# ethereumjs-util > A collection of utility functions for Ethereum Latest version **7.1.5** (published 2022-06-03) · MPL-2.0 license · 0 weekly downloads ## Install ```sh npm install ethereumjs-util pnpm add ethereumjs-util yarn add ethereumjs-util bun add ethereumjs-util ``` ## Health **Score 40/100 (D)** — status: abandoned. Positive: has types; no vulnerabilities; high maintenance score; high quality score. Warnings: low downloads; no esm support. Negative: abandoned. ## Facts | | | |---|---| | Version | 7.1.5 | | Published | 2022-06-03 | | First published | 2015-01-28 | | Weekly downloads | 0 | | License | MPL-2.0 | | TypeScript types | bundled | | Module format | CommonJS | | Node | >=10.0.0 | | Dependencies | 5 | | Unpacked size | 302.7 KB | | Known vulnerabilities | 0 | | Install scripts | no | | GitHub stars | 2755 | | Author | mjbecze | | Maintainers | holgerd77, evertonfraga, ralxz, null_radix, axic, jwasinger | | Keywords | ethereum, utilities, utils | ## Links - npm: https://www.npmjs.com/package/ethereumjs-util - Repository: https://github.com/ethereumjs/ethereumjs-monorepo - Homepage: https://github.com/ethereumjs/ethereumjs-monorepo/tree/master/packages/util#readme - Issues: https://github.com/ethereumjs/ethereumjs-monorepo/issues?q=is%3Aissue+label%3A%22package%3A+util%22 - npm.io page: https://npm.io/package/ethereumjs-util ## Dependencies (5) - [rlp](https://npm.io/package/rlp.md) ^2.2.4 - [bn.js](https://npm.io/package/bn.js.md) ^5.1.2 - [create-hash](https://npm.io/package/create-hash.md) ^1.1.2 - [@types/bn.js](https://npm.io/package/@types/bn.js.md) ^5.1.0 - [ethereum-cryptography](https://npm.io/package/ethereum-cryptography.md) ^0.1.3 ## Recent versions - 7.1.5 (latest) — 2022-06-03 - 7.1.4 — 2022-02-01 - 7.1.3 — 2021-10-14 - 7.1.2 — 2021-09-29 - 7.1.1 — 2021-09-27 - 7.1.0 — 2021-07-08 - 7.0.10 — 2021-04-01 - 7.0.9 — 2021-03-04 - 7.0.8 — 2021-02-02 - 7.0.7 — 2020-10-19 - 7.0.6 — 2020-10-08 - 7.0.5 — 2020-09-10 - 7.0.4 — 2020-08-04 - 4.5.1 — 2020-07-16 - 5.2.1 — 2020-07-16 - … 69 more at https://npm.io/package/ethereumjs-util/versions ## README # ethereumjs-util [![NPM Package][util-npm-badge]][util-npm-link] [![GitHub Issues][util-issues-badge]][util-issues-link] [![Actions Status][util-actions-badge]][util-actions-link] [![Code Coverage][util-coverage-badge]][util-coverage-link] [![Discord][discord-badge]][discord-link] A collection of utility functions for Ethereum. It can be used in Node.js and in the browser with [browserify](http://browserify.org/). # INSTALL `npm install ethereumjs-util` # USAGE ```js import assert from 'assert' import { isValidChecksumAddress, unpadBuffer, BN } from 'ethereumjs-util' assert.ok(isValidChecksumAddress('0x2F015C60E0be116B1f0CD534704Db9c92118FB6A')) assert.ok(unpadBuffer(Buffer.from('000000006600', 'hex')).equals(Buffer.from('6600', 'hex'))) assert.ok(new BN('dead', 16).add(new BN('101010', 2)).eqn(57047)) ``` # API ## Documentation Read the [API docs](docs/). ### Modules - [account](src/account.ts) - Account class - Private/public key and address-related functionality (creation, validation, conversion) - [address](src/address.ts) - Address class and type - [bytes](src/bytes.ts) - Byte-related helper and conversion functions - [constants](src/constants.ts) - Exposed constants - e.g. `KECCAK256_NULL_S` for string representation of Keccak-256 hash of null - [hash](src/hash.ts) - Hash functions - [object](src/object.ts) - Helper function for creating a binary object (`DEPRECATED`) - [signature](src/signature.ts) - Signing, signature validation, conversion, recovery - [types](src/types.ts) - Helpful TypeScript types - [internal](src/internal.ts) - Internalized helper methods - [externals](src/externals.ts) - Re-exports of `BN`, `rlp` ### ethjs-util methods The following methods are available by an internalized version of the [ethjs-util](https://github.com/ethjs/ethjs-util) package (`MIT` license), see [internal.ts](src/internal.ts). The original package is not maintained any more and the original functionality will be replaced by own implementations over time (starting with the `v7.1.3` release, October 2021). - arrayContainsArray - getBinarySize - stripHexPrefix - isHexPrefixed - isHexString - padToEven - fromAscii - fromUtf8 - toUtf8 - toAscii - getKeys They can be imported by name: ```js import { stripHexPrefix } from 'ethereumjs-util' ``` ### Re-Exports `ethereumjs-util` re-exports the following commonly-used libraries: - [BN.js](https://github.com/indutny/bn.js) (version `5.x`) - [rlp](https://github.com/ethereumjs/rlp) (version `2.x`) They can be imported by name: ```js import { BN, rlp } from 'ethereumjs-util' ``` # EthereumJS See our organizational [documentation](https://ethereumjs.readthedocs.io) 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](https://ethereumjs.readthedocs.io/en/latest/contributing.html). # LICENSE MPL-2.0 [util-npm-badge]: https://img.shields.io/npm/v/ethereumjs-util.svg [util-npm-link]: https://www.npmjs.org/package/ethereumjs-util [util-issues-badge]: https://img.shields.io/github/issues/ethereumjs/ethereumjs-monorepo/package:%20util?label=issues [util-issues-link]: https://github.com/ethereumjs/ethereumjs-monorepo/issues?q=is%3Aopen+is%3Aissue+label%3A"package%3A+util" [util-actions-badge]: https://github.com/ethereumjs/ethereumjs-monorepo/workflows/Util/badge.svg [util-actions-link]: https://github.com/ethereumjs/ethereumjs-monorepo/actions?query=workflow%3A%22Util%22 [util-coverage-badge]: https://codecov.io/gh/ethereumjs/ethereumjs-monorepo/branch/master/graph/badge.svg?flag=util [util-coverage-link]: https://codecov.io/gh/ethereumjs/ethereumjs-monorepo/tree/master/packages/util [discord-badge]: https://img.shields.io/static/v1?logo=discord&label=discord&message=Join&color=blue [discord-link]: https://discord.gg/TNwARpR --- _Source: https://npm.io/package/ethereumjs-util · Machine-readable twin of the npm.io package page. 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