With https://github.com/substack/node-browserify you can work with buffers in the Browser by using: https://github.com/toots/buffer-browserify. However: this can be very slow in the browser: For faster access use https://github.com/chrisdickinson/bops
Answer from Martin Heidegger on Stack Overflow Top answer 1 of 4
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With https://github.com/substack/node-browserify you can work with buffers in the Browser by using: https://github.com/toots/buffer-browserify. However: this can be very slow in the browser: For faster access use https://github.com/chrisdickinson/bops
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There is no direct support for Buffer in browser-based JavaScript, and I am not aware of any compatibility library that implements the Buffer API (yet).
The equivalent functionality in the browser is provided by TypedArrays. You can learn about them here:
- https://developer.mozilla.org/en-US/docs/Web/JavaScript/Typed_arrays
When porting a Node Buffer-based implementation to browser-based JavaScript, I found these answers helpful:
- Converting between strings and ArrayBuffers
- Javascript - Converting between Unicode string and ArrayBuffer
GitHub
github.com › feross › buffer
GitHub - feross/buffer: The buffer module from node.js, for the browser. · GitHub
The buffer module from node.js, for the browser. Contribute to feross/buffer development by creating an account on GitHub.
How can I use node.js buffer library in client side javascript - Stack Overflow
So essentially, uncaught refernce ... in the browser. https://nodejs.org/api/buffer.html#buffer_new_buffer_array ... Find the answer to your question by asking. Ask question ... See similar questions with these tags. ... New site design and philosophy for Stack Overflow: Starting February 24, 2026... I’m Jody, the Chief Product and Technology Officer at Stack Overflow. Let’s... 6 How to use node Buffer module in ... More on stackoverflow.com
Goodbye Node.js Buffer
In case you're too lazy to read: The blog post discusses the Node.js Buffer's history, its issues like security vulnerabilities and inefficiencies, and the introduction of a new alternative, TypedArray. The author explains how TypedArray addresses Buffer's shortcomings, providing a more secure and efficient way of handling binary data in Node.js. The transition from Buffer to TypedArray marks a significant improvement in Node.js, aligning it with modern JavaScript standards. If you don't like the summary, just downvote and I'll try to delete the comment eventually 👍 More on reddit.com
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January 5, 2024What is buffer in Node js?
A buffer is simply a representation of binary data. Everything in nodejs, from a string, to a bool, can be watered down into 1’s and 0’s. A buffer lets you take binary, a string, or a number, and then turn it into bits. Buffers are used with the Filesystem (“fs”), HTTP requests/servers, and more commonly in “streams”. Edit: streams take a buffer (or, another stream) and break it into a bunch of tiny buffers. When doing stuff like compression, encryptions, etc. then the stream will make sure only a small buffer is calculated at a time, sending in the small buffers in one at a time. More on reddit.com
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July 26, 2020How to convert image file object to buffer?
You need to know what the input type is. There is multiple ways of sending files. More on reddit.com
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September 5, 202117:10
Node.js data handling: Start Using Streams and Buffers the right ...
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1. Buffers in Node.js EXPLAINED! 🛠️ | Alloc, Encoding & ...
00:58
What is Buffer in Nodejs. Brief introduction of buffers and how ...
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Buffer from method to fill the data in the buffers using Nodejs ...
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Nodejs Tutorial #43 : What is buffer - Read Buffer Data - YouTube
MDN Web Docs
developer.mozilla.org › en-US › docs › Web › JavaScript › Reference › Global_Objects › ArrayBuffer
ArrayBuffer - JavaScript - MDN Web Docs
The ArrayBuffer object is used to represent a generic raw binary data buffer.
W3Schools
w3schools.com › nodejs › met_buffer_from.asp
Node.js Buffer.from() Method
The Buffer.from() method creates a new buffer filled with the specified string, array, or buffer. ... Coding fundamentals as bite-sized lessons and challenges. ... If you want to use W3Schools services as an educational institution, team or ...
MDN Web Docs
developer.mozilla.org › en-US › docs › Web › JavaScript › Reference › Global_Objects › TypedArray › buffer
TypedArray.prototype.buffer - JavaScript - MDN Web Docs
July 10, 2025 - This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015. ... The buffer accessor property of TypedArray instances returns the ArrayBuffer or SharedArrayBuffer referenced by this typed array at construction time.
npm
npmjs.com › package › browser-buffer
browser-buffer - npm
Buffer in your browser!. Latest version: 0.0.1-1, last published: 11 years ago. Start using browser-buffer in your project by running `npm i browser-buffer`. There are 1 other projects in the npm registry using browser-buffer.
» npm install browser-buffer
Published: Jun 22, 2015
Version: 0.0.1-1
Can I Use
caniuse.com › mdn-javascript_builtins_typedarray_buffer
JavaScript built-in: TypedArray: buffer | Can I use... Support tables for HTML5, CSS3, etc
"Can I use" provides up-to-date browser support tables for support of front-end web technologies on desktop and mobile web browsers.
GitHub
github.com › arextar › browser-buffer
GitHub - arextar/browser-buffer: A node-like buffer interface for the browser · GitHub
An attempt at mimicing node.js's Buffer API in the browser using typed arrays. This project uses a lot of code from node.js's (lib/buffer.js)[https://github.com/joyent/node/blob/master/lib/buffer.js]. This library still needs a lot of work both to get it running across the board and to clean up some of the pollution it puts on the UInt8Array prototype.
Starred by 20 users
Forked by 10 users
Languages: JavaScript
Node.js
nodejs.org › api › buffer.html
Buffer | Node.js v26.10.0 Documentation
The Buffer class is a subclass of JavaScript's <Uint8Array> class and extends it with methods that cover additional use cases. Node.js APIs accept plain <Uint8Array>s wherever Buffers are supported as well. While the Buffer class is available within the global scope, it is still recommended to explicitly reference it via an import or require statement. import { Buffer } from 'node:buffer'; // Creates a zero-filled Buffer of length 10.
Top answer 1 of 2
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The Buffer object is only available in NodeJs and does not exist in the browser JS. But there is a script available that can be used available on GitHub.
Add standalone script to HTML from https://github.com/feross/buffer
<script src="https://bundle.run/[email protected]"></script>
Then in JS
const privateKey = buffer.Buffer.from(PRIVATE_KEY_1, "hex");
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The buffer object is not available outside of Node.js, i.e in the browser. This is because (in case you were not aware) Node.js is a javascript runtime, therefore Node.js specific functionalities do not exist within a browser environment, because they are associated with the V8 engine, but not the V8 engine within a browser (note the difference here).
So essentially, uncaught refernce error: buffer is not defined means that this this doesn't exist in the browser.
https://nodejs.org/api/buffer.html#buffer_new_buffer_array
npm
npmjs.com › package › buffer › v › 2.8.3
buffer - npm
November 8, 2019 - As mentioned above, require('buffer') or use the Buffer global with browserify and this module will automatically be included in your bundle. Almost any npm module will work in the browser, even if it assumes that the node Buffer API will be available. To depend on this module explicitly (without browserify), require it like this:
» npm install buffer
Published: Nov 23, 2020
Version: 2.8.3
Author: Feross Aboukhadijeh
Repository: https://github.com/feross/buffer
Homepage: https://github.com/feross/buffer
Reddit
reddit.com › r/javascript › goodbye node.js buffer
r/javascript on Reddit: Goodbye Node.js Buffer
January 5, 2024 - Running in deno will encounter issues due to Buffer, so will running the code in the browser. Uint8Array is defined in all modern JavaScript runtimes, Buffer is not.
Codeguage
codeguage.com › blog › primer-on-node-buffers
A quick primer on buffers in Node.js | Codeguage
July 26, 2026 - There are many forms of Buffer.from(). The one that we're interested in right now is when the given argument is a string: ... Being able to directly interface with buffers in Node in terms of strings is a feature that's not currently enjoyed by browsers. JavaScript in the browser comes with other, separate APIs to deal with strings when they ought to be converted into buffer data and vice versa.
Can I Use
caniuse.com › mdn-javascript_builtins_arraybuffer
JavaScript built-in: ArrayBuffer | Can I use... Support tables for HTML5, CSS3, etc
"Can I use" provides up-to-date browser support tables for support of front-end web technologies on desktop and mobile web browsers.
MDN Web Docs
developer.mozilla.org › en-US › docs › Web › JavaScript › Reference › Global_Objects › SharedArrayBuffer
SharedArrayBuffer - JavaScript - MDN Web Docs
February 10, 2026 - It’s been available across browsers since December 2021. * Some parts of this feature may have varying levels of support. ... The SharedArrayBuffer object is used to represent a generic raw binary data buffer, similar to the ArrayBuffer object, but in a way that they can be used to create views on shared memory. A SharedArrayBuffer is not a Transferable Object, unlike an ArrayBuffer which is transferable. To share memory using SharedArrayBuffer objects from one agent in the cluster to another (an agent is either the web page's main program or one of its web workers), postMessage and structured cloning is used.
GeeksforGeeks
geeksforgeeks.org › node-js-buffer-from-method
Node.js Buffer.from() Method | GeeksforGeeks
April 11, 2023 - The Buffer.from() method is used to create a new buffer containing the specified string, array, or buffer.
MDN Web Docs
developer.mozilla.org › en-US › docs › Web › JavaScript › Reference › Global_Objects › DataView › buffer
DataView.prototype.buffer - JavaScript - MDN Web Docs
July 10, 2025 - const buffer = new ArrayBuffer(8); const dataview = new DataView(buffer); dataview.buffer; // ArrayBuffer { byteLength: 8 }
JavaScript in Plain English
javascript.plainenglish.io › how-to-convert-string-to-buffer-and-data-url-formats-using-client-side-javascript-9514a8c446d2
How To Convert String To Buffer And Data URL Formats Using Client-Side JavaScript | by Charmaine Chui | JavaScript in Plain English
May 30, 2025 - const str = 'Hey. this is a string!'; const buffer = Buffer.from(str, 'utf-8'); // format: ArrayBuffer const b64Str = Buffer.from(str, 'utf-8').toString('base64'); console.log(b64Str); /* Expected result: */ // SGV5LiB0aGlzIGlzIGEgc3RyaW5nIQ== const originalStr = Buffer.from(b64Str, 'base64').toString('utf-8'); console.log(originalStr); /* Expected result: */ // Hey. this is a string! In a browser setting, the two… · 659 followers · ·350 following · 👩💻 Data Analyst. Web & Software Developer. Technical Writer✍ | Trying to make the 🌐 better with baby steps👣 [ 📍SG ] LinkedIn@https://tinyurl.com/5h6cufyy · 182K followers · ·Last published 2 hours ago · New JavaScript and Web Development content every day.
Sindre Sorhus
sindresorhus.com › blog › goodbye-nodejs-buffer
Goodbye, Node.js Buffer — Sindre Sorhus
October 24, 2023 - While Buffer is an instance of Uint8Array, it introduces numerous methods that are not available in other JavaScript environments. Consequently, code leveraging Buffer-specific methods needs polyfilling, preventing many valuable packages from being browser-compatible.
GitHub
github.com › unabandoned › buffer
GitHub - unabandoned/buffer: The buffer module from node.js, for the browser. · GitHub
The buffer module from node.js, for the browser. Contribute to unabandoned/buffer development by creating an account on GitHub.
Author: unabandoned