Deno cheat sheet v1.28

File System

• Deno.chmod() / sync

• Deno.chown() / sync

• Deno.copyFile() / sync

• Deno.create() / sync

• Deno.FsFile

• Deno.isatty()

• Deno.link() / sync

• Deno.lstat() deploy / sync

• Deno.makeTempDir() / sync

• Deno.makeTempFile() / sync

• Deno.mkdir() / sync

• Deno.readDir() deploy / sync

• Deno.readFile / sync

• Deno.readLink() / sync

• Deno.readTextFile() deploy / sync

• Deno.realPath() deploy / sync

• Deno.remove() / sync

• Deno.rename() / sync

• Deno.stat() deploy / sync

• Deno.symlink() / sync

• Deno.truncate() / sync

• Deno.utime() / sync

• Deno.watchFs()

• Deno.writeFile() / sync

• Deno.writeTextFile() / sync

Tools

• Deno.bench()

• Deno.test()

Resources

• Deno.close()

• Deno.fdatasync() / sync

• Deno.flock() unstable / sync

• Deno.fstat() / sync

• Deno.fsync() / sync

• Deno.ftruncate() / sync

• Deno.funlock() unstable / sync

• Deno.futime() / sync

• Deno.open() deploy / sync

• Deno.read() / sync

• Deno.resources()

• Deno.seek() / sync

• Deno.write() / sync

FFI (Foreign Function Interface)

• Deno.dlopen() unstable

• Deno.UnsafeFnPointer unstable

• Deno.UnsafePointerView unstable

Errors

• Deno.errors.AddrInUse

• Deno.errors.AddrNotAvailable

• Deno.errors.AlreadyExists

• Deno.errors.BadResource

• Deno.errors.BrokenPipe

• Deno.errors.Busy

• Deno.errors.ConnectionAborted

• Deno.errors.ConnectionRefused

• Deno.errors.ConnectionReset

• Deno.errors.Http

• Deno.errors.Interrupted

• Deno.errors.InvalidData

• Deno.errors.NotConnected

• Deno.errors.NotFound

• Deno.errors.NotSupported

• Deno.errors.PermissionDenied

• Deno.errors.TimedOut

• Deno.errors.UnexpectedEof

• Deno.errors.WriteZero

Subprocesses

• Deno.Command unstable

• Deno.kill()

• Deno.Process

• Deno.run()

• Deno.spawn() unstable / sync

• Deno.spawnChild() unstable

Runtime utils

• Deno.addSignalListener()

• Deno.args

• Deno.build

• Deno.chdir()

• Deno.consoleSize()

• Deno.cwd() deploy

• Deno.DiagnosticCategory unstable

• Deno.env deploy

• Deno.execPath()

• Deno.exit()

• Deno.gid()

• Deno.hostname()

• Deno.inspect()

• Deno.loadavg()

• Deno.mainModule

• Deno.memoryUsage()

• Deno.metrics()

• Deno.noColor

• Deno.osRelease()

• Deno.permissions

• Deno.PermissionStatus

• Deno.pid

• Deno.ppid

• Deno.refTimer()

• Deno.removeSignalListener()

• Deno.stderr

• Deno.stdin

• Deno.stdout

• Deno.systemMemoryInfo()

• Deno.uid()

• Deno.umask() unstable

• Deno.unrefTimer()

• Deno.version

Network

• Deno.connect() deploy

• Deno.connect() unstable

• Deno.connectTls() deploy

• Deno.connectTls() unstable

• Deno.createHttpClient() unstable

• Deno.HttpClient unstable

• Deno.listen()

• Deno.listen() unstable

• Deno.listenDatagram() unstable

• Deno.listenTls()

• Deno.networkInterfaces()

• Deno.resolveDns() deploy

• Deno.serve() unstable

• Deno.serveHttp()

• Deno.shutdown()

• Deno.startTls() deploy

• Deno.upgradeHttp() unstable

• Deno.upgradeWebSocket()

Window

• alert()

• confirm()

• console deploy

• location

• navigator

• prompt()

• self

• window

Async

• clearInterval() deploy

• clearTimeout() deploy

• queueMicrotask() deploy

• setInterval() deploy

• setTimeout() deploy

Fetch & URLs

• fetch() deploy

• FormData

• Headers deploy

• Request deploy

• Response deploy

• URL deploy

• URLPattern deploy

• URLSearchParams

Websocket

• WebSocket deploy

• WebSocketStream unstable

Web Workers

• Worker

Message

• MessageChannel

• MessagePort

Performance

• performance deploy

• PerformanceEntry deploy

• PerformanceMark deploy

• PerformanceMeasure deploy

Storage

• localStorage

• sessionStorage

File

• Blob deploy

• File deploy

• FileReader

TextEncoder

• TextDecoder deploy

• TextDecoderStream deploy

• TextEncoder deploy

• TextEncoderStream deploy

Streams

• ByteLengthQueuingStrategy

• CountQueuingStrategy

• ReadableByteStreamController

• ReadableStream deploy

• ReadableStreamDefaultController

• ReadableStreamDefaultReader

• ReadableStreamReader

• TransformStream deploy

• TransformStreamDefaultController

• WritableStream

• WritableStreamDefaultController deploy

• WritableStreamDefaultWriter

Compression Streams

• CompressionStream

• DecompressionStream

Cache

• Cache

• CacheStorage

Events

• addEventListener()

• CloseEvent

• CustomEvent

• dispatchEvent()

• Event

• EventTarget

• MessageEvent

• onload

• onunload

• ProgressEvent

• removeEventListener()

Errors

• DOMException

• ErrorEvent

• onerror

• reportError()

AbortController

• AbortController

• AbortSignal

CryptoKey

• crypto deploy

• CryptoKey

• CryptoKeyPair

• SubtleCrypto deploy

Binary to ASCII

• atob() deploy

• btoa() deploy

BroadcastChannel

• BroadcastChannel deploy

structuredClone

• structuredClone()

WebAssembly

• WebAssembly.compile()

• WebAssembly.CompileError

• WebAssembly.compileStreaming()

• WebAssembly.Global

• WebAssembly.Instance

• WebAssembly.instantiate()

• WebAssembly.instantiateStreaming()

• WebAssembly.LinkError

• WebAssembly.Memory

• WebAssembly.Module

• WebAssembly.RuntimeError

• WebAssembly.Table

• WebAssembly.validate()

WebGPU

• GPU unstable

• GPUAdapter unstable

• GPUBindGroup unstable

• GPUBindGroupLayout unstable

• GPUBuffer unstable

• GPUBufferUsage unstable

• GPUColorWrite unstable

• GPUCommandBuffer unstable

• GPUCommandEncoder unstable

• GPUComputePassEncoder unstable

• GPUComputePipeline unstable

• GPUDevice unstable

• GPUMapMode unstable

• GPUOutOfMemoryError unstable

• GPUPipelineLayout unstable

• GPUQuerySet unstable

• GPUQueue unstable

• GPURenderBundle unstable

• GPURenderBundleEncoder unstable

• GPURenderPassEncoder unstable

• GPURenderPipeline unstable

• GPUSampler unstable

• GPUShaderModule unstable

• GPUShaderStage unstable

• GPUSupportedFeatures unstable

• GPUSupportedLimits unstable

• GPUTexture unstable

• GPUTextureUsage unstable

• GPUTextureView unstable

• GPUUncapturedErrorEvent unstable

• GPUValidationError unstable

Archive/Tar

Provides a Tar and Untar classes for compressing and decompressing arbitrary data.

Async

Provide help with asynchronous tasks like delays, debouncing, deferring, or pooling.

Bytes

Provides helper functions to manipulate Uint8Array byte slices that are not included on the Uint8Array prototype.

Collections

Functions for specific common tasks around collection types like Array and Record.

Crypto

Extensions to the Web Crypto supporting additional encryption APIs.

Datetime   Browser

Utilities for dealing with Date objects.

Dotenv

Load environment variables from .env files.

Encoding/ascii85   Browser

Encode and decode for Ascii85/base85 encoding.

Encoding/base32   Browser

Encode and decode for base32 encoding.

Encoding/base64   Browser

Encode and decode for base64 encoding.

Encoding/base64 (URL safe)   Browser

Encode and decode for base64 URL safe encoding.

Encoding/binary

Functions for encoding binary data in array buffers.

Encoding/csv

Port of the Go encoding/csv library.

Encoding/front matter

Extract and test functions to handle many forms of front matter.

Encoding/hex   Browser

Port of the Go encoding/hex library.

Encoding/jsonc   Browser

Parse function for parsing JSONC strings.

Encoding/toml   Browser

Parse and stringify for handling TOML encoded data.

Encoding/varint

Functions for encoding typed integers in array buffers.

Encoding/yaml   Browser

Parse and stringify for handling YAML encoded data.

Flags   Browser

Command line arguments parser based on minimist.

Fmt/bytes   Browser

Pretty print bytes.

Fmt/colors   Browser

String formatters and utilities for dealing with ANSI color codes.

Fmt/printf

Sprintf and printf} for printing formatted strings to stdout.

FS

Helpers for working with the filesystem.

HTTP

Provides user-friendly serve on top of Deno's native HTTP server and other utilities for creating HTTP servers and clients.

IO

Utilities for working with Deno's readers, writers, and web streams.

Log

Logging library with the support for terminal and file outputs. Also provides interfaces for building custom loggers.

Media types

Utility functions for media types (MIME types).

Node

Compatibility layer for the Node.js standard library.

Path   Browser

Utilities for working with OS-specific file paths.

Permissions

Helpers for interacting with Deno's permissions system.

Semver   Browser

The semantic version parser. Adapted directly from semver.

Signal

Higher level API for dealing with OS signals.

Streams

Utilities for working with the Streams API. Includes buffering and conversion.

Testing/asserts   Browser

A library of assertion functions.

Testing/bdd

A BDD interface to Deno.test() API.

Testing/mock   Browser

A mocking and spying library.

Testing/snapshot

A snapshotting library.

Testing/time   Browser

Utilities for mocking time while testing.

UUID   Browser

Generators and validators for UUIDs for versions v1, v4 and v5.