String.prototype.toUTF8Array() Returns a string as an array of UTF8 code values. let str = "abcㄱㄴㄷ😻"; let arr = str.toUTF8Array(); console.log(arr); /* [ 97, 98, 99, 227, 132, 177, 227, 132, 180, 227, 132, 183, 240, 159, 152, 187 ] */