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TextDecoder :

let decoder = new TextDecoder([label], [options]);

label utf-8 big5, windows-1251
options :
- fatal boolean, true () \uFFFD
- ignoreBOM boolean, true BOM ()

let str = decoder.decode([input], [options]);

input BufferSource
options :
- stream decoder true TextDecoder

let uint8Array = new Uint8Array([72, 101, 108, 108, 111]);

alert( new TextDecoder().decode(uint8Array) ); // Hello

let uint8Array = new Uint8Array([228, 189, 160, 229, 165, 189]);

alert( new TextDecoder().decode(uint8Array) ); //

(subarray):

let uint8Array = new Uint8Array([0, 72, 101, 108, 108, 111, 0]);

// 
// 
let binaryString = uint8Array.subarray(1, -1);

alert( new TextDecoder().decode(binaryString) ); // Hello

TextEncoder

let encoder = new TextEncoder();

utf-8

encode(str) Uint8Array
encodeInto(str, destination) str destination destination Uint8Array

let encoder = new TextEncoder();

let uint8Array = encoder.encode("Hello");
alert(uint8Array); // 72,101,108,108,111

TextDecoder TextEncoder

TextEncoder