mirror of
https://github.com/oven-sh/bun
synced 2026-02-09 10:28:47 +00:00
461 lines
15 KiB
Markdown
461 lines
15 KiB
Markdown
Every day, Bun gets closer to 100% Node.js API compatibility. Popular projects like Next.js, Express, and millions of `npm` packages intended for Node.js just work with Bun out of the box.
|
|
|
|
This page is updated regularly to reflect compatibility status of the latest version of Bun. The information below reflects Bun's compatibility with _Node.js v23_. If you run into any bugs with a particular package, please [open an issue](https://bun.sh/issues). Opening issues for compatibility bugs helps us prioritize what to work on next.
|
|
|
|
## Built-in modules
|
|
|
|
### [`node:assert`](https://nodejs.org/api/assert.html)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`node:buffer`](https://nodejs.org/api/buffer.html)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`node:console`](https://nodejs.org/api/console.html)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`node:diagnostics_channel`](https://nodejs.org/api/diagnostics_channel.html)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`node:dns`](https://nodejs.org/api/dns.html)
|
|
|
|
🟢 Fully implemented. > 90% of Node.js's test suite passes.
|
|
|
|
### [`node:events`](https://nodejs.org/api/events.html)
|
|
|
|
🟢 Fully implemented. `EventEmitterAsyncResource` uses `AsyncResource` underneath. > 90% of Node.js's test suite passes.
|
|
|
|
### [`node:http`](https://nodejs.org/api/http.html)
|
|
|
|
🟢 Fully implemented. Outgoing client request body is currently buffered instead of streamed.
|
|
|
|
### [`node:https`](https://nodejs.org/api/https.html)
|
|
|
|
🟢 APIs are implemented, but `Agent` is not always used yet.
|
|
|
|
### [`node:os`](https://nodejs.org/api/os.html)
|
|
|
|
🟢 Fully implemented. 100% of Node.js's test suite passes.
|
|
|
|
### [`node:path`](https://nodejs.org/api/path.html)
|
|
|
|
🟢 Fully implemented. 100% of Node.js's test suite passes.
|
|
|
|
### [`node:punycode`](https://nodejs.org/api/punycode.html)
|
|
|
|
🟢 Fully implemented. 100% of Node.js's test suite passes, _deprecated by Node.js_.
|
|
|
|
### [`node:querystring`](https://nodejs.org/api/querystring.html)
|
|
|
|
🟢 Fully implemented. 100% of Node.js's test suite passes.
|
|
|
|
### [`node:readline`](https://nodejs.org/api/readline.html)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`node:string_decoder`](https://nodejs.org/api/string_decoder.html)
|
|
|
|
🟢 Fully implemented. 100% of Node.js's test suite passes.
|
|
|
|
### [`node:timers`](https://nodejs.org/api/timers.html)
|
|
|
|
🟢 Recommended to use global `setTimeout`, et. al. instead.
|
|
|
|
### [`node:tty`](https://nodejs.org/api/tty.html)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`node:url`](https://nodejs.org/api/url.html)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`node:zlib`](https://nodejs.org/api/zlib.html)
|
|
|
|
🟢 Fully implemented. 98% of Node.js's test suite passes.
|
|
|
|
### [`node:async_hooks`](https://nodejs.org/api/async_hooks.html)
|
|
|
|
🟡 Only `AsyncLocalStorage`, and `AsyncResource` are implemented. `AsyncResource` is missing `bind`.
|
|
|
|
### [`node:async_hooks`](https://nodejs.org/api/async_hooks.html)
|
|
|
|
🟡 Only `AsyncLocalStorage`, and `AsyncResource` are implemented. `AsyncResource` is missing `bind`.
|
|
|
|
### [`node:child_process`](https://nodejs.org/api/child_process.html)
|
|
|
|
🟡 Missing `proc.gid` `proc.uid`. `Stream` class not exported. IPC cannot send socket handles. Node.js <> Bun IPC can be used with JSON serialization.
|
|
|
|
### [`node:cluster`](https://nodejs.org/api/cluster.html)
|
|
|
|
🟡 Handles and file descriptors cannot be passed between workers, which means load-balancing HTTP requests across processes is only supported on Linux at this time (via `SO_REUSEPORT`). Otherwise, implemented but not battle-tested.
|
|
|
|
### [`node:crypto`](https://nodejs.org/api/crypto.html)
|
|
|
|
🟡 Missing `Certificate` `ECDH` `X509Certificate` `checkPrime` `checkPrimeSync` `diffieHellman` `generatePrime` `generatePrimeSync` `getCipherInfo` `getFips` `hkdf` `hkdfSync` `secureHeapUsed` `setEngine` `setFips`
|
|
|
|
Some methods are not optimized yet.
|
|
|
|
### [`node:dgram`](https://nodejs.org/api/dgram.html)
|
|
|
|
🟡 Missing `setBroadcast` `setTTL` `setMulticastTTL` `setMulticastLoopback` `setMulticastInterface` `addMembership` `dropMembership`
|
|
`addSourceSpecificMembership` `dropSourceSpecificMembership`
|
|
|
|
### [`node:domain`](https://nodejs.org/api/domain.html)
|
|
|
|
🟡 Missing `Domain` `active`
|
|
|
|
### [`node:fs`](https://nodejs.org/api/fs.html)
|
|
|
|
🟡 Missing `statfs` `statfsSync`, `opendirSync`. `Dir` is partially implemented.
|
|
|
|
### [`node:http2`](https://nodejs.org/api/http2.html)
|
|
|
|
🟡 Client & server are implemented (95.25% of gRPC's test suite passes). Missing `options.allowHTTP1`, `options.enableConnectProtocol`, ALTSVC extension, and `http2stream.pushStream`.
|
|
|
|
### [`node:module`](https://nodejs.org/api/module.html)
|
|
|
|
🟡 Missing `runMain` `syncBuiltinESMExports`, `Module#load()`. Overriding `require.cache` is supported for ESM & CJS modules. `module._extensions`, `module._pathCache`, `module._cache` are no-ops. `module.register` is not implemented and we recommend using a [`Bun.plugin`](https://bun.sh/docs/runtime/plugins) in the meantime.
|
|
|
|
### [`node:net`](https://nodejs.org/api/net.html)
|
|
|
|
🟡 `SocketAddress` class not exposed (but implemented). `BlockList` exists but is a no-op.
|
|
|
|
### [`node:perf_hooks`](https://nodejs.org/api/perf_hooks.html)
|
|
|
|
🟡 Missing `createHistogram` `monitorEventLoopDelay`. It's recommended to use `performance` global instead of `perf_hooks.performance`.
|
|
|
|
### [`node:process`](https://nodejs.org/api/process.html)
|
|
|
|
🟡 See [`process`](#process) Global.
|
|
|
|
### [`node:stream`](https://nodejs.org/api/stream.html)
|
|
|
|
🟡 Missing `getDefaultHighWaterMark` `setDefaultHighWaterMark` `toWeb`
|
|
|
|
### [`node:sys`](https://nodejs.org/api/util.html)
|
|
|
|
🟡 See [`node:util`](#node-util).
|
|
|
|
### [`node:tls`](https://nodejs.org/api/tls.html)
|
|
|
|
🟡 Missing `tls.createSecurePair`.
|
|
|
|
### [`node:util`](https://nodejs.org/api/util.html)
|
|
|
|
🟡 Missing `MIMEParams` `MIMEType` `debug` `getSystemErrorMap` `transferableAbortController` `transferableAbortSignal` `stripVTControlCharacters`
|
|
|
|
### [`node:v8`](https://nodejs.org/api/v8.html)
|
|
|
|
🟡 `writeHeapSnapshot` and `getHeapSnapshot` are implemented. `serialize` and `deserialize` use JavaScriptCore's wire format instead of V8's. Other methods are not implemented. For profiling, use [`bun:jsc`](https://bun.sh/docs/project/benchmarking#bunjsc) instead.
|
|
|
|
### [`node:vm`](https://nodejs.org/api/vm.html)
|
|
|
|
🟡 Core functionality works, but experimental VM ES modules are not implemented, including `vm.Module`, `vm.SourceTextModule`, `vm.SyntheticModule`,`importModuleDynamically`, and `vm.measureMemory`. Options like `timeout`, `breakOnSigint`, `cachedData` are not implemented yet.
|
|
|
|
### [`node:wasi`](https://nodejs.org/api/wasi.html)
|
|
|
|
🟡 Partially implemented.
|
|
|
|
### [`node:worker_threads`](https://nodejs.org/api/worker_threads.html)
|
|
|
|
🟡 `Worker` doesn't support the following options: `stdin` `stdout` `stderr` `trackedUnmanagedFds` `resourceLimits`. Missing `markAsUntransferable` `moveMessagePortToContext` `getHeapSnapshot`.
|
|
|
|
### [`node:inspector`](https://nodejs.org/api/inspector.html)
|
|
|
|
🔴 Not implemented.
|
|
|
|
### [`node:repl`](https://nodejs.org/api/repl.html)
|
|
|
|
🔴 Not implemented.
|
|
|
|
### [`node:test`](https://nodejs.org/api/test.html)
|
|
|
|
🔴 Not implemented. Use [`bun:test`](https://bun.sh/docs/cli/test) instead.
|
|
|
|
### [`node:trace_events`](https://nodejs.org/api/tracing.html)
|
|
|
|
🔴 Not implemented.
|
|
|
|
## Globals
|
|
|
|
The table below lists all globals implemented by Node.js and Bun's current compatibility status.
|
|
|
|
### [`AbortController`](https://developer.mozilla.org/en-US/docs/Web/API/AbortController)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`AbortSignal`](https://developer.mozilla.org/en-US/docs/Web/API/AbortSignal)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`Blob`](https://developer.mozilla.org/en-US/docs/Web/API/Blob)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`Buffer`](https://nodejs.org/api/buffer.html#class-buffer)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`ByteLengthQueuingStrategy`](https://developer.mozilla.org/en-US/docs/Web/API/ByteLengthQueuingStrategy)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`__dirname`](https://nodejs.org/api/globals.html#__dirname)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`__filename`](https://nodejs.org/api/globals.html#__filename)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`atob()`](https://developer.mozilla.org/en-US/docs/Web/API/atob)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`BroadcastChannel`](https://developer.mozilla.org/en-US/docs/Web/API/BroadcastChannel)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`btoa()`](https://developer.mozilla.org/en-US/docs/Web/API/btoa)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`clearImmediate()`](https://developer.mozilla.org/en-US/docs/Web/API/Window/clearImmediate)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`clearInterval()`](https://developer.mozilla.org/en-US/docs/Web/API/Window/clearInterval)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`clearTimeout()`](https://developer.mozilla.org/en-US/docs/Web/API/Window/clearTimeout)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`CompressionStream`](https://developer.mozilla.org/en-US/docs/Web/API/CompressionStream)
|
|
|
|
🔴 Not implemented.
|
|
|
|
### [`console`](https://developer.mozilla.org/en-US/docs/Web/API/console)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`CountQueuingStrategy`](https://developer.mozilla.org/en-US/docs/Web/API/CountQueuingStrategy)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`Crypto`](https://developer.mozilla.org/en-US/docs/Web/API/Crypto)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`SubtleCrypto (crypto)`](https://developer.mozilla.org/en-US/docs/Web/API/crypto)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`CryptoKey`](https://developer.mozilla.org/en-US/docs/Web/API/CryptoKey)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`CustomEvent`](https://developer.mozilla.org/en-US/docs/Web/API/CustomEvent)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`DecompressionStream`](https://developer.mozilla.org/en-US/docs/Web/API/DecompressionStream)
|
|
|
|
🔴 Not implemented.
|
|
|
|
### [`Event`](https://developer.mozilla.org/en-US/docs/Web/API/Event)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`EventTarget`](https://developer.mozilla.org/en-US/docs/Web/API/EventTarget)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`exports`](https://nodejs.org/api/globals.html#exports)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`fetch`](https://developer.mozilla.org/en-US/docs/Web/API/fetch)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`FormData`](https://developer.mozilla.org/en-US/docs/Web/API/FormData)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`global`](https://nodejs.org/api/globals.html#global)
|
|
|
|
🟢 Implemented. This is an object containing all objects in the global namespace. It's rarely referenced directly, as its contents are available without an additional prefix, e.g. `__dirname` instead of `global.__dirname`.
|
|
|
|
### [`globalThis`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/globalThis)
|
|
|
|
🟢 Aliases to `global`.
|
|
|
|
### [`Headers`](https://developer.mozilla.org/en-US/docs/Web/API/Headers)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`MessageChannel`](https://developer.mozilla.org/en-US/docs/Web/API/MessageChannel)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`MessageEvent`](https://developer.mozilla.org/en-US/docs/Web/API/MessageEvent)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`MessagePort`](https://developer.mozilla.org/en-US/docs/Web/API/MessagePort)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`module`](https://nodejs.org/api/globals.html#module)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`PerformanceEntry`](https://developer.mozilla.org/en-US/docs/Web/API/PerformanceEntry)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`PerformanceMark`](https://developer.mozilla.org/en-US/docs/Web/API/PerformanceMark)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`PerformanceMeasure`](https://developer.mozilla.org/en-US/docs/Web/API/PerformanceMeasure)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`PerformanceObserver`](https://developer.mozilla.org/en-US/docs/Web/API/PerformanceObserver)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`PerformanceObserverEntryList`](https://developer.mozilla.org/en-US/docs/Web/API/PerformanceObserverEntryList)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`PerformanceResourceTiming`](https://developer.mozilla.org/en-US/docs/Web/API/PerformanceResourceTiming)
|
|
|
|
🔴 Not implemented.
|
|
|
|
### [`performance`](https://developer.mozilla.org/en-US/docs/Web/API/performance)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`process`](https://nodejs.org/api/process.html)
|
|
|
|
🟡 Missing `initgroups` `allowedNodeEnvironmentFlags` `getActiveResourcesInfo` `setActiveResourcesInfo` `moduleLoadList` `setSourceMapsEnabled`. `process.binding` is partially implemented.
|
|
|
|
### [`queueMicrotask()`](https://developer.mozilla.org/en-US/docs/Web/API/queueMicrotask)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`ReadableByteStreamController`](https://developer.mozilla.org/en-US/docs/Web/API/ReadableByteStreamController)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`ReadableStream`](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`ReadableStreamBYOBReader`](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStreamBYOBReader)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`ReadableStreamBYOBRequest`](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStreamBYOBRequest)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`ReadableStreamDefaultController`](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStreamDefaultController)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`ReadableStreamDefaultReader`](https://developer.mozilla.org/en-US/docs/Web/API/ReadableStreamDefaultReader)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`require()`](https://nodejs.org/api/globals.html#require)
|
|
|
|
🟢 Fully implemented, including [`require.main`](https://nodejs.org/api/modules.html#requiremain), [`require.cache`](https://nodejs.org/api/modules.html#requirecache), [`require.resolve`](https://nodejs.org/api/modules.html#requireresolverequest-options)
|
|
|
|
### [`Response`](https://developer.mozilla.org/en-US/docs/Web/API/Response)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`Request`](https://developer.mozilla.org/en-US/docs/Web/API/Request)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`setImmediate()`](https://developer.mozilla.org/en-US/docs/Web/API/Window/setImmediate)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`setInterval()`](https://developer.mozilla.org/en-US/docs/Web/API/Window/setInterval)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`setTimeout()`](https://developer.mozilla.org/en-US/docs/Web/API/Window/setTimeout)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`structuredClone()`](https://developer.mozilla.org/en-US/docs/Web/API/structuredClone)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`SubtleCrypto`](https://developer.mozilla.org/en-US/docs/Web/API/SubtleCrypto)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`DOMException`](https://developer.mozilla.org/en-US/docs/Web/API/DOMException)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`TextDecoder`](https://developer.mozilla.org/en-US/docs/Web/API/TextDecoder)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`TextDecoderStream`](https://developer.mozilla.org/en-US/docs/Web/API/TextDecoderStream)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`TextEncoder`](https://developer.mozilla.org/en-US/docs/Web/API/TextEncoder)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`TextEncoderStream`](https://developer.mozilla.org/en-US/docs/Web/API/TextEncoderStream)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`TransformStream`](https://developer.mozilla.org/en-US/docs/Web/API/TransformStream)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`TransformStreamDefaultController`](https://developer.mozilla.org/en-US/docs/Web/API/TransformStreamDefaultController)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`URL`](https://developer.mozilla.org/en-US/docs/Web/API/URL)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`URLSearchParams`](https://developer.mozilla.org/en-US/docs/Web/API/URLSearchParams)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`WebAssembly`](https://nodejs.org/api/globals.html#webassembly)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`WritableStream`](https://developer.mozilla.org/en-US/docs/Web/API/WritableStream)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`WritableStreamDefaultController`](https://developer.mozilla.org/en-US/docs/Web/API/WritableStreamDefaultController)
|
|
|
|
🟢 Fully implemented.
|
|
|
|
### [`WritableStreamDefaultWriter`](https://developer.mozilla.org/en-US/docs/Web/API/WritableStreamDefaultWriter)
|
|
|
|
🟢 Fully implemented.
|