Node API Compatibility List

Deno provides polyfills for a number of built-in Node.js modules and globals. Node compatibility is an ongoing project - help us identify gaps and let us know which modules you need by opening an issue on GitHub.

Fully supported built-in modules

• node:assert
• node:assert/strict
• node:buffer
• node:console
• node:dgram
• node:diagnostics_channel
• node:events
• node:module
• node:os
• node:path, node:path/posix, node:path/win32
• node:punycode
• node:querystring
• node:readline
• node:stream, node:stream/consumers, node:stream/promises, node:stream/web
• node:sys
• node:timers, node:timers/promises
• node:url
• node:util, node:util/types

Partially supported built-in modules

ℹ️ = Partial support   ❌ = Stubs only

node:async_hooks

ℹ️

AsyncLocalStorage is supported. AsyncResource, executionAsyncId, and createHook are non-functional stubs.

Node.js docs

node:child_process

ℹ️

The ipc and overlapped stdio options are missing. Passing file descriptors by an integer value is missing.

Node.js docs

node:cluster

❌

All exports are non-functional stubs.

Node.js docs

node:crypto

ℹ️

Missing Certificate class, crypto.Cipheriv.prototype.setAutoPadding, crypto.Decipheriv.prototype.setAutoPadding, crypto.getCipherInfo, crypto.publicDecrypt, crypto.ECDH.prototype.convertKey, crypto.diffieHellman, x448 option for generateKeyPair, crypto.KeyObject, safe, add and rem options for generatePrime, crypto.Sign.prototype.sign and crypto.Verify.prototype.verify with non BinaryLike input, crypto.secureHeapUsed, crypto.setEngine, legacy methods of crypto.X509Certificate.

Node.js docs

node:dns

ℹ️

Missing dns.resolve* with ttl option.

Node.js docs

node:domain

❌

All exports are non-functional stubs.

Node.js docs

node:fs, node:fs/promises

ℹ️

node:fs

Missing utf16le, latin1 and ucs2 encoding for fs.writeFile and fs.writeFileSync. Missing Dirent.isBlockDevice, Dirent.isCharacterDevice, Dirent.isFIFO, Dirent.isSocket, FSWatcher.ref, FSWatcher.unref.

node:fs/promises

Missing lchmod, lchown, lutimes.

Node.js docs

node:http

ℹ️

createConnection option is currently not supported.

Node.js docs

node:http2

ℹ️

Partially supported, major work in progress to enable grpc-js.

Node.js docs

node:https

ℹ️

Missing https.Server.opts.cert and https.Server.opts.key array type.

Node.js docs

node:inspector

ℹ️

console is supported. Other APIs are stubs and will throw an error. Due to security implications the Deno team does not plan to polyfill these APIs.

Node.js docs

node:net

ℹ️

Missing net.Socket.prototype.constructor with fd option.

Node.js docs

node:perf_hooks

ℹ️

Missing perf_hooks.eventLoopUtilization, perf_hooks.timerify, perf_hooks.monitorEventLoopDelay.

Node.js docs

node:process

ℹ️

Missing disconnect, message, multipleResolves, rejectionHandled and worker events.

Node.js docs

node:repl

ℹ️

builtinModules and _builtinLibs are supported. Missing REPLServer.prototype.constructor and start().

Node.js docs

node:string_decoder

ℹ️

Missing decoding of ascii, latin1 and utf16le decoding options.

Node.js docs

node:test

ℹ️

Currently only test API is supported.

Node.js docs

node:tls

ℹ️

Missing createSecurePair.

Node.js docs

node:trace_events

❌

All exports are non-functional stubs.

Node.js docs

node:tty

ℹ️

Missing ReadStream and WriteStream implementation.

Node.js docs

node:v8

ℹ️

cachedDataVersionTag and getHeapStatistics are supported. setFlagsFromStrings is a noop. Other APIs are not supported and will throw and error. The other APIs could be polyfilled, but due inherent lack of format stability between the V8 versions, the Deno team is considering requiring a special flag to use them.

Node.js docs

node:vm

ℹ️

runInThisContext is supported. Other APIs are not polyfilled and will throw and error.

Node.js docs

node:wasi

❌

All exports are non-functional stubs.

Node.js docs

node:worker_threads

ℹ️

Missing parentPort.emit, parentPort.removeAllListeners, markAsUntransferable, moveMessagePortToContext, receiveMessageOnPort, Worker.prototype.getHeapSnapshot.

Node.js docs

node:zlib

ℹ️

Missing Options.prototype.constructor, BrotliOptions.prototype.constructor, BrotliDecompress.prototype.constructor, ZlibBase.prototype.constructor.

Node.js docs

Globals

These global objects are fully supported in Deno:

This is the list of Node globals that Deno supports. These globals are only available in the npm package scope. In your own code you can use them by importing them from the relevant node: module.

Global name	Status
AbortController	✅
AbortSignal	✅
Blob	✅
Buffer	✅
ByteLengthQueuingStrategy	✅
__dirname	✅
__filename	✅
atob	✅
BroadcastChannel	✅
btoa	✅
clearImmediate	✅
clearInterval	✅
clearTimeout	✅
CompressionStream	✅
console	✅
CountQueuingStrategy	✅
Crypto	✅
CryptoKey	✅
CustomEvent	✅
CustomEvent	✅
DecompressionStream	✅
Event	✅
EventTarget	✅
exports	✅
fetch	✅
fetch	✅
File	✅
File	✅
FormData	✅
global	✅
Headers	✅
MessageChannel	✅
MessageEvent	✅
MessagePort	✅
module	✅
PerformanceEntry	✅
PerformanceMark	✅
PerformanceMeasure	✅
PerformanceObserver	✅
PerformanceObserverEntryList	❌
PerformanceResourceTiming	❌
performance	✅
process	✅
queueMicrotask	✅
ReadableByteStreamController	✅
ReadableStream	✅
ReadableStreamBYOBReader	✅
ReadableStreamBYOBRequest	✅
ReadableStreamDefaultController	✅
ReadableStreamDefaultReader	✅
require	✅
Response	✅
Request	✅
setImmediate	✅
setInterval	✅
setTimeout	✅
structuredClone	✅
structuredClone	✅
SubtleCrypto	✅
DOMException	✅
TextDecoder	✅
TextDecoderStream	✅
TextEncoder	✅
TextEncoderStream	✅
TransformStream	✅
TransformStreamDefaultController	✅
URL	✅
URLSearchParams	✅
URLSearchParams	✅
WebAssembly	✅
WritableStream	✅
WritableStreamDefaultController	✅
WritableStreamDefaultWriter	✅