Hello @Surbhi Srivasta 

function toUTF8Array(str) {
    var utf8 = [];
    for (var i=0; i < str.length; i++) {
        var charcode = str.charCodeAt(i);
        if (charcode < 0x80) utf8.push(charcode);
        else if (charcode < 0x800) {
            utf8.push(0xc0 | (charcode >> 6), 
                      0x80 | (charcode & 0x3f));
        }
        else if (charcode < 0xd800 || charcode >= 0xe000) {
            utf8.push(0xe0 | (charcode >> 12), 
                      0x80 | ((charcode>>6) & 0x3f), 
                      0x80 | (charcode & 0x3f));
        }
        else {
            // let's keep things simple and only handle chars up to U+FFFF...
            utf8.push(0xef, 0xbf, 0xbd); // U+FFFE "replacement character"
        }
    }
    return utf8;
}

Plz Mark my Solution as Accept and Give me thumbs up, if you find it Helpful.

Regards,

Samaksh