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) {
    let result = '';
    const characters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
    const charactersLength = characters.length;
    let counter = 0;
    while (counter < length) {
      result += characters.charAt(Math.floor(Math.random() * charactersLength));
      counter += 1;
    }
    return result;
}

console.log(makeid(5));