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Rewriting Bun in Rust
Why & how we rewrote Bun from Zig to Rust
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Bun v1.3.14
Fixes 92 issues (addressing 380 👍). Bun.Image — a built-in image processing API, 7x faster warm installs with the isolated linker's global store, experimental HTTP/2 and HTTP/3 clients for fetch(), HTTP/3 (QUIC) in Bun.serve(), rewritten fs.watch() on Linux and macOS, --no-orphans CLI flag, process.execve(), Bun.Terminal on Windows via ConPTY, FreeBSD and Android builds, shared SSL_CTX cache, smal…
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Bun v1.3.13
Fixes 82 issues (addressing 381 👍). bun test --parallel, --isolate, --shard, and --changed, bun install streams tarballs to disk using 17x less memory, source maps use 8x less memory, 5.5x faster gzip with zlib-ng, Range request support in Bun.serve(), SHA3 in node:crypto and WebCrypto, ws+unix:// WebSocket client, and many bugfixes and Node.js compatibility improvements
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Bun v1.3.12
Fixes 120 issues (addressing 219 👍). Render Markdown in the terminal with bun ./file.md, Bun.WebView headless browser automation, in-process Bun.cron() scheduler, async stack traces for native errors, 2.3x faster URLPattern, 2x faster Bun.Glob.scan, cgroup-aware parallelism on Linux, and many bugfixes and Node.js compatibility improvements.
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Bun v1.3.11
Fixes 105 issues (addressing 307 👍). 4 MB smaller on Linux. x64 Bun.cron for OS-level cron jobs and expression parsing, Bun.sliceAnsi for ANSI/grapheme-aware string slicing, richer Bun.markdown list metadata; bun test --path-ignore-patterns; native Windows ARM64 .bin shim; dgram UDP fixed on macOS, fs.openSync numeric flags fixed on Windows (unbreaks tar@7), http2 WINDOW_UPDATE fix; bundler --byte…
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Bun v1.3.10
Fixes 155 issues (addressing 642 👍). New native REPL, --compile --target=browser for self-contained HTML, TC39 standard ES decorators, Windows ARM64 support, barrel import optimization, and a faster event loop. structuredClone up to 25x faster for arrays, Buffer.slice() 1.8x faster, path.parse() up to 7x faster, fewer closures in bundled output, and upgraded JavaScriptCore with 168x faster deep ro…
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Bun v1.3.9
Fixes 23 issues (addressing 13 👍). Run multiple scripts in --parallel or --sequential. bun:test mock & spyOn get Symbol.dispose support. ESM bytecode compilation. Faster Bun.markdown. Faster RegExp, String.prototype.trim, String.prototype.startsWith.
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Bun v1.3.8
Fixes 8 issues (addressing 6 👍). Bun.markdown is a builtin CommonMark-compliant Markdown parser written in Zig. Bun's bundler gets bun build --metafile-md to write LLM-friendly module graph metadata. Fixes a regression in 'npm install -g bun' on Windows.
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Bun v1.3.7
Fixes 91 issues (addressing 243 👍). 50% faster `Buffer.from(array)`, 35% faster async/await, 3x faster `array.flat()`, 90% faster `padStart`/`padEnd` via JSC upgrade. New: `Bun.JSON5`, `Bun.JSONL`, `Bun.wrapAnsi()` (33-88x faster than wrap-ansi npm), `--heap-prof-md`, `--cpu-prof-md`, `node:inspector` Profiler API, `replMode` for `Bun.Transpiler`. Fetch now preserves header casing. HTTP/2 fixes fo…
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Bun v1.3.6
Fixes 45 issues (addressing 125 👍). Bun.Archive API for creating & extracting tarballs with gzip compression, Bun.JSONC for parsing JSON with comments, metafile & files options in Bun.build for bundle analysis and virtual files, Response.json() 3.5x faster, 15% faster async/await, 30% faster Promise.race, 20x faster Bun.hash.crc32, faster Buffer.indexOf/includes with SIMD, HTTP/HTTPS proxy support…
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Bun v1.3.5
Fixes 32 issues (addressing 25 👍). Bun.Terminal API, compile-time feature flags, improved Bun.stringWidth accuracy, V8 C++ value type checking APIs, Content-Disposition support for S3 uploads, environment variable expansion in .npmrc quoted values, and numerous bug fixes & node.js compatibility improvements
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Bun v1.3.4
Fixes 194 issues (addressing 412 👍). URLPattern API, Fake Timers for bun:test, Custom Proxy Headers in fetch(),console.log %j format, http.Agent connection pooling fix, Standalone executable config loading changes, SQLite 3.51.1, and numerous bugfixes for bun:test, Node.js compatibility, Windows, Web APIs, bun install, and more
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Bun is joining Anthropic
Bun has been acquired by Anthropic. Anthropic is betting on Bun as the infrastructure powering Claude Code, Claude Agent SDK, and future AI coding products & tools.
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Bun v1.3.3
Fixes 95 issues (addressing 348 👍). CompressionStream and DecompressionStream, Control .env and bunfig.toml loading in standalone executables, `retry` and `repeats` in `bun:test`, --no-env-file, SQLite 3.51.0, Upgraded to Zig 0.15.2, Bugfixes for bundler, bun install, Windows, Node.js compatibility, Web APIs, Bun.serve, networking, Bun.YAML, Bun.Transpiler, Bun.spawn & TypeScript definitions
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Bun v1.3.2
Fixes 287 issues (addressing 324 👍). Hoisted installs restored as default for backward compatibility. CPU profiling with --cpu-prof, faster installs for packages with post-install scripts, bun:test onTestFinished hook, ServerWebSocket subscriptions getter, Alpine 3.22 in Docker images, improved Git dependency resolution, bun list alias, and numerous bug fixes across install, HTTP/HTTPS, N-API, bun…
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Vercel now supports the Bun Runtime
Deploy and run your applications with Bun's fast JavaScript runtime on Vercel Functions, with full access to Bun APIs and improved performance
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Bun v1.3.1
Fixes 103 issues (addressing 172 👍). 2× faster bun build on macOS for symlink-heavy projects, source maps preserve legal comments, and --format=cjs now inlines import.meta; bun test adds global vi, --pass-with-no-tests, and --only-failures; .npmrc :email auth support, faster installs when no peer deps, selective hoisting for isolated installs (publicHoistPattern/hoistPattern), and fs/promises File…
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Bun 1.3
Bun 1.3 introduces zero-config frontend development, unified SQL API, built-in Redis client, security enhancements, package catalogs, async stack traces, VS Code test integration, and Node.js compatibility improvements.
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Bun v1.2.23
Fixes 119 issues (addressing 412 👍). pnpm-lock.yaml migration for seamless switching from pnpm to bun install, Redis Pub/Sub support, concurrent test execution with configurable parallelism, platform-specific dependency filtering with --cpu and --os flags, system CA certificates support with --use-system-ca, Windows code signing for compiled executables, JSX configuration improvements in Bun.build…
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Bun v1.2.22
Fixes 144 issues (addressing 257 👍). Async stack traces for better debugging, RFC 6455 compliant WebSocket client subprotocol negotiation, MySQL adapter improvements including affectedRows and lastInsertRowid support, JSX side effects preservation during bundling, event loop delay monitoring with perf_hooks, HTTP server idle connection management, --workspaces in bun run, function name removal dur…
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Behind The Scenes of Bun Install
Learn how Bun is able to cut install times by up to 25×. Bun skips Node.js's overhead with direct system calls, cache-friendly data layouts, OS-level copy-on-write, and full-core parallelism.
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Bun v1.2.21
Fixes 69 issues (addressing 204 👍). Bun.SQL now supports MySQL and SQLite, alongside PostgreSQL. Native YAML support. 500x faster postMessage(string). Bun.build() compile API, with cross-platform targets. Reduced idle CPU usage. Bun.stripANSI for SIMD-accelerated ANSI escape removal. bunx --package flag support. customizable User-Agent headers. Windows executable metadata embedding. and extensive…
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500x faster postMessage(string)
Zero-copy postMessage(string)
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Bun v1.2.20
Fixes 141 issues (addressing 429 👍). Reduced idle CPU usage. Improved `bun:test` diffing. Automatic `ETag` and `If-None-Match` in static routes for `Bun.serve`. 40x faster `AbortSignal.timeout`. Windows long path support. `WebAssembly.compileStreaming` and `WebAssembly.instantiateStreaming`. Many, many reliability improvements.
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Bun v1.2.19
Fixes 163 issues (addressing 1,043 👍). Introduces `bun install --linker=isolated` for pnpm-style isolated node_modules, `bun why` for dependency tree understanding, `bun pm pkg` commands for package.json management, enhanced `node:fs.glob()` with array patterns and exclude options, `node:module.SourceMap` class and `findSourceMap()`, smarter `@types/bun` with automatic Node.js compatibility detect…
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Bun v1.2.18
Fixes 52 issues (addressing 112 👍). ReadableStream text(), json(), bytes(), blob(), WebSocket client compression with `permessage-deflate`, `bun pm version`, reduced memory usage for large `fetch()` and `S3` uploads, faster `napi_create_buffer`, faster sliced string handling in native addons, `fs.glob` now matches directories by default, `net.createConnection()` now validates `options.host`, `http…
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Bun v1.2.17
Fixes 50 issues (addressing 80 👍), and adds +24 passing Node.js tests. Ahead-of-time bundling for HTML imports, more reliable Bun Shell, `setTimeout` and `setImmediate` use 8-15% less memory, `columnTypes` & `declaredTypes` in `bun:sqlite`, `bun info` is the new `bun pm view`, Node.js compatibility improvements to `child_process.fork`, `fs.glob` options are now optional, `tls.getCACertificates()`…
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Bun v1.2.16
Fixes 73 issues (addressing 124 👍), and adds +119 passing Node.js tests. Serve files with `Bun.serve` through `routes`, `install.linkWorkspacePackages` option in `bunfig.toml`, `bun outdated` support for catalogs, `Bun.hash.rapidhash`, `node:net` compatibility, `vm.SyntheticModule` support, `HTTPParser` binding, and memory leak fixes.
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Bun v1.2.15
Fixes 11 issues (addressing 261 👍). bun audit scans dependencies for security vulnerabilities, bun pm view shows package metadata from npm. bun init adds a Cursor rule to use Bun instead of Node.js/Vite/npm/pnpm, `node:vm SourceTextModule` and `node:perf_hooks createHistogram` are now implemented.
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Bun v1.2.14
Fixes 39 issues (addressing 179 👍). Adds support for catalogs in bun install, --react flag for bun init, improved HTTP routing with method-specific routes, better TypeScript default module settings, fixes a HTTPS proxy issue impacting Codex, and several Node.js compatibility improvements including worker_threads reliability enhancements and http2 server improvements.