TextDecoder.decode()

decode()
decode(buffer)
decode(buffer, options)

<p>Encoded value: <span id="encoded-value"></span></p>
<p>Decoded value: <span id="decoded-value"></span></p>

const encoder = new TextEncoder();
const array = encoder.encode(""); // Uint8Array(3) [226, 130, 172]
document.getElementById("encoded-value").textContent = array;

const decoder = new TextDecoder();
const str = decoder.decode(array); // String ""
document.getElementById("decoded-value").textContent = str;