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

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

The writable read-only property of the WebTransportDatagramDuplexStream interface returns a WritableStream instance that can be used to unreliably write outgoing datagrams to the stream.

"Unreliably" means that transmission of data is not guaranteed, nor is arrival in a specific order. This is fine in some situations and provides very fast delivery. For example, you might want to transmit regular game state updates where each message supersedes the last one that arrives, and order is not important.

Note: This feature is available in Web Workers



See the main WebTransportDatagramDuplexStream interface page.


# dom-webtransportdatagramduplexstream-writable

Browser compatibility

BCD tables only load in the browser

See also