JavaScript HEX encoding

hex.js

function toHex(s) {
    // utf8 to latin1
    var s = unescape(encodeURIComponent(s))
    var h = ''
    for (var i = 0; i < s.length; i++) {
        h += s.charCodeAt(i).toString(16)
    }
    return h
}

function fromHex(h) {
    var s = ''
    for (var i = 0; i < h.length; i+=2) {
        s += String.fromCharCode(parseInt(h.substr(i, 2), 16))
    }
    return decodeURIComponent(escape(s))
}

> h = 'hello 🤣';
'hello 🤣'
> const encoded = Buffer.from(h).toString('hex');
undefined
> encoded
'68656c6c6f20f09fa4a3'
> Buffer.from(encoded, 'hex').toString();
'hello 🤣'
> 

@MGF15 that's only possible in NodeJS, this Gist is portable

Actually, this Gist is also not portable between environments. My bad