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WritableStreamDefaultController: error() method

The error() method of the WritableStreamDefaultController interface causes any future interactions with the associated stream to error.

This method is rarely used, since usually it suffices to return a rejected promise from one of the underlying sink's methods. However, it can be useful for suddenly shutting down a stream in response to an event outside the normal lifecycle of interactions with the underlying sink.

Syntax

js

error(message)

Parameters

message

A string representing the error you want future interactions to fail with.

Return value

None (undefined).

Exceptions

TypeError

The stream you are trying to error is not a WritableStream.

Examples

js

const writableStream = new WritableStream({
  start(controller) {
    // do stuff with controller

    // error stream if necessary
    controller.error("My error is broken");
  },
  write(chunk, controller) {
    // ...
  },
  close(controller) {
    // ...
  },
  abort(err) {
    // ...
  },
});

Specifications

Specification
Streams Standard
# ref-for-ws-default-controller-error①

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
error 59 16 100 No 46 14.1 59 59 100 43 14.5 7.0

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https://developer.mozilla.org/en-US/docs/Web/API/WritableStreamDefaultController/error