Случайный код JS
function makeid(length) {
var result = [];
var characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
var charactersLength = characters.length;
for ( var i = 0; i < length; i++ ) {
result.push(characters.charAt(Math.floor(Math.random() *
charactersLength)));
}
return result.join('');
}
console.log(makeid(5)); //Generate random string/characters.
Pudochu