ReadableStreamDefaultReader: closed property

Note: This feature is available in Web Workers.

The closed read-only property of the ReadableStreamDefaultReader interface returns a Promise that fulfills when the stream closes, or rejects if the stream throws an error or the reader's lock is released. This property enables you to write code that responds to an end to the streaming process.

Value

Examples

In this snippet, a previously-created reader is queried to see if the stream has been closed. When it is closed, the promise fulfills and the message is logged to the console.

js
reader.closed.then(() => {
  console.log("reader closed");
});

Specifications

Specification
Streams Standard
# ref-for-generic-reader-closed②

Browser compatibility

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desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
Node.js
closed

Legend

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Full support
Full support

See also