TextDecoderStream: writable property

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since ⁨September 2022⁩.

Note: This feature is available in Web Workers.

The writable read-only property of the TextDecoderStream interface returns a WritableStream that accepts binary data, in the form of ArrayBuffer, TypedArray, or DataView chunks (SharedArrayBuffer and its views are also allowed), to be decoded into strings.

Value

A WritableStream.

Examples

This example creates a TextDecoderStream that decodes UTF-8 encoded binary data. It writes some encoded binary data to the writable stream, then reads the decoded text from the readable stream.

const stream = new TextDecoderStream();

// Write data to be decoded
const data = Uint8Array.fromBase64("5L2g5aW95LiW55WM");
const writer = stream.writable.getWriter();
writer.write(data);
writer.close();

// Read decoded data
const reader = stream.readable.getReader();
let done = false;
let output = "";
while (!done) {
  const result = await reader.read();
  if (result.value) {
    output += result.value;
  }
  done = result.done;
}
console.log(output);