Bun (software)

Last updated
Bun
Original author Jarred Sumner
Developer Oven
Initial releaseSeptember 14, 2021;4 years ago (2021-09-14) [1]
Stable release
1.2.21 [2]   OOjs UI icon edit-ltr-progressive.svg / 25 August 2025;48 days ago (25 August 2025)
Repository github.com/oven-sh/bun
Written in Zig, C++ (JSC bindings), C (WebSocket bindings), TypeScript, JavaScript
Operating system Linux, macOS, Windows
Type Runtime environment
License MIT license [3]
Website bun.com

Bun is a JavaScript runtime, package manager and test runner designed as a drop-in replacement for Node.js. [4] [5] Bun uses Safari's JavaScriptCore as its JavaScript engine, [6] unlike Node.js and Deno, which run on the V8 engine used in by Chromium.

Contents

Overview

Bun supports bundling, minifying, server-side rendering (Svelte, Nuxt.js, Vite). Bundling refers to the process of combining multiple files and assets like JavaScript, CSS, and HTML into a single file, or a smaller number of files, to reduce the number of server requests and enhance performance. [7] Minifying is a technique of compressing these files by removing unnecessary characters (like whitespace, comments, etc.) without affecting their functionality, further optimizing website loading times. Bun provides an API to decide whether to preserve some readability by e.g. keeping whitespace. [7]

The runtime supports foreign function interface (FFI), SQLite3, TLS 1.3, and DNS resolution. It also comes bundled in with common tools like file editing, HTTP servers, Websocket, and hashing. [8]

The official Bun 1.0 was released on September 8, 2023. [9]

Since Bun 1.1 the runtime supports Windows 10 and later (along with Linux and macOS). [10] [11] It also introduced a cross-platform Bun Shell for running some Bash commands without extra dependencies. [10] [11]

Funding

On August 24, 2022, Oven, the company behind Bun, announced it had raised $7 million in funding. The round was led by Kleiner Perkins, with participation from Guillermo Rauch, Y Combinator, and others. [12]

References

  1. ↑ "Releases, oven-sh/bun, Github". GitHub . Retrieved 14 September 2021.
  2. ↑ "Release 1.2.21". 25 August 2025. Retrieved 7 September 2025.
  3. ↑ Sumner, Jarred (2023-07-02). "License". Bun Docs. Archived from the original on 2023-07-06. Retrieved 2023-07-07.
  4. ↑ "What is Bun? | Bun Docs". Bun. Archived from the original on 2023-12-11. Retrieved 2024-04-01.
  5. ↑ Tyson, Matthew (February 23, 2023). "Explore Bun.js: The all-in-one JavaScript runtime". InfoWorld. Archived from the original on October 4, 2023. Retrieved October 11, 2023.
  6. ↑ Omolana, Timilehin (2022-08-02). "What Is Bun.js and Why Is the JavaScript Community Excited About It?". makeuseof.com. Archived from the original on 2023-05-30. Retrieved 2023-05-30.
  7. 1 2 "The Bun Bundler". Bun. 2023-05-16. Archived from the original on 2024-04-03. Retrieved 2024-04-03.
  8. ↑ "Bun APIs". Bun Docs. Archived from the original on September 27, 2023. Retrieved September 11, 2023.
  9. ↑ "Bun 1.0". bun.sh. Archived from the original on 2024-04-30. Retrieved 2024-04-30.
  10. 1 2 "Bun 1.1". Bun. 2024-04-01. Archived from the original on 2024-06-07. Retrieved 2024-04-03.
  11. 1 2 Anderson, Tim (2024-04-02). "Bun 1.1 released with Windows support, stable WebSocket client and more • DEVCLASS". DEVCLASS. Archived from the original on 2024-04-03. Retrieved 2024-04-03.
  12. ↑ Bun [@bunjavascript] (2022-08-24). "Introducing Oven: the company behind Bun. Oven has raised $7m led by @buckymoore at Kleiner Perkins with participation from @rauchg @ycombinator and more https://t.co/HG2TUCQWbL" (Tweet) – via Twitter.
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