Mikro.jsTypeScript for microcontrollers

Write TypeScript, save, see it running on your ESP32 in seconds.

Get Started

View on GitHub

Instant feedback

Save a file, see it running on your device in seconds. Live reload over serial.

Full TypeScript

Type-checked hardware APIs with ES2024 support. Errors are in the type signature, not hidden behind try/catch.

ES modules

Standard import/export syntax. JSON imports. No bundler configuration needed.

WiFi + fetch

Connect to networks and make HTTP requests with the familiar fetch API.

Host simulator

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

No exceptions

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

Your first program

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

const LED = 20

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

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

Get it running:

npm create mikrojs -- my-blinky

cd my-blinky

npx mikro dev