SerialPort: writable property

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

Note: This feature is available in Dedicated Web Workers.

The writable read-only property of the SerialPort interface returns a WritableStream for sending data to the device connected to the port. Chunks written to this stream must be instances of ArrayBuffer, TypedArray, or DataView. This property is non-null as long as the port is open and has not encountered a fatal error.



The following example shows how to write a string to a port. A TextEncoder converts the string to a Uint8Array before transmission.

const encoder = new TextEncoder();
const writer = port.writable.getWriter();
await writer.write(encoder.encode("PING"));


Web Serial API
# dom-serialport-writable

Browser compatibility

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