Blog

Fixes 20 bugs (addressing 60 👍). Add subshell and positional argument support to Bun Shell, fixing an issue with bun install + sharp on Windows. Printed source code in errors no longer fill up your terminal. Upgrades JavaScriptCore, which includes performance improvements to RegExp, typed arrays, String indexOf and String replace. Error objects and JIT'd function calls use less memory. Fixes several bugs with bun install on Windows. Fixes a bug with Bun.serve() on Windows. Fixes a TOML parser bug impacting escape sequences and windows paths in .toml files

Bun now supports Windows!

Fixes 13 bugs. Adds support for fs.openAsBlob and fs.opendir, fixes edgecase in bun install with multiple bin entries in package.json, fixes bun build --target bun encoding, fixes bug with process.stdin & process.stdout, fixes bug in http2, fixes bug with .env in bun run, fixes various Bun shell bugs and improves Node.js compatibility.

Fixes 7 bugs, bunx uses less memory, bun install gets faster on Docker & WSL, a conflicting devDependency hoisting bug is fixed, a cyclical CommonJS & ESM import crash is fixed, cross-mount fs.cp & fs.copyFile get 50% faster on Linux, and reliability improvements for bun install & bun's runtime

Fixes 13 bugs, including 3 I/O regressions from v1.0.31. Improves Node.js compatibility. 'ws' package can now send & receive ping/pong events. util.promisify'd setTimeout setInterval, setImmediate work now. FileHandle methods have been implemented

Fixes 2 bugs, including a bug with the mv command in Bun Shell and an error in node:crypto when verifying signatures

Fixes 54 bugs (addresses 113 👍 reactions), introduces bun --print, <stdin> | bun run -, bun add --trust, fetch() with Unix sockets, fixes macOS binary size regression, fixes high CPU usage bug in spawn() on older linux, adds util.styleText, Node.js compatibiltiy improvements, bun install bugfixes, and bunx bugfixes

Fixes 27 bugs (addressing 103 👍 reactions), fixes an 8x perf regression in Bun.serve(), adds a new --conditions flag to bun build and Bun's runtime, adds support for expect.assertions() and expect.hasAssertions() in Bun's test runner, fixes crashes and improves Node.js compatibility

Fixes 8 bugs. Bun.stringWidth(a) is a ~6,756x faster drop-in replacement for the popular 'string-width' package. bunx checks for updates more frequently. Adds expect().toBeOneOf() in bun:test. Memory leak impacting Prisma is fixed. Shell now supports advanced redirects like '2>&1', '&>'. Reliability improvements to bunx, bun install, WebSocket client, and Bun Shell

Fixes 6 bugs (addressing 26 👍 reactions). Fixes bugs impacting Prisma and Astro, 'events', 'readline', and 'http2'. Fixes a bug in Bun Shell involving stdin redirection and fixes bugs in bun:test with test.each and describe.only

Fixes 72 bugs (addressing 192 👍 reactions), Bun Shell supports throwing on non-zero exit codes, stream Response bodies using async generators, improves reliability of fetch(), http2 client, Bun.Glob and Bun Shell. Fixes a regression with bun --watch on Linux. Improves Node.js compatibility

Fixes 30 bugs (addressing 60 👍 reactions), adds support for multi-statement queries in bun:sqlite, makes bun --watch more reliable in longer-running sessions, Bun.FileSystemRouter now supports more than 64 routes, fixes a bug with expect().toStrictEqual(), fixes 2 bugs with error.stack, improves Node.js compatibility

Fixes 4 bugs, adds vm.createScript. Fixes a crash in fs.readFile, a crash in Bun.file().text(), a crash in IPC, and a transpiler bug involving loose equals

Fixes 9 bugs and adds Bun Shell, a fast cross-platform shell with seamless JavaScript interop. Fixes a socket timeout bug, a potential crash when socket closes, a Node.js compatibility issue with Hapi, a process.exit bug, and bun install binlinking bug, bun inspect regression, and bun:test expect().toContain bug

The Bun Shell is a cross-platform shell that allows you to run shell scripts in JavaScript & TypeScript

Fixes 40 bugs (addressing 194 👍 reactions). import & embed sqlite databases in Bun, Resource Management ('using' TC39 stage3) support, bundler improvements when building for Node.js, bugfix for peer dependency resolution, semver bugfix, 4% faster TCP on linux, Node.js compatibility improvements and more

Fixes bun install issues on Vercel, adds performance.mark() APIs, adds child_process support for extra pipes, makes Buffer.concat 10% - 400% faster, adds toBeEmptyObject and toContainKeys matchers, fixes console.table width using emojis, and adds support for argv and execArgv options in worker_threads.

Fixes 33 bugs (addressing 80 👍 reactions). console.table() support. Bun.write, Bun.file, and bun:sqlite use less memory. Large file uploads with FormData use less memory. bun:sqlite error messages get more detailed. Memory leak in errors from node:fs fixed. Node.js compatibility improvements, and many crashes fixed

Reduced memory usage for fs.readlink, fs.writeFile, fs.stat and HTMLRewriter. Fixes a regression where setTimeout caused high CPU usage on Linux. Bun.spawn shows how much CPU & memory the process used. HTMLRewriter.transform now supports strings and ArrayBuffer. fs.writeFile() and fs.readFile() now support hex & base64 encodings

Fixes 26 bugs (addressing 92 👍 reactions). Use @types/bun instead of bun-types. Fixes --frozen-lockfile bug. bcrypt & argon2 packages now work. setTimeout & setInterval get 4x higher throughput. module mocks in bun:test resolve specifiers. Optimized spawnSync() for large stdio on Linux. Bun.peek() gets 90x faster, expect(map1).toEqual(map2) gets 100x faster. Bugfixes to NAPI, bun install, and Node.js compatibility improvements

Fixes 27 bugs (addressing 28 👍 reactions). A hang impacting create-vite & create-next & stdin has been fixed. Lifecycle scripts reporting "node" or "node-gyp" not found has been fixed. expect().rejects works like Jest now, and more bug fixes

Fixes 15 bugs (addressing 152 👍 reactions). bun install postinstall scripts run for top 500 packages, bunx supabase starts 30x faster than npx supabase, bunx esbuild starts 50x faster than npx esbuild and bugfixes to bun install

Fixes 49 bugs (addressing 38 👍 reactions). Concurrent IO for Bun.file & Bun.write gets 3x faster and now supports Google Cloud Run & Vercel, Bun.write auto-creates the parent directory if it doesn't exist, expect.extend inside of preload works, napi_create_object gets 2.5x faster, bugfix for module resolution impacting Astro v4 and p-limit, console.log bugfixes

Fixes 23 bugs (addressing 117 👍 reactions), tsc starts 2x faster, prettier 40% faster. Stable WebSocket client, syntax-highlighted errors, cleaner stack traces, add custom test matchers with expect.extend(), TensorFlow.js support, fs.readdir recursive is 40x faster than in Node, and more.

Introduces Bun.Glob - a fast glob matcher, fixes a race condition when extracting dependencies during bun install, improves TypeScript module resolution in node_modules, makes error messages easier to read, and more fixes.

Fixes 6 bugs (addressing 317 👍 reactions). 'http2' module & gRPC.js work now. Vite 5 & Rollup 4 work. Implements process.report.getReport(), improves support for ES5 'with' statements, fixes a regression in bun install, fixes a crash when printing exceptions, fixes a Bun.spawn bug, and fixes a peer dependencies bug

Fixes 24 bugs, makes bun's CLI help menus easier to read, adds support for bun -e, bun --env-file, server.url, import.meta.env, expect.unreachable(), improves support for module mocks, allows importing builtin modules at bundle-time, and improves Node.js compatibility

Fixes 5 bugs, adds Bun.semver, fixes a bug in bun install and fixes bugs impacting astro and @google-cloud/storage

Fixes 14 bugs (addressing 102 👍 reactions), node:http gets 14% faster, stability improvements to Bun for Linux ARM64, bun install bugfix, and node:http bugfixes

Fixes a glibc symbol version error, illegal instruction error, a Bun.spawn bug, an edgecase with peer dependency installs, and a JSX transpiler bugfix

Fixes 138 bugs (addressing 257 👍 reactions), makes require() use 30% less memory, adds module mocking to bun test, and improves reliability of bun install and Bun.spawn

Fixes 59 bugs (addressing 78 👍 reactions), support for optional peerDependencies, improvements to Node.js compatibility, and more stability for bun install.

Fixes 3 bugs (addressing 85 👍 reactions), implements support for the 'overrides' & 'resolutions' fields in package.json and a regression impacting Docker usage with Bun

Fixes 41 bugs + a memory leak in fetch(), KeyObject support in crypto module, import package-lock.json, install peer dependencies, bun pm migrate subcommand, bun install bugfixes, and toEqualIgnoringWhitespace matcher in bun:test

Bun v1.0.4 fixes 62 bugs, adds server.requestIP, supports virtual modules in runtime plugins, fixes many bun install bugs, and reduces memory consumption in Bun.serve()

emitDecoratorMetadata, Nest.js support, better private registry support, bunx bugfix, console.log() depth 8 -> 2, silence .env loaded message, and many bugfixes

Faster watch mode, bunx @latest bugfix, Bun uses V8's date parser, bugfixes to node:readline, node:dns, bun run, http streaming, transpiler, node:tty and more

Named imports for .json & .toml files, bugfixes to bun install, node:path, Buffer. Support for NODE_TLS_REJECT_UNAUTHORIZED=0

Bun is stable and ready for production.

Bun.serve() gets unix domain socket support, a performance regression has been fixed, and bugs in bun install, node:http and napi have been fixed

Bun gets debugger support, fetch streaming, and bun update. ReadStream and WriteStream from node:tty are implemented, including raw mode on process.stdin. SvelteKit now works in Bun. Plus bug fixes and stability improvements.

bun test gets code coverage reporting. bun test -t pattern lets you filter tests to run by regex pattern. Fixes a crash in bun:sqlite, node.js compatiblity improvements, and more.

worker_threads, BroadcastChannel, diagnostics_channel, Node.js compatibility improvements, bun ., bugfixes and 2 memory leaks fixed

Node.js compatibility improvements for Vite & frameworks. Better workspace support in bun installl & a bugfix for private registries. ES Modules load 30% faster. vite dev starts 90% faster on Linux. Transpiler bugfixes. fetch() file urls. MessagePort & MessageChannel.

vite dev support, Workers, bun --smol, WebSocket.ping(), structuredClone(), serialize() and better Node.js compatibility

Better support for Node.js process and lots of fixed bugs.

Mock Date, 10x faster base64 encoding, WebSocket client reliability improvements, support for postgres tls and nodemailer, and various bug fixes.

CommonJS is here to stay, and that's okay. Better tooling will solve today's developer experience issues.

Sourcemapped stack traces at runtime, Node.js compatibility improvements, Bun.file(path).exists, minifier and bundler bugfixes

Reduced memory usage, fs.watch(), better CommonJS support, improvements to bun test, bun install, and many bugfixes.

Memory usage reductions in Bun.serve(), bun install, module imports, and crypto hashing. Crash in CommonJS modules fixed, plus additional bugfixes.

Password hashing, function mocking, debugging, and bug squashing

Discord.js, Prisma, and Puppeteer support, faster node:crypto hashing, and lots of bug fixes

Lots of improvements to bun test, including Github Actions support, bun test --only, test.if(), describe.skip(), and more matchers

Call JavaScript functions at bundle-time and inline results into the AST

Native CommonJS support, $npm_lifecycle_event, bugfix for Bun.serve() with streaming files, bugfix for Node.js createConnection and a bundler bugfix

Up to 80% faster bun test, test timeouts, timezone support, bundler bugfixes, console.log() improvements, node:http bugfixes, and more

Introducing node:vm support, support for socket.io and mongodb, test.todo(), and many bug fixes for the bundler.

Up to 20% faster JSON.parse, 15% faster JSON.stringify, and Proxy gets faster. A couple bugfixes to the minifier and bundler

The Bun toolkit gets a new addition. Bun's fast native bundler is now in beta.

A new JavaScript bundler, standalone executables, and lots of new features and improvements

Introducing watch mode using bun --watch, tarball dependencies in bun install, and lots of bug fixes and compatibility improvements.

Introducing expect() snapshots in bun test, preloading modules using bun --preload, basic glob star support in bun install, improvements to Web & Node.js compatibility, lots of bug fixes, and a teaser of what's next.

Bun has docs now? Bun has docs now.

Support for FormData and git dependencies, better setTimeout() compatibility, bun wiptest is now bun test, and better support on AWS Lambda and GitHub Actions.

Support for Bun.sleep, improved Docker support, and improvements to Node.js and npm compatibility

Improved compatibility for node:http, support for http.request() and stripe-node, and fixed various bugs.

MongoDB support, github: dependencies in bun install, faster Buffer, bun run for WebAssembly, express' body-parser package, and many bug fixes.

Support for aliasing package.json dependencies, a better error message when a workspace is not found, and a few important bug fixes.

Support for npm workspaces, DNS lookups, database drivers, and lots of improvements to bun install.

Introducing bunx. Install and run an executable from npm, 100x faster than npx.

Massive reduction in memory usage, faster text encoding, improved Jest compatibility, file-system routing, automatic package installs, and a lot more

Release notes for Bun v0.2.2

Release notes for Bun v0.2.1

Release notes for Bun v0.2.0

Release notes for Bun v0.1.12

Release notes for Bun v0.1.11

Release notes for Bun v0.1.10

Release notes for Bun v0.1.9

Release notes for Bun v0.1.8

Release notes for Bun v0.1.7

Release notes for Bun v0.1.6

Release notes for Bun v0.1.5

Release notes for Bun v0.1.4

Release notes for Bun v0.1.3

Release notes for Bun v0.1.2

Release notes for Bun v0.1.1