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Bun itself is MIT-licensed.

JavaScriptCore

Bun statically links JavaScriptCore (and WebKit) which is LGPL-2 licensed. WebCore files from WebKit are also licensed under LGPL2. Per LGPL2:

(1) If you statically link against an LGPL’d library, you must also provide your application in an object (not necessarily source) format, so that a user has the opportunity to modify the library and relink the application.

You can find the patched version of WebKit used by Bun here: https://github.com/oven-sh/webkit. If you would like to relink Bun with changes:

  • git submodule update --init --recursive
  • make jsc
  • zig build

This compiles JavaScriptCore, compiles Bun’s .cpp bindings for JavaScriptCore (which are the object files using JavaScriptCore) and outputs a new bun binary with your changes.

Linked libraries

Bun statically links these libraries:

Library License
boringssl several licenses
brotli MIT
libarchive several licenses
lol-html BSD 3-Clause
mimalloc MIT
picohttp dual-licensed under the Perl License or the MIT License
zstd dual-licensed under the BSD License or GPLv2 license
simdutf Apache 2.0
tinycc LGPL v2.1
uSockets Apache 2.0
zlib-cloudflare zlib
c-ares MIT licensed
libicu 72 license here
libbase64 BSD 2-Clause
libuv (on Windows) MIT
libdeflate MIT
A fork of uWebsockets Apache 2.0 licensed
Parts of Tigerbeetle's IO code Apache 2.0 licensed

Polyfills

For compatibility reasons, the following packages are embedded into Bun's binary and injected if imported.

Package License
assert MIT
browserify-zlib MIT
buffer MIT
constants-browserify MIT
crypto-browserify MIT
domain-browser MIT
events MIT
https-browserify MIT
os-browserify MIT
path-browserify MIT
process MIT
punycode MIT
querystring-es3 MIT
stream-browserify MIT
stream-http MIT
string_decoder MIT
timers-browserify MIT
tty-browserify MIT
url MIT
util MIT
vm-browserify MIT

Additional credits

  • Bun's JS transpiler, CSS lexer, and Node.js module resolver source code is a Zig port of @evanw’s esbuild project.
  • Credit to @kipply for the name "Bun"!