javascriptstringrandom

Generate a string of random characters

I want a string of fixed length, composed of characters picked randomly from a set of characters e.g. [a-zA-Z0-9].

How can I do this with JavaScript?

Solution

  • I think this will work for you:

    function makeid(length) {
    var result           = '';
    var characters       = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
    var charactersLength = characters.length;
    for ( var i = 0; i < length; i++ ) {
        result += characters.charAt(Math.floor(Math.random() * charactersLength));
    }
    return result;
}

console.log(makeid(5));