Uint8Array is a subclass of the hidden TypedArray class.

May 7, 2026 - This module exports a number of function that let you do common operations - joining Uint8Arrays together, seeing if they have the same contents etc.

January 19, 2022 - There was a suggestion by @jasnell to use Uint8Arrays in new APIs over Buffers as well as a weigh-in by @sindresorhus saying it is easier to author cross-platform APIs when using Uint8Arrays. Here is a context #41553 (comment) That is, t...

Node.js APIs accept plain <Uint8Array>s wherever Buffers are supported as well.

July 10, 2025 - The Uint8Array() constructor creates Uint8Array objects. The contents are initialized to 0 unless initialization data is explicitly provided.

To access its underlying buffer (and construct the typed array as a view on it), you need to write new Uint16Array(buffer.buffer); and new Uint8Array(buffer.buffer);.

Answer (1 of 3): tldr - Uint8Array is a general-purpose byte-array that’s available in both nodejs and browsers. Buffer is a subclass of Uint8Array that’s only available in nodejs (for historical reasons). both are primarily used for manipulating binary (byte) data. historically, when nodejs ...

One of the fundamental data types that plays a significant role in handling binary data is the Uint8Array. A Uint8Array is a typed array in JavaScript and Node.js, which represents an array of 8 - bit unsigned integers.

July 16, 2021 - import toUint8 from 'to-uint8array' const buffer = Buffer.from('abc') const u8 = new Uint8Array([97]) const u16 = new Uint16Array([0, 1, 2]) const ab = new ArrayBuffer(3) toUint8(u16) // Uint8Array(6) [ 0, 0, 1, 0, 2, 0 ] toUint8(ab) // Uint8Array(3) [ 0, 0, 0 ] toUint8('abc') // Uint8Array(3) [ 97, 98, 99 ] toUint8(buffer) // Uint8Array(3) [ 97, 98, 99 ] toUint8(u8) === u8 // true toUint8(u16) === u16 // false toUint8(ab).buffer === ab // true toUint8(u16).buffer === u16.buffer // true toUint8(buffer) instanceof Uint8Array // true toUint8(buffer) instanceof Buffer // false

October 24, 2023 - Instead of Buffer#slice(), use Uint8Array#subarray() or Buffer#subarray().

June 13, 2024 - It doesn't appear that the memory used increases much with the size of the Uint8Array. Doubling the size of each Uint8Array from 12 -> 24 only increases the memory usage to 485MB in the above test.

June 3, 2022 - In my previous post, I used bucket.upload() but after some googling, I’ve switched to file.save(), which takes a Buffer as an argument. (1) When you receive the bytes array, create an instance of Uint8Array, which is extended by the Buffer class. (2) Use bucket.file(filename) to create a File object.

To convert a Node.js Readable stream to an Uint8Array in Bun, you can create a new Response object with the stream as the body, then use bytes() to read the stream into an Uint8Array.

One fundamental way to work with ... TypedArray) plays a significant role. A Uint8Array is a fixed-length array that can store unsigned integer values of a specific byte size....

Convert buf, a Buffer or string to a Uint8Array.

But why Uint8Array? Unlike regular JavaScript arrays, typed arrays like Uint8Array provide a memory-efficient way to handle binary data, with fixed-size elements and direct access to raw bytes. The good news? You don’t need to build custom parsers to convert strings to Uint8Array in Node.js.

Fast SHA-1 digest hash based on Uint8Array, pure JavaScript.

July 7, 2026 - The Node.js Buffer class extends Uint8Array, so no conversion is needed.

July 11, 2022 - Uint8Array – treats each byte in ArrayBuffer as a separate number, with possible values from 0 to 255 (a byte is 8-bit, so it can hold only that much).