# mikro > Mikro.js: TypeScript for microcontrollers Latest version **0.22.0** (published 2026-09-30) · MIT license · 0 weekly downloads ## Install ```sh npm install mikro pnpm add mikro yarn add mikro bun add mikro ``` Provides the command `mikro`. ## Health **Score 65/100 (B)** — status: active. Positive: esm support; no vulnerabilities; has provenance; recently updated; high maintenance score. Warnings: low downloads; no types; large bundle; pre 1.0. ## Facts | | | |---|---| | Version | 0.22.0 | | Published | 2026-09-30 | | First published | 2015-02-09 | | Weekly downloads | 0 | | License | MIT | | TypeScript types | none | | Module format | ESM | | Node | >=24.0.0 | | Dependencies | 25 | | Unpacked size | 27.5 MB | | Known vulnerabilities | 0 | | Install scripts | no | | Provenance | attested (GitHub Actions) | | GitHub stars | 16 | | Author | Bjørge Næss | | Maintainers | bjoerge | | Keywords | embedded, esp32, iot, javascript, microcontroller, mikrojs, quickjs, typescript | ## Links - npm: https://www.npmjs.com/package/mikro - Repository: https://github.com/mikrojs/mikro - Homepage: https://github.com/mikrojs/mikro#readme - Issues: https://github.com/mikrojs/mikro/issues - npm.io page: https://npm.io/package/mikro ## Dependencies (25) - [ink](https://npm.io/package/ink.md) ^7.1.1 - [tar](https://npm.io/package/tar.md) ^7.5.22 - [open](https://npm.io/package/open.md) ^11.0.2 - [rxjs](https://npm.io/package/rxjs.md) ^7.8.2 - [cbor2](https://npm.io/package/cbor2.md) ^2.3.0 - [react](https://npm.io/package/react.md) ^19.2.8 - [semver](https://npm.io/package/semver.md) ^7.8.5 - [figures](https://npm.io/package/figures.md) ^6.1.0 - [std-env](https://npm.io/package/std-env.md) ^4.2.0 - [env-paths](https://npm.io/package/env-paths.md) ^4.0.0 - [serialport](https://npm.io/package/serialport.md) ^13.0.0 - [@optique/run](https://npm.io/package/@optique/run.md) ^1.2.5 - [cli-spinners](https://npm.io/package/cli-spinners.md) ^3.4.0 - [preferred-pm](https://npm.io/package/preferred-pm.md) ^5.0.0 - [@optique/core](https://npm.io/package/@optique/core.md) ^1.2.5 - [@mikrojs/native](https://npm.io/package/@mikrojs/native.md) 0.22.0 - [@mikrojs/schema](https://npm.io/package/@mikrojs/schema.md) 0.22.0 - [update-notifier](https://npm.io/package/update-notifier.md) ^7.3.1 - [@mikrojs/esptool](https://npm.io/package/@mikrojs/esptool.md) 0.22.0 - [@mikrojs/quickjs](https://npm.io/package/@mikrojs/quickjs.md) 0.22.0 - [ink-select-input](https://npm.io/package/ink-select-input.md) ^6.2.0 - [@mikrojs/firmware](https://npm.io/package/@mikrojs/firmware.md) 0.22.0 - [uint8array-extras](https://npm.io/package/uint8array-extras.md) ^1.5.0 - [@mikrojs/analyze-imports](https://npm.io/package/@mikrojs/analyze-imports.md) 0.22.0 - [rxjs-exhaustmap-with-trailing](https://npm.io/package/rxjs-exhaustmap-with-trailing.md) ^2.1.1 ## Alternatives - [@openai/codex-sdk](https://npm.io/package/@openai/codex-sdk.md) — 731.4K weekly downloads - [babel-plugin-transform-react-jsx](https://npm.io/package/babel-plugin-transform-react-jsx.md) — 565.0K weekly downloads - [babel-helper-remove-or-void](https://npm.io/package/babel-helper-remove-or-void.md) — 508.5K weekly downloads - [@pnpm/store-controller-types](https://npm.io/package/@pnpm/store-controller-types.md) — 186.9K weekly downloads - [react-native-signature-canvas](https://npm.io/package/react-native-signature-canvas.md) — 155.6K weekly downloads ## Recent versions - 0.22.0 (latest) — 2026-09-30 - 0.21.1-next.20260928214050 (next) — 2026-09-28 - 0.21.0-pr-431.20260921210123 (pr-431) — 2026-09-21 - 0.19.0-pr-352.20260829215534 (pr-352) — 2026-08-29 - 0.18.0-pr-306.20260731215718 (pr-306) — 2026-07-31 - 0.17.1-pr-300.20260731010039 (pr-300) — 2026-07-31 - 0.17.0-pr-276.20260721233726 (pr-276) — 2026-07-22 - 0.16.1-pr-265.20260718161156 (pr-265) — 2026-07-18 - 0.15.0-pr-243.20260613121220 (pr-243) — 2026-06-13 - 0.14.0-pr-229.20260613004639 (pr-229) — 2026-06-13 - 0.11.0-pr-172.g462f877 (pr-172) — 2026-05-30 - 0.10.0-pr-171.g56c9fcc (pr-171) — 2026-05-30 - 0.21.1-next.20260927212749 — 2026-09-27 - 0.21.1-next.20260926222438 — 2026-09-26 - 0.21.0 — 2026-09-21 - … 46 more at https://npm.io/package/mikro/versions ## README

Mikro.js logo

Mikro.js

TypeScript-first runtime for microcontrollers with a focus on developer experience and iteration speed.

Documentation · Getting Started · API Reference · Examples

[![Open on npmx.dev](https://npmx.dev/api/registry/badge/name/mikro)](https://npmx.dev/package/mikro) [![Open on npmx.dev](https://npmx.dev/api/registry/badge/version/mikro)](https://npmx.dev/package/mikro) [![Open on npmx.dev](https://npmx.dev/api/registry/badge/updated/mikro)](https://npmx.dev/package/mikro)
> [!NOTE] > Mikro.js is in early development. Expect APIs to change. ## Features - **Fast feedback loop**: save a file and the device runs the new code seconds later - **Full TypeScript**: near-complete ES2024, type-checked hardware APIs, editor autocomplete - **Batteries included**: GPIO, PWM, I2C, SPI, UART, WiFi, HTTP, UDP, NeoPixel, deep sleep, SNTP, CBOR, schema validation, key-value storage - **Host simulator**: run your code on your computer with `mikro sim dev`, no microcontroller attached - **No exceptions**: typed `Result` errors instead of try/catch, so every expected failure is visible in the signature - **Built-in testing**: test suites with resource leak detection, in the simulator or on real hardware ## Quickstart ```sh npm create mikro ``` ## Example ```ts import {DigitalOut} from 'mikro/gpio' import {sleep} from 'mikro/sleep' const led = DigitalOut(20).orPanic('Failed to configure LED pin') while (true) { led.write(1) await sleep(500) led.write(0) await sleep(500) } ``` ## Overview The core runtime is a standalone C++ library with no ESP-IDF dependencies. This makes it portable across platforms. - **Engine**: [QuickJS-NG](https://github.com/quickjs-ng/quickjs) ([near-complete ES2024 coverage](https://test262.fyi/#|qjs_ng)) - **Runtime**: Standalone C++ library with cooperative, single-threaded event loop - **Platform**: ESP-IDF >= 6.1 (ESP32, ESP32-C3, ESP32-S3, ESP32-C5, ESP32-C6), desktop (macOS, Linux) - **Modules**: Four-source resolution: virtual modules, native C modules, bytecode builtins, filesystem (LittleFS) - **Bytecode**: TypeScript bundled with esbuild, compiled to QuickJS bytecode at build time - **Tooling**: Node.js CLI (Ink/React), Node-API addon for host-side development and simulation ## Acknowledgements Mikro.js has drawn heavy inspiration from [txiki.js](https://github.com/saghul/txiki.js), a small JavaScript runtime built on QuickJS. Thanks to Felix Wieland ([@flexwie](https://github.com/flexwie)) for generously donating the `mikro` package name on npm. ## License MIT --- _Source: https://npm.io/package/mikro · Machine-readable twin of the npm.io package page. Health data is recomputed on every publish._