Mikro.jsexperimental

TypeScript for microcontrollers

Modern JavaScript, type safety and instant refresh on real hardware.

Get Started

View on GitHub

Fast feedback loop

Interactive dev console with watch mode and incremental builds that deploy to your device in a few seconds.

Full TypeScript

Type-checked hardware APIs with modern JavaScript support. Errors are in the type signature, not hidden behind try/catch.

Batteries included*

GPIO, PWM, I2C, SPI, UART, WiFi, HTTP, UDP, NeoPixel, deep sleep, SNTP, CBOR, schema validation, key-value storage, and more.

Host simulator

Run and test your code on your computer with mikro sim dev. No microcontroller needed.

No exceptions

Typed Result errors instead of try/catch. Every failure is visible in the type signature.

Built-in testing

Write tests with familiar describe/it syntax. Run on-device, in the simulator, or against stubbed hardware modules.

Your first program

Blinky: the "Hello, World!" of tiny devices.

import {digitalWrite
, pinMode
} from 'mikrojs/pin'
import {sleep
} from 'mikrojs/sleep'

// Replace with your board's LED pin if different
const LED_PIN
 = 15

pinMode
(LED_PIN
, 'OUTPUT').orPanic
('Failed to set pin mode')

while (true) {
  digitalWrite
(LED_PIN
, 1)
  await sleep
(500)
  digitalWrite
(LED_PIN
, 0)
  await sleep
(500)
}

Get it running:

npmpnpmyarnbun

npm create mikrojs -- my-blinky --template blinky
cd my-blinky
npm install
npx mikro dev

pnpm create mikrojs my-blinky --template blinky
cd my-blinky
pnpm install
pnpm mikro dev

yarn create mikrojs my-blinky --template blinky
cd my-blinky
yarn install
yarn mikro dev

bun create mikrojs my-blinky --template blinky
cd my-blinky
bun install
bunx mikro dev

Learn more

Getting Started: set up your first project step by step
Error Handling: learn how Mikro.js uses typed Results instead of exceptions
API Reference: explore GPIO, WiFi, I2C, SPI, and more
Examples: blinky, PWM, WiFi, NeoPixel, UART, and more