npm package discovery and stats viewer.

Discover Tips

  • General search

    [free text search, go nuts!]

  • Package details

    pkg:[package-name]

  • User packages

    @[username]

Sponsor

Optimize Toolset

I’ve always been into building performant and accessible sites, but lately I’ve been taking it extremely seriously. So much so that I’ve been building a tool to help me optimize and monitor the sites that I build to make sure that I’m making an attempt to offer the best experience to those who visit them. If you’re into performant, accessible and SEO friendly sites, you might like it too! You can check it out at Optimize Toolset.

About

Hi, 👋, I’m Ryan Hefner  and I built this site for me, and you! The goal of this site was to provide an easy way for me to check the stats on my npm packages, both for prioritizing issues and updates, and to give me a little kick in the pants to keep up on stuff.

As I was building it, I realized that I was actually using the tool to build the tool, and figured I might as well put this out there and hopefully others will find it to be a fast and useful way to search and browse npm packages as I have.

If you’re interested in other things I’m working on, follow me on Twitter or check out the open source projects I’ve been publishing on GitHub.

I am also working on a Twitter bot for this site to tweet the most popular, newest, random packages from npm. Please follow that account now and it will start sending out packages soon–ish.

Open Software & Tools

This site wouldn’t be possible without the immense generosity and tireless efforts from the people who make contributions to the world and share their work via open source initiatives. Thank you 🙏

© 2024 – Pkg Stats / Ryan Hefner

uint8array-extras

v1.4.0

Published

Useful utilities for working with Uint8Array (and Buffer)

Downloads

1,818,477

Readme

uint8array-extras

Useful utilities for working with Uint8Array (and Buffer)

It's time to transition from Buffer to Uint8Array, and this package helps fill in the gaps.

Note that Buffer is a Uint8Array subclass, so you can use this package with Buffer too.

This package is tree-shakeable and browser-compatible.

This package also includes methods to convert a string to Base64 and back.

Note: In the browser, do not use globalThis.atob() / globalThis.btoa() because they do not support Unicode. This package does.

Install

npm install uint8array-extras

Usage

import {concatUint8Arrays} from 'uint8array-extras';

const a = new Uint8Array([1, 2, 3]);
const b = new Uint8Array([4, 5, 6]);

console.log(concatUint8Arrays([a, b]));
//=> Uint8Array [1, 2, 3, 4, 5, 6]

API

isUint8Array(value: unknown): boolean

Check if the given value is an instance of Uint8Array.

Replacement for Buffer.isBuffer().

import {isUint8Array} from 'uint8array-extras';

console.log(isUint8Array(new Uint8Array()));
//=> true

console.log(isUint8Array(Buffer.from('x')));
//=> true

console.log(isUint8Array(new ArrayBuffer(10)));
//=> false

assertUint8Array(value: unknown)

Throw a TypeError if the given value is not an instance of Uint8Array.

import {assertUint8Array} from 'uint8array-extras';

try {
	assertUint8Array(new ArrayBuffer(10)); // Throws a TypeError
} catch (error) {
	console.error(error.message);
}

toUint8Array(value: TypedArray | ArrayBuffer | DataView): Uint8Array

Convert a value to a Uint8Array without copying its data.

This can be useful for converting a Buffer to a pure Uint8Array. Buffer is already an Uint8Array subclass, but Buffer alters some behavior, so it can be useful to cast it to a pure Uint8Array before returning it.

Tip: If you want a copy, just call .slice() on the return value.

concatUint8Arrays(arrays: Uint8Array[], totalLength?: number): Uint8Array

Concatenate the given arrays into a new array.

If arrays is empty, it will return a zero-sized Uint8Array.

If totalLength is not specified, it is calculated from summing the lengths of the given arrays.

Replacement for Buffer.concat().

import {concatUint8Arrays} from 'uint8array-extras';

const a = new Uint8Array([1, 2, 3]);
const b = new Uint8Array([4, 5, 6]);

console.log(concatUint8Arrays([a, b]));
//=> Uint8Array [1, 2, 3, 4, 5, 6]

areUint8ArraysEqual(a: Uint8Array, b: Uint8Array): boolean

Check if two arrays are identical by verifying that they contain the same bytes in the same sequence.

Replacement for Buffer#equals().

import {areUint8ArraysEqual} from 'uint8array-extras';

const a = new Uint8Array([1, 2, 3]);
const b = new Uint8Array([1, 2, 3]);
const c = new Uint8Array([4, 5, 6]);

console.log(areUint8ArraysEqual(a, b));
//=> true

console.log(areUint8ArraysEqual(a, c));
//=> false

compareUint8Arrays(a: Uint8Array, b: Uint8Array): 0 | 1 | -1

Compare two arrays and indicate their relative order or equality. Useful for sorting.

Replacement for Buffer.compare().

import {compareUint8Arrays} from 'uint8array-extras';

const array1 = new Uint8Array([1, 2, 3]);
const array2 = new Uint8Array([4, 5, 6]);
const array3 = new Uint8Array([7, 8, 9]);

[array3, array1, array2].sort(compareUint8Arrays);
//=> [[1, 2, 3], [4, 5, 6], [7, 8, 9]]

uint8ArrayToString(array: Uint8Array | ArrayBuffer, encoding?: string = 'utf8'): string

Convert a Uint8Array to a string.

  • Parameter: encoding - The encoding to convert from.

Replacement for Buffer#toString(). For the encoding parameter, latin1 should be used instead of binary and utf-16le instead of utf16le.

import {uint8ArrayToString} from 'uint8array-extras';

const byteArray = new Uint8Array([72, 101, 108, 108, 111]);
console.log(uint8ArrayToString(byteArray));
//=> 'Hello'

const zh = new Uint8Array([167, 65, 166, 110]);
console.log(uint8ArrayToString(zh, 'big5'));
//=> '你好'

const ja = new Uint8Array([130, 177, 130, 241, 130, 201, 130, 191, 130, 205]);
console.log(uint8ArrayToString(ja, 'shift-jis'));
//=> 'こんにちは'

stringToUint8Array(string: string): Uint8Array

Convert a string to a Uint8Array (using UTF-8 encoding).

Replacement for Buffer.from('Hello').

import {stringToUint8Array} from 'uint8array-extras';

console.log(stringToUint8Array('Hello'));
//=> Uint8Array [72, 101, 108, 108, 111]

uint8ArrayToBase64(array: Uint8Array, options?: {urlSafe: boolean}): string

Convert a Uint8Array to a Base64-encoded string.

Specify {urlSafe: true} to get a Base64URL-encoded string.

Replacement for Buffer#toString('base64').

import {uint8ArrayToBase64} from 'uint8array-extras';

const byteArray = new Uint8Array([72, 101, 108, 108, 111]);

console.log(uint8ArrayToBase64(byteArray));
//=> 'SGVsbG8='

base64ToUint8Array(string: string): Uint8Array

Convert a Base64-encoded or Base64URL-encoded string to a Uint8Array.

Replacement for Buffer.from('SGVsbG8=', 'base64').

import {base64ToUint8Array} from 'uint8array-extras';

console.log(base64ToUint8Array('SGVsbG8='));
//=> Uint8Array [72, 101, 108, 108, 111]

stringToBase64(string: string, options?: {urlSafe: boolean}): string

Encode a string to Base64-encoded string.

Specify {urlSafe: true} to get a Base64URL-encoded string.

Replacement for Buffer.from('Hello').toString('base64') and btoa().

import {stringToBase64} from 'uint8array-extras';

console.log(stringToBase64('Hello'));
//=> 'SGVsbG8='

base64ToString(base64String: string): string

Decode a Base64-encoded or Base64URL-encoded string to a string.

Replacement for Buffer.from('SGVsbG8=', 'base64').toString() and atob().

import {base64ToString} from 'uint8array-extras';

console.log(base64ToString('SGVsbG8='));
//=> 'Hello'

uint8ArrayToHex(array: Uint8Array): string

Convert a Uint8Array to a Hex string.

Replacement for Buffer#toString('hex').

import {uint8ArrayToHex} from 'uint8array-extras';

const byteArray = new Uint8Array([72, 101, 108, 108, 111]);

console.log(uint8ArrayToHex(byteArray));
//=> '48656c6c6f'

hexToUint8Array(hexString: string): Uint8Array

Convert a Hex string to a Uint8Array.

Replacement for Buffer.from('48656c6c6f', 'hex').

import {hexToUint8Array} from 'uint8array-extras';

console.log(hexToUint8Array('48656c6c6f'));
//=> Uint8Array [72, 101, 108, 108, 111]

getUintBE(view: DataView): number

Read DataView#byteLength number of bytes from the given view, up to 48-bit.

Replacement for Buffer#readUintBE

import {getUintBE} from 'uint8array-extras';

const byteArray = new Uint8Array([0x12, 0x34, 0x56, 0x78, 0x90, 0xab]);

console.log(getUintBE(new DataView(byteArray.buffer)));
//=> 20015998341291

indexOf(array: Uint8Array, value: Uint8Array): number

Find the index of the first occurrence of the given sequence of bytes (value) within the given Uint8Array (array).

Replacement for Buffer#indexOf. Uint8Array#indexOf only takes a number which is different from Buffer's indexOf implementation.

import {indexOf} from 'uint8array-extras';

const byteArray = new Uint8Array([0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef]);

console.log(indexOf(byteArray, new Uint8Array([0x78, 0x90])));
//=> 3

includes(array: Uint8Array, value: Uint8Array): boolean

Checks if the given sequence of bytes (value) is within the given Uint8Array (array).

Returns true if the value is included, otherwise false.

Replacement for Buffer#includes. Uint8Array#includes only takes a number which is different from Buffer's includes implementation.

import {includes} from 'uint8array-extras';

const byteArray = new Uint8Array([0x12, 0x34, 0x56, 0x78, 0x90, 0xab, 0xcd, 0xef]);

console.log(includes(byteArray, new Uint8Array([0x78, 0x90])));
//=> true