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Node APIs

Deno provides polyfills for a number of built-in Node.js modules and globals.

Explore built-in Node APIs

Node compatibility is an ongoing project - help us identify gaps and let us know which modules you need by opening an issue on GitHub.

Compatibility status Jump to heading

= Full support
= Partial support
= Stubs only or unsupported
node:assert
node:async_hooks

AsyncResource: The AsyncResource implementation is a non-functional stub.
executionAsyncId: The executionAsyncId implementation is a non-functional stub.
createHook: The createHook implementation is a non-functional stub.

node:buffer
node:child_process
node:cluster

All exports are non-functional stubs.

All symbols: This symbol is a non-functional stub.

node:console
node:crypto

Certificate: The methods are non-functional stubs.
generateKeyPair: The x448 option is not supported.
generatePrime: The safe, add and rem option is not supported.
KeyObject: The methods are non-functional stubs.
publicDecrypt: This symbol is a non-functional stub.
secureHeapUsed: This symbol is a non-functional stub.
setEngine: This symbol is a non-functional stub.
ECDH: The convertKey method is a non-functional sub.
Sign: The sign and verify methods are not supported with non BinaryLike input.

node:dgram

Socket: The following methods are non-functional stubs:

  • addMembership
  • addSourceSpecificMembership
  • dropMembership
  • dropSourceSpecificMembership
  • setBroadcast
  • setMulticastInterface
  • setMulticastLoopback
  • setMulticastTtl
  • setTtl
node:diagnostics_channel
node:dns

resolve: The ttl option is not supported.
resolve4: The ttl option is not supported.
resolve6: The ttl option is not supported.
resolveCname: The ttl option is not supported.
resolveCaa: The ttl option is not supported.
resolveMx: The ttl option is not supported.
resolveNaptr: The ttl option is not supported.
resolveNs: The ttl option is not supported.
resolvePtr: The ttl option is not supported.
resolveSoa: The ttl option is not supported.
resolveSrv: The ttl option is not supported.
resolveTxt: The ttl option is not supported.
resolveAny: The ttl option is not supported.

node:domain

All exports are non-functional stubs. This is a deprecated Node module.

All symbols: This symbol is a non-functional stub.

node:events
node:fs

writeFile: Missing utf16le, latin1 and ucs2 encoding.
writeFileSync: Missing utf16le, latin1 and ucs2 encoding.

node:fs--promises

lchmod: The lchmod implementation is a non-functional stub.

node:http

RequestOptions: Option createConnection is not supported.
ClientRequestArgs: Option createConnection is not supported.
ClientRequest: Constructor option createConnection is not supported.
request: Constructor option createConnection is not supported.
get: Constructor option createConnection is not supported.

node:http2

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

node:https

Server: The cert and key options do not support an array input.

node:inspector

console is supported. Other APIs are non-functional stubs and will throw an error.

node:module

Module: The register method is not supported.

node:net

Socket: The fd option is not supported.

node:os
node:path
node:perf_hooks

performance: The eventLoopUtilization method is a non-functional stub. The timerify method is not implemented.
monitorEventLoopDelay: This symbol is not implemented.

node:process

The multipleResolves and worker events are not supported.

node:punycode
node:querystring
node:readilne
node:repl

REPLServer: This symbol is not supported.
start: This symbol is not supported.

node:sea
node:sqlite

This module is not implemented.

All symbols: This module is not implemented.

node:stream
node:string_decoder
node:test

Currently only test API is supported.

node:timers
node:tls

createSecurePair: This symbol is currently not supported.

node:trace_events

All exports are non-functional stubs.

All symbols: This symbol is a non-functional stub.

node:tty
node:url
node:util

transferableAbortSignal: This symbol is currently not supported.
transferableAbortController: This symbol is currently not supported.
MIMEParams: This symbol is currently not supported.
MIMEType: This symbol is currently not supported.
getSystemErrorMap: This symbol is currently not supported.

node:v8

cachedDataVersionTag and getHeapStatistics are supported. setFlagsFromStrings is a noop. Other APIs are not supported and will throw and error.

setFlagsFromStrings: This function is a noop.

node:vm

This module is supported only partially.

node:wasi

All exports are non-functional stubs.

All symbols: This symbol is a non-functional stub.

node:worker_threads

parentPort: The emit method is not supported. The removeAllListeners method is not supported.
markAsUntransferable: This symbol is not supported.
moveMessagePortToContext: This symbol is not supported.
receiveMessageOnPort: This symbol is not supported.
Worker: The getHeapSnapshot method is not supported.

node:zlib

Globals Jump to heading

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 ⚠️ Info
__filename ⚠️ Info
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 ✅