Run Debug Stop Clear │ Load │ Verbose │ Strict │ Settings │ Hello World Variables & Types Async / Top-Level Await node:buffer — binary data toolkit node:path — path manipulation node:events — EventEmitter node:events — async helpers (once, on, abort) node:crypto — hash, HMAC, random node:util — format & inspect node:url — URL & search params node:os — host & platform info node:async_hooks — AsyncLocalStorage node:stream — Readable push + data events node:fs — write & read (promises) node:zlib — gzip round-trip node:perf_hooks — high-resolution timing node:stream/web — WHATWG ReadableStream / WritableStream / TransformStream node:process — runtime info node:tty — detect a terminal node:net — TCP echo client/server node:dgram — UDP datagram round-trip node:dns — promises lookup & resolve node:http — loopback request/response node:readline — line interface over stdin node:child_process — spawn & capture output node:child_process — fork() + IPC channel node:worker_threads — Worker + parentPort + MessageChannel node:cluster — primary forks workers + IPC coordination node:tls — ciphers & secure client API node:https — secure GET request API node:http2 — server & client session node:vm — run code in a separate context ws — WebSocket echo client/server mqtt — broker client publish/subscribe node:constants — flattened OS/fs/crypto constants node:test — built-in test runner + reporters + mock node:assert — assertions node:diagnostics_channel — named pub/sub + tracing node:fs/promises — promise-first filesystem node:module — builtins, require & source maps node:punycode — IDN encode/decode node:querystring — legacy query codec node:repl — programmatic REPL server node:sea — single-executable app assets node:stream/promises — pipeline & finished node:string_decoder — split multi-byte decode node:timers — module timers incl. promises node:trace_events — tracing categories node:v8 — heap statistics & serialization node:wasi — WASI shim surface uuid — correlation IDs (RFC 9562) json5 — full JSON5 config tour cbor — RFC 8949 binary encode/decode semver — gate a firmware OTA update semver — dependency range resolver crc — checksum every width csv — full CSV data-feed tour jsonStream — streaming / SAX JSON jsonPatch — RFC 6902 + RFC 7386 jsonPath — RFC 9535 queries jmesPath — JMESPath queries decimal — exact money math template — Mustache templates qs — nested querystring codec diff — review a config change as a patch toml — full TOML manifest tour ini — full INI config tour ansiColor — terminal styling msgpack — MessagePack binary encode/decode yaml — full YAML config tour baseEncoding — base16/32/45/58/62/85 codecs totp — RFC 6238 codes cron — parse & schedule glob — pattern matching jwt — sign & verify lz4 — block & frame compression mime — MIME type resolver protobuf — Protocol Buffers schema encode/decode validate — Zod schema validation tar — build, extract, entry types & PAX tar — streaming write & read security — device security status toon — Token-Oriented Object Notation encode & decode docstore — put & query time — delay & timestamps image — resize & encode mdns — browse services timers — monotonic sleep snmp — poll an agent + listen for traps bacnet — read/write a controller + discover devices locale — i18n & formatting storage — write & read file router — define HTTP routes xml — parse, build & validate network — http app xpath — XPath 1.0 query thread — 802.15.4 mesh networking xslt — XSLT 1.0 transform mcpClient — connect & list tools schematron — ISO Schematron validation mcpServer — register a tool xsd — W3C XML Schema (XSD 1.0) validation pty — spawn a pseudo-terminal relaxng — RELAX NG (XML syntax) validation saxXml — streaming SAX + pull XML wifi — connect & scan wifiRaw — promiscuous packet capture ethernet — RMII PHY link zip — in-memory archive ota — firmware update knx — tunnel to a KNX gateway + watch the bus dnp3 — poll + control a DNP3 outstation mbus — read a meter over an M-Bus gateway opcua — read + subscribe to an OPC UA server CoAP — constrained-device REST client AI — on-device model inference surface capabilities — ask the runtime what it can do Report templates — validation and EREL expressions erd:lora — LoRa radio Adc — continuous DMA sampling Ble — advertise a peripheral BleRaw — low-level HCI driver Bme280 — environmental sensor Board — power & wake control Camera — capture a JPEG frame CanBus — send a CAN frame Dac — generate a sine waveform DhtSensor — temperature & humidity Gpio — blink an LED Display — draw on an OLED DisplayP4 — RGB framebuffer display Encoder — quadrature rotary encoder HallSensor — built-in magnetic sensor Hx711 — load cell weight sensor I2cBus — read a device register I2S — stream audio samples IrReceiver — receive & transmit IR codes Lcd — HD44780 character display LedStrip — addressable RGB strip LedMatrix — MAX7219 8x8 matrix Ledc — PWM dimming with fade MCPWM — H-bridge motor drive with dead-time Modbus — energy-meter poller + pump-station server CANopen — node session + SDO + PDO codec Mosfet — PWM heater stage + pump relay DALI — IEC 62386 lighting bus + DT8 colour codec Nvs — persisted device settings Potentiometer — volume knob + joystick axis Rf433 — remote sockets + code learning Rfid — access-control door reader Servo — calibrated sorting gate + sweep SingleLed — RGB control RS485 — half-duplex Modbus RTU bus master RTC — real-time clock & alarm SdCard — file storage SDIO — raw sector access SPI — NOR flash + thermocouple transactions Stepper — homed camera slider + positioned moves TempSensor — enclosure thermostat TftDisplay — SPI graphics Timer — periodic hardware timer TMP102 — I2C ambient monitor Touch — capacitive pads & gestures UART — framed sensor protocol with parser Ultrasonic — distance sensor (HC-SR04) USB — CDC device mode Zigbee — coordinator network