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Showing content from http://developer.mozilla.org/en-US/docs/Web/API/TextEncoder below:

TextEncoder - Web APIs | MDN

Baseline Widely available

Note: This feature is available in Web Workers.

The TextEncoder interface enables you to encode a JavaScript string using UTF-8.

TextEncoder()

Creates and returns a new TextEncoder.

The TextEncoder interface doesn't inherit any properties.

TextEncoder.encoding Read only

Always returns utf-8.

The TextEncoder interface doesn't inherit any methods.

TextEncoder.encode()

Takes a string as input, and returns a Uint8Array containing the string encoded using UTF-8.

TextEncoder.encodeInto()

Takes a string to encode and a destination Uint8Array to put the resulting UTF-8 encoded text into, and returns an object indicating the progress of the encoding. This is potentially more performant than the older encode() method.

This example shows how to encode the "€" character to UTF-8.

<button id="encode">Encode</button>
<button id="reset">Reset</button>
<div id="output"></div>

const utf8encoder = new TextEncoder();
const text = "€";

const output = document.querySelector("#output");
const encodeButton = document.querySelector("#encode");
encodeButton.addEventListener("click", () => {
  output.textContent = utf8encoder.encode(text);
});

const resetButton = document.querySelector("#reset");
resetButton.addEventListener("click", () => {
  window.location.reload();
});

• The TextDecoder interface describing the inverse operation.

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HTML: 3.2 | Encoding: UTF-8 | Version: 0.7.4