usage

const util = require('ethjs-util');

const value = util.intToBuffer(38272);

// returns <Buffer ...>

Available Methods

arrayContainsArray   <Function (Array, Array) : (Boolean)>
getBinarySize        <Function (String) : (Number)>
intToBuffer          <Function (Number) : (Buffer)>
isHexPrefixed        <Function (String) : (Boolean)>
stripHexPrefix       <Function (String) : (String)>
padToEven            <Function (String) : (String)>
intToHex             <Function (Number) : (String)>
fromAscii,           <Function (String) : (String)>
fromUtf8,            <Function (String) : (String)>
toAscii,             <Function (String) : (String)>
toUtf8,              <Function (String) : (String)>
getKeys,             <Function (Array, String) : (Array)>
isHexString,         <Function (String) : (Boolean)>

Why BN.js?

ethjs has made a policy of using BN.js across all of its repositories. Here are some of the reasons why:

  1. lighter than alternatives (BigNumber.js)
  2. faster than most alternatives, see benchmarks
  3. used by the Ethereum foundation across all ethereumjs repositories
  4. is already used by a critical JS dependency of many ethereum packages, see package elliptic
  5. purposefully does not support decimals or floats numbers (for greater precision), remember, the Ethereum blockchain cannot and will not support float values or decimal numbers.

Browser Builds

ethjs provides production distributions for all of its modules that are ready for use in the browser right away. Simply include either dist/ethjs-util.js or dist/ethjs-util.min.js directly into an HTML file to start using this module. Note, an ethUtil object is made available globally.

<script type="text/javascript" src="ethjs-util.min.js"></script>
<script type="text/javascript">
ethUtil(...);
</script>

Note, even though ethjs should have transformed and polyfilled most of the requirements to run this module across most modern browsers. You may want to look at an additional polyfill for extra support.

Use a polyfill service such as Polyfill.io to ensure complete cross-browser support: https://polyfill.io/

Latest Webpack Figures

Hash: 28b387e39e1016183a78                                                         
Version: webpack 2.1.0-beta.15
Time: 734ms
            Asset     Size  Chunks             Chunk Names
    ethjs-util.js  65.1 kB       0  [emitted]  main
ethjs-util.js.map  79.3 kB       0  [emitted]  main
    + 8 hidden modules

Hash: 4d26e1d501227158f8ab                                                         
Version: webpack 2.1.0-beta.15
Time: 1523ms
            Asset     Size  Chunks             Chunk Names
ethjs-util.min.js  25.4 kB       0  [emitted]  main
    + 8 hidden modules

Other Awesome Modules, Tools and Frameworks

  • web3.js -- the original Ethereum swiss army knife Ethereum Foundation
  • ethereumjs -- critical ethereumjs infrastructure Ethereum Foundation
  • browser-solidity -- an in browser Solidity IDE Ethereum Foundation
  • wafr -- a super simple Solidity testing framework
  • truffle -- a solidity/js dApp framework
  • embark -- a solidity/js dApp framework
  • dapple -- a solidity dApp framework
  • chaitherium -- a JS web3 unit testing framework
  • contest -- a JS testing framework for contracts

Our Relationship with Ethereum & EthereumJS

We would like to mention that we are not in any way affiliated with the Ethereum Foundation or ethereumjs. However, we love the work they do and work with them often to make Ethereum great! Our aim is to support the Ethereum ecosystem with a policy of diversity, modularity, simplicity, transparency, clarity, optimization and extensibility.

Many of our modules use code from web3.js and the ethereumjs- repositories. We thank the authors where we can in the relevant repositories. We use their code carefully, and make sure all test coverage is ported over and where possible, expanded on.