files/en-us/web/api/textencoderstream/writable/index.md
{{APIRef("Encoding API")}}{{AvailableInWorkers}}
The writable read-only property of the {{domxref("TextEncoderStream")}} interface returns a {{domxref("WritableStream")}} that accepts strings to be encoded into binary data.
A {{domxref("WritableStream")}}.
This example creates a TextEncoderStream that encodes strings as UTF-8. It writes some strings to the writable stream, then reads the encoded binary data from the readable stream.
const stream = new TextEncoderStream();
// Write data to be encoded
const data = "你好世界";
const writer = stream.writable.getWriter();
writer.write(data);
writer.close();
// Read compressed data
const reader = stream.readable.getReader();
let done = false;
let output = [];
while (!done) {
const result = await reader.read();
if (result.value) {
output.push(...result.value);
}
done = result.done;
}
console.log(new Uint8Array(output).toBase64()); // 5L2g5aW95LiW55WM
{{Specifications}}
{{Compat}}