/Web APIs

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.

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"));


Browser compatibility

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
writable 89 89 No No 75 No No No No No No No

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