function base64ToArrayBuffer(base64) {
var binaryString = atob(base64);
var bytes = new Uint8Array(binaryString.length);
for (var i = 0; i < binaryString.length; i++) {
bytes[i] = binaryString.charCodeAt(i);
}
return bytes.buffer;
}
Top answer 1 of 14
289
function base64ToArrayBuffer(base64) {
var binaryString = atob(base64);
var bytes = new Uint8Array(binaryString.length);
for (var i = 0; i < binaryString.length; i++) {
bytes[i] = binaryString.charCodeAt(i);
}
return bytes.buffer;
}
2 of 14
177
Using TypedArray.from:
Uint8Array.from(atob(base64_string), c => c.charCodeAt(0))
Performance to be compared with the for loop version of Goran.it answer.
GeeksforGeeks
geeksforgeeks.org › javascript › convert-base64-string-to-arraybuffer-in-javascript
Convert base64 String to ArrayBuffer In JavaScript - GeeksforGeeks
August 5, 2025 - The atob() function decodes a Base64-encoded string into a binary string. The Uint8Array constructor can then be used to convert this binary string into an ArrayBuffer. Example: This function converts a Base64-encoded string into an ArrayBuffer.
javascript - Convert base64 string to ArrayBuffer - Stack Overflow
I need to convert a base64 encode string into an ArrayBuffer. The base64 strings are user input, they will be copy and pasted from an email, so they're not there when the page is loaded. I would li... More on stackoverflow.com
Base64 encode ArrayBuffer
I have a set of bytes in an ArrayBuffer. I need to base64 encode this in k6. How do I accomplish this? In node.js it is data.toString(‘base64’) in browsers the btoa() function seems to be the way to go. Neither of these works in k6, or I did not manage to get them to work. More on community.grafana.com
3
0
December 7, 2020javascript - How can I convert an ArrayBuffer to a base64-encoded string? - Stack Overflow
I need an efficient (read native) way to convert an ArrayBuffer to a base64 string which needs to be used on a multipart post. More on stackoverflow.com
Convert ArrayBuffer to Base64
this one looks badass https://www.npmjs.com/package/react-native-quick-base64 More on reddit.com
8
3
April 17, 2024GitHub
github.com › niklasvh › base64-arraybuffer
GitHub - niklasvh/base64-arraybuffer: Encode/decode base64 data into ArrayBuffers · GitHub
npm install base64-arraybuffer · The library encodes and decodes base64 to and from ArrayBuffers · encode(buffer) - Encodes ArrayBuffer into base64 string · decode(str) - Decodes base64 string to ArrayBuffer · You can run the test suite ...
Author niklasvh
Top answer 1 of 4
276
function base64ToArrayBuffer(base64) {
var binaryString = atob(base64);
var bytes = new Uint8Array(binaryString.length);
for (var i = 0; i < binaryString.length; i++) {
bytes[i] = binaryString.charCodeAt(i);
}
return bytes.buffer;
}
2 of 4
165
Using TypedArray.from:
Uint8Array.from(atob(base64_string), c => c.charCodeAt(0))
Performance to be compared with the for loop version of Goran.it answer.
GitHub
github.com › blockafrik › base64-arraybuffer
GitHub - blockafrik/base64-arraybuffer: Javascript module for converting base-64 to arraybuffer and from arraybuffer to base-64 · GitHub
Javascript module for converting base-64 to arraybuffer and from arraybuffer to base-64 - blockafrik/base64-arraybuffer
Author blockafrik
npm
npmjs.com › package › base64-arraybuffer
base64-arraybuffer - npm
January 22, 2022 - Latest version: 1.0.2, last published: 5 years ago. Start using base64-arraybuffer in your project by running `npm i base64-arraybuffer`. There are 532 other projects in the npm registry using base64-arraybuffer.
» npm install base64-arraybuffer
Published Jan 22, 2022
Version 1.0.2
Java2s
java2s.com › example › nodejs › string › convert-base64-string-to-arraybuffer.html
Convert base64 string to arraybuffer - Node.js String
base64ToArrayBuffer: function (base64) { var binary_string = window.atob(base64); var len = binary_string.length; var bytes = new Uint8Array(len); for (var i = 0; i < len; i++) { bytes[i] = binary_string.charCodeAt(i); }/*from w w w .
TC39
tc39.es › proposal-arraybuffer-base64
Proposed Support for Base64 in JavaScript
let arr = new Uint8Array([72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100]); console.log(arr.toHex()); // '48656c6c6f20576f726c64' ... let string = '48656c6c6f20576f726c64'; console.log(Uint8Array.fromHex(string)); // Uint8Array([72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100]) The base64 methods take an optional options bag which allows specifying the alphabet as either "base64" (the default) or "base64url" (the URL-safe variant).
GitHub
github.com › MrPropre › base64-u8array-arraybuffer
GitHub - MrPropre/base64-u8array-arraybuffer: 📦 A simple, lightweight, and efficient JavaScript library to manage encoding/decoding between base64 data, Uint8Arrays, and ArrayBuffers
import { base64ToArrayBuffer } from 'base64-u8array-arraybuffer' const buffer = base64ToArrayBuffer('base64 string here') ... Note ES Module syntax also works in modern browsers. You just need to add type="module" to your <script> tag.
Author MrPropre
The Web Dev
thewebdev.info › home › how to convert base64 string to arraybuffer with javascript?
How to convert base64 string to ArrayBuffer with JavaScript? - The Web Dev
April 24, 2022 - To convert base64 string to ArrayBuffer with JavaScript, we can use the Uint8Array.from method.
YouTube
youtube.com › hey delphi
JavaScript : Convert base64 string to ArrayBuffer - YouTube
JavaScript : Convert base64 string to ArrayBufferTo Access My Live Chat Page, On Google, Search for "hows tech developer connect"I have a hidden feature that...
Published May 5, 2023 Views 33
xjavascript
xjavascript.com › blog › convert-base64-string-to-arraybuffer
How to Convert Base64 String to ArrayBuffer in JavaScript: Client-Side Solution for User Input (No Server AJAX) — xjavascript.com
Use cases: Web APIs like FileReader, Web Audio API, and WebGL require ArrayBuffer for binary operations. It’s also critical for parsing binary file formats (e.g., PNG headers, ZIP files) client-side. You might need to convert Base64 to ArrayBuffer in scenarios like:
Snyk
snyk.io › advisor › base64-arraybuffer › base64-arraybuffer code examples
Top 5 base64-arraybuffer Code Examples | Snyk
async setFileName(fileId: number, newName: string) { await this._initialize() let file = await this.getFileInfo(fileId) let jsonFileData = JSON.parse(Buffer.from(abBase64.encode(await this._storage.getFile(file.storageRef)), 'base64').toString('ascii')) jsonFileData.name = newName jsonFileData.lastModification = new Date() const fileDataStorageRef = await this._storage.addFile(abBase64.decode(Buffer.from(JSON.stringify(jsonFileData)).toString('base64'))) await this._contract.setStorageRef(fileId, fileDataStorageRef) this._sendEvent('FileChange', { fileId }); }
Isummation
isummation.com › home › development › convert arraybuffer to base64 string and vice-versa
JavaScript - Convert arrayBuffer to Base64 string and vice-versa iSummation - USA
August 30, 2019 - function base64ToArrayBuffer(base64) { var binary_string = window.atob(base64); var len = binary_string.length; var bytes = new Uint8Array( len ); for (var i = 0; i < len; i++) { bytes[i] = binary_string.charCodeAt(i); } return bytes.buffer; ...
CloudDefense.ai
clouddefense.ai › code › javascript › example › base64-arraybuffer
Top 10 Examples of <!-- -->base64-arraybuffer<!-- --> code in Javascript | CloudDefense.AI
async setFileName(fileId: number, newName: string) { await this._initialize() let file = await this.getFileInfo(fileId) let jsonFileData = JSON.parse(Buffer.from(abBase64.encode(await this._storage.getFile(file.storageRef)), 'base64').toString('ascii')) jsonFileData.name = newName jsonFileData.lastModification = new Date() const fileDataStorageRef = await this._storage.addFile(abBase64.decode(Buffer.from(JSON.stringify(jsonFileData)).toString('base64'))) await this._contract.setStorageRef(fileId, fileDataStorageRef) this._sendEvent('FileChange', { fileId }); }
Grafana
community.grafana.com › grafana k6 › oss support
Base64 encode ArrayBuffer - OSS Support - Grafana Labs Community Forums
December 7, 2020 - I have a set of bytes in an ArrayBuffer. I need to base64 encode this in k6. How do I accomplish this? In node.js it is data.toString(‘base64’) in browsers the btoa() function seems to be the way to go. Neither of the…
Base64
base64.dev › home › articles › base64 in javascript
Base64 Encoding & Decoding in JavaScript — base64.dev
May 28, 2026 - To encode raw binary data (e.g., ... } return btoa(binary); } // Base64 to ArrayBuffer function base64ToArrayBuffer(base64) { const binary = atob(base64); const bytes = new Uint8Array(binary.length); for (let i = 0; i < ...
Top answer 1 of 16
378
function _arrayBufferToBase64( buffer ) {
var binary = '';
var bytes = new Uint8Array( buffer );
var len = bytes.byteLength;
for (var i = 0; i < len; i++) {
binary += String.fromCharCode( bytes[ i ] );
}
return window.btoa( binary );
}
but, non-native implementations are faster e.g. https://gist.github.com/958841 see http://jsperf.com/encoding-xhr-image-data/6
jsPerf.com is jsPerf.app now: https://jsperf.app/encoding-xhr-image-data/51
Updated benchmarks: https://jsben.ch/wnaZC
2 of 16
208
This works fine for me:
var base64String = btoa(String.fromCharCode.apply(null, new Uint8Array(arrayBuffer)));
In ES6, the syntax is a little simpler:
const base64String = btoa(String.fromCharCode(...new Uint8Array(arrayBuffer)));
As pointed out in the comments, this method may result in a runtime error in some browsers when the ArrayBuffer is large. The exact size limit is implementation dependent in any case.
npm
npmjs.com › package › base64-arraybuffer-es6
base64-arraybuffer-es6 - npm
December 16, 2023 - decode(str [, ArrayBufferOptions]) - Decodes base64 string to ArrayBuffer
» npm install base64-arraybuffer-es6
Published Dec 16, 2023
Version 3.1.0
Author Brett Zamir
Technocat Games
technocatgames.com › blog › fast-arraybuffer-to-base64-in-javascript
Fast ArrayBuffer to Base64 in JavaScript - Technocat Games
December 19, 2024 - function base64ToArrayBuffer(base64String) { const binaryString = atob(base64String); const len = binaryString.length; const array = new Uint8Array(len); for (let i = 0; i < len; i++) { array[i] = binaryString.charCodeAt(i); } return array.buffer; ...